b3e715a035
Such cases should work, but the grammar failed to accept them because of our ancient precedence hacks to convince bison that extra parentheses around a sub-SELECT in an expression are unambiguous. (Formally, they *are* ambiguous, but we don't especially care whether they're treated as part of the sub-SELECT or part of the expression. Bison cares, though.) Fix by adding a redundant-looking production for this case. This is a fine example of why fixing shift/reduce conflicts via precedence declarations is more dangerous than it looks: you can easily cause the parser to reject cases that should work. This has been wrong since commit 3db4056e22b0c6b2adc92543baf8408d2894fe91 or maybe before, and apparently some people have been working around it by inserting no-op casts. That method introduces a dump/reload hazard, as illustrated in bug #7838 from Jan Mate. Hence, back-patch to all active branches.
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