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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