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[PATCH v5 6/7] Row pattern recognition patch (tests).
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* [PATCH v5 6/7] Row pattern recognition patch (tests).
@ 2023-09-02 06:32  Tatsuo Ishii <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Tatsuo Ishii @ 2023-09-02 06:32 UTC (permalink / raw)

---
 src/test/regress/expected/rpr.out  | 463 +++++++++++++++++++++++++++++
 src/test/regress/parallel_schedule |   2 +-
 src/test/regress/sql/rpr.sql       | 229 ++++++++++++++
 3 files changed, 693 insertions(+), 1 deletion(-)
 create mode 100644 src/test/regress/expected/rpr.out
 create mode 100644 src/test/regress/sql/rpr.sql

diff --git a/src/test/regress/expected/rpr.out b/src/test/regress/expected/rpr.out
new file mode 100644
index 0000000000..340ccf242c
--- /dev/null
+++ b/src/test/regress/expected/rpr.out
@@ -0,0 +1,463 @@
+--
+-- Test for row pattern definition clause
+--
+CREATE TEMP TABLE stock (
+       company TEXT,
+       tdate DATE,
+       price INTEGER
+       	       );
+INSERT INTO stock VALUES ('company1', '2023-07-01', 100);
+INSERT INTO stock VALUES ('company1', '2023-07-02', 200);
+INSERT INTO stock VALUES ('company1', '2023-07-03', 150);
+INSERT INTO stock VALUES ('company1', '2023-07-04', 140);
+INSERT INTO stock VALUES ('company1', '2023-07-05', 150);
+INSERT INTO stock VALUES ('company1', '2023-07-06', 90);
+INSERT INTO stock VALUES ('company1', '2023-07-07', 110);
+INSERT INTO stock VALUES ('company1', '2023-07-08', 130);
+INSERT INTO stock VALUES ('company1', '2023-07-09', 120);
+INSERT INTO stock VALUES ('company1', '2023-07-10', 130);
+INSERT INTO stock VALUES ('company2', '2023-07-01', 50);
+INSERT INTO stock VALUES ('company2', '2023-07-02', 2000);
+INSERT INTO stock VALUES ('company2', '2023-07-03', 1500);
+INSERT INTO stock VALUES ('company2', '2023-07-04', 1400);
+INSERT INTO stock VALUES ('company2', '2023-07-05', 1500);
+INSERT INTO stock VALUES ('company2', '2023-07-06', 60);
+INSERT INTO stock VALUES ('company2', '2023-07-07', 1100);
+INSERT INTO stock VALUES ('company2', '2023-07-08', 1300);
+INSERT INTO stock VALUES ('company2', '2023-07-09', 1200);
+INSERT INTO stock VALUES ('company2', '2023-07-10', 1300);
+SELECT * FROM stock;
+ company  |   tdate    | price 
+----------+------------+-------
+ company1 | 07-01-2023 |   100
+ company1 | 07-02-2023 |   200
+ company1 | 07-03-2023 |   150
+ company1 | 07-04-2023 |   140
+ company1 | 07-05-2023 |   150
+ company1 | 07-06-2023 |    90
+ company1 | 07-07-2023 |   110
+ company1 | 07-08-2023 |   130
+ company1 | 07-09-2023 |   120
+ company1 | 07-10-2023 |   130
+ company2 | 07-01-2023 |    50
+ company2 | 07-02-2023 |  2000
+ company2 | 07-03-2023 |  1500
+ company2 | 07-04-2023 |  1400
+ company2 | 07-05-2023 |  1500
+ company2 | 07-06-2023 |    60
+ company2 | 07-07-2023 |  1100
+ company2 | 07-08-2023 |  1300
+ company2 | 07-09-2023 |  1200
+ company2 | 07-10-2023 |  1300
+(20 rows)
+
+-- basic test using PREV
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w,
+ nth_value(tdate, 2) OVER w AS nth_second
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+ company  |   tdate    | price | first_value | last_value | nth_second 
+----------+------------+-------+-------------+------------+------------
+ company1 | 07-01-2023 |   100 |         100 |        140 | 07-02-2023
+ company1 | 07-02-2023 |   200 |             |            | 
+ company1 | 07-03-2023 |   150 |             |            | 
+ company1 | 07-04-2023 |   140 |             |            | 
+ company1 | 07-05-2023 |   150 |             |            | 
+ company1 | 07-06-2023 |    90 |          90 |        120 | 07-07-2023
+ company1 | 07-07-2023 |   110 |             |            | 
+ company1 | 07-08-2023 |   130 |             |            | 
+ company1 | 07-09-2023 |   120 |             |            | 
+ company1 | 07-10-2023 |   130 |             |            | 
+ company2 | 07-01-2023 |    50 |          50 |       1400 | 07-02-2023
+ company2 | 07-02-2023 |  2000 |             |            | 
+ company2 | 07-03-2023 |  1500 |             |            | 
+ company2 | 07-04-2023 |  1400 |             |            | 
+ company2 | 07-05-2023 |  1500 |             |            | 
+ company2 | 07-06-2023 |    60 |          60 |       1200 | 07-07-2023
+ company2 | 07-07-2023 |  1100 |             |            | 
+ company2 | 07-08-2023 |  1300 |             |            | 
+ company2 | 07-09-2023 |  1200 |             |            | 
+ company2 | 07-10-2023 |  1300 |             |            | 
+(20 rows)
+
+-- omit "START" in DEFINE but it is ok because "START AS TRUE" is
+-- implicitly defined. per spec.
