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commit    4c51a2d1e4b750bc11b8de9a85b079a14f798741
Author:   Tom Lane <tgl@sss.pgh.pa.us>
Date:     Tue Sep 01 22:40:37 2020 +0000
First released in: 14.0

    Improve test coverage of ginvacuum.c.
    
    Add a test case that exercises vacuum's deletion of empty GIN
    posting pages.  Since this is a temp table, it should now work
    reliably to delete a bunch of rows and immediately VACUUM.
    Before the preceding commit, this would not have had the desired
    effect, at least not in parallel regression tests.
    
    Discussion: https://postgr.es/m/3490536.1598629609@sss.pgh.pa.us


 src/test/regress/expected/gin.out | 21 +++++++++++++++++++++
 src/test/regress/sql/gin.sql      |  8 ++++++++
 2 files changed, 29 insertions(+)

diff --git a/src/test/regress/expected/gin.out b/src/test/regress/expected/gin.out
index b335466fc4b..6402e89c7ff 100644
--- a/src/test/regress/expected/gin.out
+++ b/src/test/regress/expected/gin.out
@@ -264,6 +264,27 @@ select count(*) from t_gin_test_tbl where j @> '{}'::int[];
  20006
 (1 row)
 
+-- test vacuuming of posting trees
+delete from t_gin_test_tbl where j @> array[2];
+vacuum t_gin_test_tbl;
+select count(*) from t_gin_test_tbl where j @> array[50];
+ count 
+-------
+     0
+(1 row)
+
+select count(*) from t_gin_test_tbl where j @> array[2];
+ count 
+-------
+     0
+(1 row)
+
+select count(*) from t_gin_test_tbl where j @> '{}'::int[];
+ count 
+-------
+     6
+(1 row)
+
 reset enable_seqscan;
 reset enable_bitmapscan;
 drop table t_gin_test_tbl;
diff --git a/src/test/regress/sql/gin.sql b/src/test/regress/sql/gin.sql
index efb8ef3e964..5194afcc1f5 100644
--- a/src/test/regress/sql/gin.sql
+++ b/src/test/regress/sql/gin.sql
@@ -159,6 +159,14 @@ explain (costs off)
 select count(*) from t_gin_test_tbl where j @> '{}'::int[];
 select count(*) from t_gin_test_tbl where j @> '{}'::int[];
 
+-- test vacuuming of posting trees
+delete from t_gin_test_tbl where j @> array[2];
+vacuum t_gin_test_tbl;
+
+select count(*) from t_gin_test_tbl where j @> array[50];
+select count(*) from t_gin_test_tbl where j @> array[2];
+select count(*) from t_gin_test_tbl where j @> '{}'::int[];
+
 reset enable_seqscan;
 reset enable_bitmapscan;
 


[parent: a7212be8b9e0]