>>> Tom Lane <[EMAIL PROTECTED]> wrote: > Introduce JOIN_SEMI and JOIN_ANTI join types, the former replacing > JOIN_IN. Unify the InClauseInfo and OuterJoinInfo infrastructure into > "SpecialJoinInfo". Convert IN, EXISTS, and NOT EXISTS clauses at top > level of WHERE into semi and anti joins respectively. It just struck me that this may cause additional joins to count against the join_collapse_limit. If so, that could cause some borderline queries to optimize poorly if the limit isn't raised. Is that a reasonable concern? Possibly something to document in the release notes? -Kevin
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