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w,
+ nth_value(tdate, 2) OVER w AS nth_second
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+ company  |   tdate    | price | first_value | last_value | nth_second 
+----------+------------+-------+-------------+------------+------------
+ company1 | 07-01-2023 |   100 |         100 |        140 | 07-02-2023
+ company1 | 07-02-2023 |   200 |             |            | 
+ company1 | 07-03-2023 |   150 |             |            | 
+ company1 | 07-04-2023 |   140 |             |            | 
+ company1 | 07-05-2023 |   150 |             |            | 
+ company1 | 07-06-2023 |    90 |          90 |        120 | 07-07-2023
+ company1 | 07-07-2023 |   110 |             |            | 
+ company1 | 07-08-2023 |   130 |             |            | 
+ company1 | 07-09-2023 |   120 |             |            | 
+ company1 | 07-10-2023 |   130 |             |            | 
+ company2 | 07-01-2023 |    50 |          50 |       1400 | 07-02-2023
+ company2 | 07-02-2023 |  2000 |             |            | 
+ company2 | 07-03-2023 |  1500 |             |            | 
+ company2 | 07-04-2023 |  1400 |             |            | 
+ company2 | 07-05-2023 |  1500 |             |            | 
+ company2 | 07-06-2023 |    60 |          60 |       1200 | 07-07-2023
+ company2 | 07-07-2023 |  1100 |             |            | 
+ company2 | 07-08-2023 |  1300 |             |            | 
+ company2 | 07-09-2023 |  1200 |             |            | 
+ company2 | 07-10-2023 |  1300 |             |            | 
+(20 rows)
+
+-- the first row start with less than or equal to 100
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (LOWPRICE UP+ DOWN+)
+ DEFINE
+  LOWPRICE AS price <= 100,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+ company  |   tdate    | price | first_value | last_value 
+----------+------------+-------+-------------+------------
+ company1 | 07-01-2023 |   100 |         100 |        140
+ company1 | 07-02-2023 |   200 |             |           
+ company1 | 07-03-2023 |   150 |             |           
+ company1 | 07-04-2023 |   140 |             |           
+ company1 | 07-05-2023 |   150 |             |           
+ company1 | 07-06-2023 |    90 |          90 |        120
+ company1 | 07-07-2023 |   110 |             |           
+ company1 | 07-08-2023 |   130 |             |           
+ company1 | 07-09-2023 |   120 |             |           
+ company1 | 07-10-2023 |   130 |             |           
+ company2 | 07-01-2023 |    50 |          50 |       1400
+ company2 | 07-02-2023 |  2000 |             |           
+ company2 | 07-03-2023 |  1500 |             |           
+ company2 | 07-04-2023 |  1400 |             |           
+ company2 | 07-05-2023 |  1500 |             |           
+ company2 | 07-06-2023 |    60 |          60 |       1200
+ company2 | 07-07-2023 |  1100 |             |           
+ company2 | 07-08-2023 |  1300 |             |           
+ company2 | 07-09-2023 |  1200 |             |           
+ company2 | 07-10-2023 |  1300 |             |           
+(20 rows)
+
+-- second row raises 120%
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (LOWPRICE UP+ DOWN+)
+ DEFINE
+  LOWPRICE AS price <= 100,
+  UP AS price > PREV(price) * 1.2,
+  DOWN AS price < PREV(price)
+);
+ company  |   tdate    | price | first_value | last_value 
+----------+------------+-------+-------------+------------
+ company1 | 07-01-2023 |   100 |         100 |        140
+ company1 | 07-02-2023 |   200 |             |           
+ company1 | 07-03-2023 |   150 |             |           
+ company1 | 07-04-2023 |   140 |             |           
+ company1 | 07-05-2023 |   150 |             |           
+ company1 | 07-06-2023 |    90 |             |           
+ company1 | 07-07-2023 |   110 |             |           
+ company1 | 07-08-2023 |   130 |             |           
