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Commitc82037e

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Fix grammar's AND/OR flattening to work with operator_precedence_warning.
It'd be good for "(x AND y) AND z" to produce a three-child AND nodewhether or not operator_precedence_warning is on, but that failed tohappen when it's on because makeAndExpr() didn't look through the addedAEXPR_PAREN node. This has no effect on generated plans because prepqual.cwould flatten the AND nest anyway; but it does affect the number of parensprinted in ruleutils.c, for example. I'd already fixed some similarhazards in parse_expr.c in commitabb1646, but didn't think to searchgram.y for problems of this ilk. Per gripe from Jean-Pierre Pelletier.Report: <fa0535ec6d6428cfec40c7e8a6d11156@mail.gmail.com>
1 parent8355897 commitc82037e

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1 file changed

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‎src/backend/parser/gram.y‎

Lines changed: 16 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -14512,10 +14512,16 @@ doNegateFloat(Value *v)
1451214512
static Node *
1451314513
makeAndExpr(Node *lexpr, Node *rexpr, int location)
1451414514
{
14515+
Node *lexp = lexpr;
14516+
14517+
/* Look through AEXPR_PAREN nodes so they don't affect flattening*/
14518+
while (IsA(lexp, A_Expr) &&
14519+
((A_Expr *) lexp)->kind == AEXPR_PAREN)
14520+
lexp = ((A_Expr *) lexp)->lexpr;
1451514521
/* Flatten "a AND b AND c ..." to a single BoolExpr on sight*/
14516-
if (IsA(lexpr, BoolExpr))
14522+
if (IsA(lexp, BoolExpr))
1451714523
{
14518-
BoolExpr *blexpr = (BoolExpr *)lexpr;
14524+
BoolExpr *blexpr = (BoolExpr *)lexp;
1451914525

1452014526
if (blexpr->boolop == AND_EXPR)
1452114527
{
@@ -14529,10 +14535,16 @@ makeAndExpr(Node *lexpr, Node *rexpr, int location)
1452914535
static Node *
1453014536
makeOrExpr(Node *lexpr, Node *rexpr, int location)
1453114537
{
14538+
Node *lexp = lexpr;
14539+
14540+
/* Look through AEXPR_PAREN nodes so they don't affect flattening*/
14541+
while (IsA(lexp, A_Expr) &&
14542+
((A_Expr *) lexp)->kind == AEXPR_PAREN)
14543+
lexp = ((A_Expr *) lexp)->lexpr;
1453214544
/* Flatten "a OR b OR c ..." to a single BoolExpr on sight*/
14533-
if (IsA(lexpr, BoolExpr))
14545+
if (IsA(lexp, BoolExpr))
1453414546
{
14535-
BoolExpr *blexpr = (BoolExpr *)lexpr;
14547+
BoolExpr *blexpr = (BoolExpr *)lexp;
1453614548

1453714549
if (blexpr->boolop == OR_EXPR)
1453814550
{

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