[SYSTEMDS-3921] New Rewrite for relational Selection Pushdown #2413
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added 2 commits
November 28, 2025 15:30
This patch is a minor step towards additional rewriting algorithms for relational operators, such as Selection. So far, only the test regarding it is implemented.
…s selections that depend on a previous join and switches their order of execution.
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This PR addresses one particular simplification rewrite mentioned in ticket [SYSTEMDS-3921] - the pushdown of a selection before a join it is dependent of.
After introducing relational operators in SystemDS, simplification rewrites for those operators are required.
With this rewrite possibility, the selection will be executed first and the join will then take the selection's output instead of the original matrix.
Testing was designed and executed similarly to builtIn raSelection and raJoin-Tests.