Commits on Aug 22, 2026

1. Restrict partial unique index estimates to base quals

   A partial index predicate can be proven by movable join or EC-derived
   clauses.  That proof is sufficient for index path selection, but not for
   treating a base-relation column as globally unique during selectivity
   estimation.
   Store the base-only result in predOKBase and use it for simple-column
   and expression-index estimates.  This avoids underestimated base scans
   while preserving valid estimates when base quals satisfy the predicate.
   Add regression coverage for join-only and base-proven predicates.

   

   authored and Commitfest Bot committed

   Aug 22, 2026
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