+ company1 | 07-09-2023 |   120 |             |           
+ company1 | 07-10-2023 |   130 |             |           
+ company2 | 07-01-2023 |    50 |          50 |       1400
+ company2 | 07-02-2023 |  2000 |             |           
+ company2 | 07-03-2023 |  1500 |             |           
+ company2 | 07-04-2023 |  1400 |             |           
+ company2 | 07-05-2023 |  1500 |             |           
+ company2 | 07-06-2023 |    60 |             |           
+ company2 | 07-07-2023 |  1100 |             |           
+ company2 | 07-08-2023 |  1300 |             |           
+ company2 | 07-09-2023 |  1200 |             |           
+ company2 | 07-10-2023 |  1300 |             |           
+(20 rows)
+
+-- using NEXT
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UPDOWN)
+ DEFINE
+  START AS TRUE,
+  UPDOWN AS price > PREV(price) AND price > NEXT(price)
+);
+ company  |   tdate    | price | first_value | last_value 
+----------+------------+-------+-------------+------------
+ company1 | 07-01-2023 |   100 |         100 |        200
+ company1 | 07-02-2023 |   200 |             |           
+ company1 | 07-03-2023 |   150 |             |           
+ company1 | 07-04-2023 |   140 |         140 |        150
+ company1 | 07-05-2023 |   150 |             |           
+ company1 | 07-06-2023 |    90 |             |           
+ company1 | 07-07-2023 |   110 |         110 |        130
+ company1 | 07-08-2023 |   130 |             |           
+ company1 | 07-09-2023 |   120 |             |           
+ company1 | 07-10-2023 |   130 |             |           
+ company2 | 07-01-2023 |    50 |          50 |       2000
+ company2 | 07-02-2023 |  2000 |             |           
+ company2 | 07-03-2023 |  1500 |             |           
+ company2 | 07-04-2023 |  1400 |        1400 |       1500
+ company2 | 07-05-2023 |  1500 |             |           
+ company2 | 07-06-2023 |    60 |             |           
+ company2 | 07-07-2023 |  1100 |        1100 |       1300
+ company2 | 07-08-2023 |  1300 |             |           
+ company2 | 07-09-2023 |  1200 |             |           
+ company2 | 07-10-2023 |  1300 |             |           
+(20 rows)
+
+-- using AFTER MATCH SKIP TO NEXT ROW
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP TO NEXT ROW
+ INITIAL
+ PATTERN (START UPDOWN)
+ DEFINE
+  START AS TRUE,
+  UPDOWN AS price > PREV(price) AND price > NEXT(price)
+);
+ company  |   tdate    | price | first_value | last_value 
+----------+------------+-------+-------------+------------
+ company1 | 07-01-2023 |   100 |         100 |        200
+ company1 | 07-02-2023 |   200 |             |           
+ company1 | 07-03-2023 |   150 |             |           
+ company1 | 07-04-2023 |   140 |         140 |        150
+ company1 | 07-05-2023 |   150 |             |           
+ company1 | 07-06-2023 |    90 |             |           
+ company1 | 07-07-2023 |   110 |         110 |        130
+ company1 | 07-08-2023 |   130 |             |           
+ company1 | 07-09-2023 |   120 |             |           
+ company1 | 07-10-2023 |   130 |             |           
+ company2 | 07-01-2023 |    50 |          50 |       2000
+ company2 | 07-02-2023 |  2000 |             |           
+ company2 | 07-03-2023 |  1500 |             |           
+ company2 | 07-04-2023 |  1400 |        1400 |       1500
+ company2 | 07-05-2023 |  1500 |             |           
+ company2 | 07-06-2023 |    60 |             |           
+ company2 | 07-07-2023 |  1100 |        1100 |       1300
+ company2 | 07-08-2023 |  1300 |             |           
+ company2 | 07-09-2023 |  1200 |             |           
+ company2 | 07-10-2023 |  1300 |             |           
+(20 rows)
+
+-- match everything
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP PAST LAST ROW
+ INITIAL
+ PATTERN (A+)
+ DEFINE
+  A AS TRUE
+);
+ company  |   tdate    | price | first_value | last_value 
