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Fix estimate_expression_value to constant-fold SQLValueFunction nodes.

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Oversight in my commit 0bb51aa96.  Noted while poking at a recent
bug report --- HEAD's estimates for a query using CURRENT_DATE
were unexpectedly much worse than 9.6's.
This commit is contained in:
Tom Lane 2016-11-28 19:08:38 -05:00
parent eb68141688
commit 4e20511d5b
1 changed files with 17 additions and 0 deletions
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17
src/backend/optimizer/util/clauses.c
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@ -3346,6 +3346,23 @@ eval_const_expressions_mutator(Node *node,
newcoalesce->location = coalesceexpr->location;
return (Node *) newcoalesce;
}
case T_SQLValueFunction:
{
/*
* All variants of SQLValueFunction are stable, so if we are
* estimating the expression's value, we should evaluate the
* current function value. Otherwise just copy.
*/
SQLValueFunction *svf = (SQLValueFunction *) node;
if (context->estimate)
return (Node *) evaluate_expr((Expr *) svf,
svf->type,
svf->typmod,
InvalidOid);
else
return copyObject((Node *) svf);
}
case T_FieldSelect:
{
/*