sbroeder opened a new pull request, #5226:
URL: https://github.com/apache/calcite/pull/5226

   …teral, Sarg) when pointCount >= 2
   
   RexSimplify.simplifySearch only evaluated a SEARCH(subject, Sarg) call 
against its Sarg when sarg.isPoints() && sarg.pointCount <= 1, with no check 
for whether the subject itself is a constant. A single-point Sarg with any 
subject folded correctly, and a multi-point Sarg with a column-reference 
subject simplified correctly elsewhere, but a literal subject compared against 
a multi-point Sarg (for example, SEARCH(5, Sarg[1, 2])) fell through every 
branch unevaluated instead of folding to a boolean constant.
   
   This can occur whenever a rule substitutes a literal for a column reference 
in a SEARCH condition, such as when
   FilterSetOpTransposeRule pushes a filter through a branch of a Union that 
projects a constant.
   
   ## Jira Link
   [CALCITE-7747](https://issues.apache.org/jira/browse/CALCITE-7747)
   
   ## Changes Proposed
   <!--
   Fix simplifySearch so that when the search subject is itself a RexLiteral, 
the call is expanded via the existing RexUtil.expandSearch and the result is 
simplified recursively, regardless of point count. This matches the treatment 
already given to a single-point Sarg, but adds the recursive simplify() call 
needed to fold the expanded comparison tree down to a constant.
   -->
   


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