+----------+------------+-------+-------------+------------
+ company1 | 07-01-2023 |   100 |         100 |        130
+ company1 | 07-02-2023 |   200 |             |           
+ company1 | 07-03-2023 |   150 |             |           
+ company1 | 07-04-2023 |   140 |             |           
+ company1 | 07-05-2023 |   150 |             |           
+ company1 | 07-06-2023 |    90 |             |           
+ company1 | 07-07-2023 |   110 |             |           
+ company1 | 07-08-2023 |   130 |             |           
+ company1 | 07-09-2023 |   120 |             |           
+ company1 | 07-10-2023 |   130 |             |           
+ company2 | 07-01-2023 |    50 |          50 |       1300
+ company2 | 07-02-2023 |  2000 |             |           
+ company2 | 07-03-2023 |  1500 |             |           
+ company2 | 07-04-2023 |  1400 |             |           
+ company2 | 07-05-2023 |  1500 |             |           
+ company2 | 07-06-2023 |    60 |             |           
+ company2 | 07-07-2023 |  1100 |             |           
+ company2 | 07-08-2023 |  1300 |             |           
+ company2 | 07-09-2023 |  1200 |             |           
+ company2 | 07-10-2023 |  1300 |             |           
+(20 rows)
+
+-- backtracking with reclassification of rows
+-- using AFTER MATCH SKIP PAST LAST ROW
+SELECT company, tdate, price, first_value(tdate) OVER w, last_value(tdate) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP PAST LAST ROW
+ INITIAL
+ PATTERN (A+ B+)
+ DEFINE
+  A AS price > 100,
+  B AS price > 100
+);
+ company  |   tdate    | price | first_value | last_value 
+----------+------------+-------+-------------+------------
+ company1 | 07-01-2023 |   100 |             | 
+ company1 | 07-02-2023 |   200 | 07-02-2023  | 07-05-2023
+ company1 | 07-03-2023 |   150 |             | 
+ company1 | 07-04-2023 |   140 |             | 
+ company1 | 07-05-2023 |   150 |             | 
+ company1 | 07-06-2023 |    90 |             | 
+ company1 | 07-07-2023 |   110 | 07-07-2023  | 07-10-2023
+ company1 | 07-08-2023 |   130 |             | 
+ company1 | 07-09-2023 |   120 |             | 
+ company1 | 07-10-2023 |   130 |             | 
+ company2 | 07-01-2023 |    50 |             | 
+ company2 | 07-02-2023 |  2000 | 07-02-2023  | 07-05-2023
+ company2 | 07-03-2023 |  1500 |             | 
+ company2 | 07-04-2023 |  1400 |             | 
+ company2 | 07-05-2023 |  1500 |             | 
+ company2 | 07-06-2023 |    60 |             | 
+ company2 | 07-07-2023 |  1100 | 07-07-2023  | 07-10-2023
+ company2 | 07-08-2023 |  1300 |             | 
+ company2 | 07-09-2023 |  1200 |             | 
+ company2 | 07-10-2023 |  1300 |             | 
+(20 rows)
+
+-- backtracking with reclassification of rows
+-- using AFTER MATCH SKIP TO NEXT ROW
+SELECT company, tdate, price, first_value(tdate) OVER w, last_value(tdate) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP TO NEXT ROW
+ INITIAL
+ PATTERN (A+ B+)
+ DEFINE
+  A AS price > 100,
+  B AS price > 100
+);
+ company  |   tdate    | price | first_value | last_value 
+----------+------------+-------+-------------+------------
+ company1 | 07-01-2023 |   100 |             | 
+ company1 | 07-02-2023 |   200 | 07-02-2023  | 07-05-2023
+ company1 | 07-03-2023 |   150 | 07-03-2023  | 07-05-2023
+ company1 | 07-04-2023 |   140 | 07-04-2023  | 07-05-2023
+ company1 | 07-05-2023 |   150 |             | 
+ company1 | 07-06-2023 |    90 |             | 
+ company1 | 07-07-2023 |   110 | 07-07-2023  | 07-10-2023
+ company1 | 07-08-2023 |   130 | 07-08-2023  | 07-10-2023
+ company1 | 07-09-2023 |   120 | 07-09-2023  | 07-10-2023
+ company1 | 07-10-2023 |   130 |             | 
+ company2 | 07-01-2023 |    50 |             | 
+ company2 | 07-02-2023 |  2000 | 07-02-2023  | 07-05-2023
+ company2 | 07-03-2023 |  1500 | 07-03-2023  | 07-05-2023
+ company2 | 07-04-2023 |  1400 | 07-04-2023  | 07-05-2023
