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postgres-lambda-diff

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    Tom Lane authored
    The original coding of EquivalenceClasses didn't foresee that appendrel
    child relations might themselves be appendrels; but this is possible for
    example when a UNION ALL subquery scans a table with inheritance children.
    The oversight led to failure to optimize ordering-related issues very well
    for the grandchild tables.  After some false starts involving explicitly
    flattening the appendrel representation, we found that this could be fixed
    easily by removing a few implicit assumptions about appendrel parent rels
    not being children themselves.
    
    Kyotaro Horiguchi and Tom Lane, reviewed by Noah Misch
    a87c7291
    History
    PostgreSQL Database Management System
    =====================================
    
    This directory contains the source code distribution of the PostgreSQL
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