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  • Tom Lane's avatar
    Deduce equality constraints that are implied by transitivity of · cd9f0ca5
    Tom Lane authored
    mergejoinable qual clauses, and add them to the query quals.  For
    example, WHERE a = b AND b = c will cause us to add AND a = c.
    This is necessary to ensure that it's safe to use these variables
    as interchangeable sort keys, which is something 7.0 knows how to do.
    Should provide a useful improvement in planning ability, too.
    cd9f0ca5
paths.h 3.39 KB