c82037e372
It'd be good for "(x AND y) AND z" to produce a three-child AND node whether or not operator_precedence_warning is on, but that failed to happen when it's on because makeAndExpr() didn't look through the added AEXPR_PAREN node. This has no effect on generated plans because prepqual.c would flatten the AND nest anyway; but it does affect the number of parens printed in ruleutils.c, for example. I'd already fixed some similar hazards in parse_expr.c in commit abb164655, but didn't think to search gram.y for problems of this ilk. Per gripe from Jean-Pierre Pelletier. Report: <fa0535ec6d6428cfec40c7e8a6d11156@mail.gmail.com>
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