+ company2 | 07-05-2023 |  1500 |             | 
+ company2 | 07-06-2023 |    60 |             | 
+ company2 | 07-07-2023 |  1100 | 07-07-2023  | 07-10-2023
+ company2 | 07-08-2023 |  1300 | 07-08-2023  | 07-10-2023
+ company2 | 07-09-2023 |  1200 | 07-09-2023  | 07-10-2023
+ company2 | 07-10-2023 |  1300 |             | 
+(20 rows)
+
+--
+-- Error cases
+--
+-- row pattern definition variable name must not appear more than once
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ ORDER BY tdate
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price),
+  UP AS price > PREV(price)
+);
+ERROR:  syntax error at or near "ORDER"
+LINE 6:  ORDER BY tdate
+         ^
+-- pattern variable name must appear in DEFINE
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+ END)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+ERROR:  syntax error at or near "END"
+LINE 8:  PATTERN (START UP+ DOWN+ END)
+                                  ^
+-- FRAME must start at current row when row patttern recognition is used
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+ERROR:  FRAME must start at current row when row patttern recognition is used
+-- SEEK is not supported
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP TO NEXT ROW
+ SEEK
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+ERROR:  SEEK is not supported
+LINE 8:  SEEK
+         ^
+HINT:  Use INITIAL.
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index 4df9d8503b..896531002b 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -98,7 +98,7 @@ test: publication subscription
 # Another group of parallel tests
 # select_views depends on create_view
 # ----------
-test: select_views portals_p2 foreign_key cluster dependency guc bitmapops combocid tsearch tsdicts foreign_data window xmlmap functional_deps advisory_lock indirect_toast equivclass
+test: select_views portals_p2 foreign_key cluster dependency guc bitmapops combocid tsearch tsdicts foreign_data window xmlmap functional_deps advisory_lock indirect_toast equivclass rpr
 
 # ----------
 # Another group of parallel tests (JSON related)
diff --git a/src/test/regress/sql/rpr.sql b/src/test/regress/sql/rpr.sql
new file mode 100644
index 0000000000..c4f704cdc4
--- /dev/null
+++ b/src/test/regress/sql/rpr.sql
@@ -0,0 +1,229 @@
+--
+-- Test for row pattern definition clause
+--
+
+CREATE TEMP TABLE stock (
+       company TEXT,
+       tdate DATE,
+       price INTEGER
+       	       );
+INSERT INTO stock VALUES ('company1', '2023-07-01', 100);
+INSERT INTO stock VALUES ('company1', '2023-07-02', 200);
+INSERT INTO stock VALUES ('company1', '2023-07-03', 150);
+INSERT INTO stock VALUES ('company1', '2023-07-04', 140);
+INSERT INTO stock VALUES ('company1', '2023-07-05', 150);
+INSERT INTO stock VALUES ('company1', '2023-07-06', 90);
+INSERT INTO stock VALUES ('company1', '2023-07-07', 110);
+INSERT INTO stock VALUES ('company1', '2023-07-08', 130);
+INSERT INTO stock VALUES ('company1', '2023-07-09', 120);
+INSERT INTO stock VALUES ('company1', '2023-07-10', 130);
+INSERT INTO stock VALUES ('company2', '2023-07-01', 50);
+INSERT INTO stock VALUES ('company2', '2023-07-02', 2000);
+INSERT INTO stock VALUES ('company2', '2023-07-03', 1500);
+INSERT INTO stock VALUES ('company2', '2023-07-04', 1400);
+INSERT INTO stock VALUES ('company2', '2023-07-05', 1500);
+INSERT INTO stock VALUES ('company2', '2023-07-06', 60);
+INSERT INTO stock VALUES ('company2', '2023-07-07', 1100);
+INSERT INTO stock VALUES ('company2', '2023-07-08', 1300);
+INSERT INTO stock VALUES ('company2', '2023-07-09', 1200);
+INSERT INTO stock VALUES ('company2', '2023-07-10', 1300);
+
+SELECT * FROM stock;
+
+-- basic test using PREV
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w,
+ nth_value(tdate, 2) OVER w AS nth_second
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+
+-- omit "START" in DEFINE but it is ok because "START AS TRUE" is
+-- implicitly defined. per spec.
