>>> Tom Lane <[EMAIL PROTECTED]> wrote: 
> Introduce JOIN_SEMI and JOIN_ANTI join types, the former replacing
> JOIN_IN.  Unify the InClauseInfo and OuterJoinInfo infrastructure
> "SpecialJoinInfo".  Convert IN, EXISTS, and NOT EXISTS clauses at
> 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?

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