postgres.git / summary / log / commit / refs

commit    f627fd547a34bb3ffba5763a1ab404c2777debe4
Author:   Tom Lane <tgl@sss.pgh.pa.us>
Date:     Tue Oct 19 15:35:15 2021 +0000

    Remove bogus assertion in transformExpressionList().
    
    I think when I added this assertion (in commit 8f889b108), I was only
    thinking of the use of transformExpressionList at top level of INSERT
    and VALUES.  But it's also called by transformRowExpr(), which can
    certainly occur in an UPDATE targetlist, so it's inappropriate to
    suppose that p_multiassign_exprs must be empty.  Besides, since the
    input is not expected to contain ResTargets, there's no reason it
    should contain MultiAssignRefs either.  Hence this code need not
    be concerned about the state of p_multiassign_exprs, and we should
    just drop the assertion.
    
    Per bug #17236 from ocean_li_996.  It's been wrong for years,
    so back-patch to all supported branches.
    
    Discussion: https://postgr.es/m/17236-3210de9bcba1d7ca@postgresql.org


 src/backend/parser/parse_target.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/backend/parser/parse_target.c b/src/backend/parser/parse_target.c
index 6e8fbc47801..9ce3a0de961 100644
--- a/src/backend/parser/parse_target.c
+++ b/src/backend/parser/parse_target.c
@@ -211,7 +211,9 @@ transformTargetList(ParseState *pstate, List *targetlist,
  * This is the identical transformation to transformTargetList, except that
  * the input list elements are bare expressions without ResTarget decoration,
  * and the output elements are likewise just expressions without TargetEntry
- * decoration.  We use this for ROW() and VALUES() constructs.
+ * decoration.  Also, we don't expect any multiassign constructs within the
+ * list, so there's nothing to do for that.  We use this for ROW() and
+ * VALUES() constructs.
  *
  * exprKind is not enough to tell us whether to allow SetToDefault, so
  * an additional flag is needed for that.
@@ -273,9 +275,6 @@ transformExpressionList(ParseState *pstate, List *exprlist,
 		result = lappend(result, e);
 	}
 
-	/* Shouldn't have any multiassign items here */
-	Assert(pstate->p_multiassign_exprs == NIL);
-
 	return result;
 }
 


[parent: 3e2f32b01d3b]