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w,
+ nth_value(tdate, 2) OVER w AS nth_second
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+
+-- the first row start with less than or equal to 100
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (LOWPRICE UP+ DOWN+)
+ DEFINE
+  LOWPRICE AS price <= 100,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+
+-- second row raises 120%
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (LOWPRICE UP+ DOWN+)
+ DEFINE
+  LOWPRICE AS price <= 100,
+  UP AS price > PREV(price) * 1.2,
+  DOWN AS price < PREV(price)
+);
+
+-- using NEXT
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UPDOWN)
+ DEFINE
+  START AS TRUE,
+  UPDOWN AS price > PREV(price) AND price > NEXT(price)
+);
+
+-- using AFTER MATCH SKIP TO NEXT ROW
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP TO NEXT ROW
+ INITIAL
+ PATTERN (START UPDOWN)
+ DEFINE
+  START AS TRUE,
+  UPDOWN AS price > PREV(price) AND price > NEXT(price)
+);
+
+-- match everything
+
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP PAST LAST ROW
+ INITIAL
+ PATTERN (A+)
+ DEFINE
+  A AS TRUE
+);
+
+-- backtracking with reclassification of rows
+-- using AFTER MATCH SKIP PAST LAST ROW
+SELECT company, tdate, price, first_value(tdate) OVER w, last_value(tdate) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP PAST LAST ROW
+ INITIAL
+ PATTERN (A+ B+)
+ DEFINE
+  A AS price > 100,
+  B AS price > 100
+);
+
+-- backtracking with reclassification of rows
+-- using AFTER MATCH SKIP TO NEXT ROW
+SELECT company, tdate, price, first_value(tdate) OVER w, last_value(tdate) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP TO NEXT ROW
+ INITIAL
+ PATTERN (A+ B+)
+ DEFINE
+  A AS price > 100,
+  B AS price > 100
+);
+
+--
+-- Error cases
+--
+
+-- row pattern definition variable name must not appear more than once
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ ORDER BY tdate
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price),
+  UP AS price > PREV(price)
+);
+
+-- pattern variable name must appear in DEFINE
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+ END)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+
+-- FRAME must start at current row when row patttern recognition is used
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
+ INITIAL
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
+
+-- SEEK is not supported
+SELECT company, tdate, price, first_value(price) OVER w, last_value(price) OVER w
+ FROM stock
+ WINDOW w AS (
+ PARTITION BY company
+ ORDER BY tdate
+ ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING
+ AFTER MATCH SKIP TO NEXT ROW
+ SEEK
+ PATTERN (START UP+ DOWN+)
+ DEFINE
+  START AS TRUE,
+  UP AS price > PREV(price),
+  DOWN AS price < PREV(price)
+);
-- 
2.25.1


----Next_Part(Sat_Sep__2_15_52_35_2023_273)--
Content-Type: Text/X-Patch; charset=us-ascii
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="v5-0007-Allow-to-print-raw-parse-tree.patch"



^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread

* [PATCH] Reproduce filtering issue.
