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Commitc02e52d

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Don't let transform_null_equals=on affect CASE foo WHEN NULL ... constructs.
transform_null_equals is only supposed to affect "foo = NULL" expressionsgiven directly by the user, not the internal "foo = NULL" expressiongenerated from CASE-WHEN.This fixes bug #6242, reported by Sergey. Backpatch to all supportedbranches.
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‎src/backend/parser/parse_expr.c

Lines changed: 5 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -830,12 +830,15 @@ transformAExprOp(ParseState *pstate, A_Expr *a)
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/*
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* Special-case "foo = NULL" and "NULL = foo" for compatibility with
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* standards-broken products (like Microsoft's). Turn these into IS NULL
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* exprs.
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* exprs. (If either side is a CaseTestExpr, then the expression was
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* generated internally from a CASE-WHEN expression, and
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* transform_null_equals does not apply.)
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*/
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if (Transform_null_equals&&
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list_length(a->name)==1&&
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strcmp(strVal(linitial(a->name)),"=")==0&&
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(exprIsNullConstant(lexpr)||exprIsNullConstant(rexpr)))
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(exprIsNullConstant(lexpr)||exprIsNullConstant(rexpr))&&
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(!IsA(lexpr,CaseTestExpr)&& !IsA(rexpr,CaseTestExpr)))
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{
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NullTest*n=makeNode(NullTest);
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