Commits on Aug 15, 2023

1. Simplify compressed pathkey lookup …

   When looking up a pathkey for compressed scan, we used to do a lot of
   work, including a quadratic lookup through all the equivalence members,
   to always arrive at the same canonical pathkey we started from. Just
   remove this useless code for a significant planning speedup.
   
   This uncovers two bugs in parameterization of decompressed paths and
   generation of equivalence members for segmentby columns, fix them as
   well.

   

   akuzm committed Aug 15, 2023
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