@ 2026-03-23 11:50  Antonin Houska <[email protected]>
  0 siblings, 0 replies; 966+ messages in thread

From: Antonin Houska @ 2026-03-23 11:50 UTC (permalink / raw)

---
 contrib/test_decoding/expected/filtering.out |  74 ++++++++++++++
 contrib/test_decoding/specs/filtering.spec   | 101 +++++++++++++++++++
 src/backend/executor/nodeModifyTable.c       |   2 +
 src/backend/replication/logical/snapbuild.c  |   3 +
 src/test/isolation/isolationtester.c         |   9 +-
 5 files changed, 188 insertions(+), 1 deletion(-)
 create mode 100644 contrib/test_decoding/expected/filtering.out
 create mode 100644 contrib/test_decoding/specs/filtering.spec

diff --git a/contrib/test_decoding/expected/filtering.out b/contrib/test_decoding/expected/filtering.out
new file mode 100644
index 00000000000..6ba9690509f
--- /dev/null
+++ b/contrib/test_decoding/expected/filtering.out
@@ -0,0 +1,74 @@
+Parsed test spec with 5 sessions
+
+starting permutation: s1_assign_xid s3_repack s2_assign_xid s1_rollback s4_insert s5_wakeup_snapbuild s2_rollback s5_wakeup_insert_speculative s4_insert_commit s5_wakeup_repack
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+injection_points_attach
+-----------------------
+                       
+(1 row)
+
+step s1_assign_xid: 
+    BEGIN;
+    CREATE TABLE c(i int);
+
+step s3_repack: 
+	REPACK (CONCURRENTLY) a;
+ <waiting ...>
+step s2_assign_xid: 
+    BEGIN;
+    CREATE TABLE d(i int);
+
+step s1_rollback: 
+    ROLLBACK;
+
+step s4_insert: 
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+ <waiting ...>
+step s5_wakeup_snapbuild: 
+	SELECT injection_points_wakeup('snapbuild-full');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s2_rollback: 
+    ROLLBACK;
+
+step s5_wakeup_insert_speculative: 
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s4_insert: <... completed>
+step s4_insert_commit: 
+	COMMIT;
+
+step s5_wakeup_repack: 
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+
+injection_points_wakeup
+-----------------------
+                       
+(1 row)
+
+step s3_repack: <... completed>
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
+injection_points_detach
+-----------------------
+                       
+(1 row)
+
diff --git a/contrib/test_decoding/specs/filtering.spec b/contrib/test_decoding/specs/filtering.spec
new file mode 100644
index 00000000000..a02c9f8facb
--- /dev/null
+++ b/contrib/test_decoding/specs/filtering.spec
@@ -0,0 +1,101 @@
+setup
+{
+	CREATE TABLE a(i int primary key, j int) WITH (autovacuum_enabled = off);
+	INSERT INTO a(i, j) VALUES (1, 1), (2, 2);
+	CREATE TABLE t(i int primary key);
+	INSERT INTO t(i) VALUES (1);
+	CREATE EXTENSION injection_points;
+}
+
+session s1
+step s1_assign_xid
+{
+    BEGIN;
+    CREATE TABLE c(i int);
+}
+step s1_rollback
+{
+    ROLLBACK;
+}
+
+session s2
+step s2_assign_xid
+{
+    BEGIN;
+    CREATE TABLE d(i int);
+}
+step s2_rollback
+{
+    ROLLBACK;
+}
+
+session s3
+setup
+{
+	SELECT injection_points_attach('snapbuild-full', 'wait');
+	SELECT injection_points_attach('repack-concurrently-before-lock', 'wait');
+}
+step s3_repack
+{
+	REPACK (CONCURRENTLY) a;
+}
+teardown
+{
+	SELECT injection_points_detach('repack-concurrently-before-lock');
+	SELECT injection_points_detach('snapbuild-full');
+}
+
+session s4
+setup
+{
+	SELECT injection_points_set_local();
+	SELECT injection_points_attach('insert-speculative-before-confirm', 'wait');
+}
+step s4_insert
+{
+	BEGIN;
+	INSERT INTO t(i)
+	SELECT max(i) + 1 FROM t ON CONFLICT (i) DO UPDATE SET i=EXCLUDED.i;
+}
+step s4_insert_commit
+{
+	COMMIT;
+}
+teardown
+{
+	SELECT injection_points_detach('insert-speculative-before-confirm');
+}
+
+session s5
+step s5_wakeup_snapbuild
+{
+	SELECT injection_points_wakeup('snapbuild-full');
+}
+step s5_wakeup_insert_speculative
+{
+	SELECT injection_points_wakeup('insert-speculative-before-confirm');
+}
+step s5_wakeup_repack
+{
+	SELECT injection_points_wakeup('repack-concurrently-before-lock');
+}
+
+permutation
+# Bring the snapshot builder to the FULL_SNAPSHOT state.
