clintropolis commented on PR #15694:
URL: https://github.com/apache/druid/pull/15694#issuecomment-1895490098

   >WDYT about creating a precached ExprEval (which is thread-safe) for 
constant expressions, instead of creating a thread-unsafe Expr.
   
   `Expr` are threadsafe typically since they are immutable, the problem is 
that `Expr` for constants was modified to contain an `ExprEval` which are not 
thread-safe.


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