[GitHub] [spark] peter-toth opened a new pull request #24553: [SPARK-27604][SQL] Enhance constant propagation

[GitBox <gi...@apache.org>]

peter-toth opened a new pull request #24553: [SPARK-27604][SQL] Enhance constant propagation
URL: https://github.com/apache/spark/pull/24553
 
 
   ## What changes were proposed in this pull request?
   
   This PR improves `ConstantPropagation` rule by extending propagation from `attribute => constant` to `expression => constant` mapping and allows substituting deterministic expressions to constants in any expression. (Previously substitution of attributes only in `EqualTo` and `EqualNullSafe` was allowed).
   ```
   SELECT * FROM table WHERE abs(i) = 5 AND j <= abs(i) + 3  =>  ... WHERE abs(i) = 5 AND j <= 8
   ```
   
   ## How was this patch tested?
   
   Existing UTs.
   
   

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