+s1_assign_xid
+s3_repack
+s2_assign_xid
+s1_rollback
+# Perform the speculative insert, but no confirmation so far. The snapshot
+# builder should decode it.
+s4_insert
+# Let the snapshout builder achieve CONSISTENT state and finish the setup.
+s5_wakeup_snapbuild
+s2_rollback
+# While REPACK is waiting on repack-concurrently-before-lock, let the insert
+# get confirmed. Relation filtering is now enabled.
+s5_wakeup_insert_speculative
+s4_insert_commit
+# REPACK should now decode the speculative insert and decode the speculative
+# insert (with the confirmation record filtered out).
+s5_wakeup_repack
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index 680c29f35d5..6d5482e5746 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1232,6 +1232,8 @@ ExecInsert(ModifyTableContext *context,
 												   slot, arbiterIndexes,
 												   &specConflict);
 
+			INJECTION_POINT("insert-speculative-before-confirm", NULL);
+
 			/* adjust the tuple's state accordingly */
 			table_tuple_complete_speculative(resultRelationDesc, slot,
 											 specToken, !specConflict);
diff --git a/src/backend/replication/logical/snapbuild.c b/src/backend/replication/logical/snapbuild.c
index fbdd4600a2b..883e5b6e18f 100644
--- a/src/backend/replication/logical/snapbuild.c
+++ b/src/backend/replication/logical/snapbuild.c
@@ -141,6 +141,7 @@
 #include "storage/procarray.h"
 #include "storage/standby.h"
 #include "utils/builtins.h"
+#include "utils/injection_point.h"
 #include "utils/memutils.h"
 #include "utils/snapmgr.h"
 #include "utils/snapshot.h"
@@ -1390,6 +1391,8 @@ SnapBuildFindSnapshot(SnapBuild *builder, XLogRecPtr lsn, xl_running_xacts *runn
 		builder->state = SNAPBUILD_FULL_SNAPSHOT;
 		builder->next_phase_at = running->nextXid;
 
+		INJECTION_POINT("snapbuild-full", NULL);
+
 		ereport(LOG,
 				errmsg("logical decoding found initial consistent point at %X/%08X",
 					   LSN_FORMAT_ARGS(lsn)),
diff --git a/src/test/isolation/isolationtester.c b/src/test/isolation/isolationtester.c
index 440c875b8ac..8f17ee412c9 100644
--- a/src/test/isolation/isolationtester.c
+++ b/src/test/isolation/isolationtester.c
@@ -216,15 +216,22 @@ main(int argc, char **argv)
 	 * exactly expect concurrent use of test tables.  However, autovacuum will
 	 * occasionally take AccessExclusiveLock to truncate a table, and we must
 	 * ignore that transient wait.
+	 *
+	 * If the session's backend is blocked, and if its background worker is
+	 * waiting on an injection point, we assume that the injection point is
+	 * the reason for the backend to be blocked. That's what we check in the
+	 * second query of the UNION. XXX Should we use a separate query for that?
 	 */
 	initPQExpBuffer(&wait_query);
 	appendPQExpBufferStr(&wait_query,
+						 "WITH blocking(res) AS ("
 						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked($1, '{");
 	/* The spec syntax requires at least one session; assume that here. */
 	appendPQExpBufferStr(&wait_query, conns[1].backend_pid_str);
 	for (i = 2; i < nconns; i++)
 		appendPQExpBuffer(&wait_query, ",%s", conns[i].backend_pid_str);
-	appendPQExpBufferStr(&wait_query, "}')");
+	appendPQExpBufferStr(&wait_query, "}') UNION "
+						 "SELECT pg_catalog.pg_isolation_test_session_is_blocked(pid, '{}') FROM pg_stat_activity WHERE leader_pid=$1) SELECT bool_or(res) FROM blocking");
 
 	res = PQprepare(conns[0].conn, PREP_WAITING, wait_query.data, 0, NULL);
 	if (PQresultStatus(res) != PGRES_COMMAND_OK)
-- 
2.47.3


--=-=-=--





^ permalink  raw  reply  [nested|flat] 966+ messages in thread