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## What changes were proposed in this pull request? This PR generalizes the `NullFiltering` optimizer rule in catalyst to `InferFiltersFromConstraints` that can automatically infer all relevant filters based on an operator's constraints while making sure of 2 things: (a) no redundant filters are generated, and (b) filters that do not contribute to any further optimizations are not generated. ## How was this patch tested? Extended all tests in `InferFiltersFromConstraintsSuite` (that were initially based on `NullFilteringSuite` to test filter inference in `Filter` and `Join` operators. In particular the 2 tests ( `single inner join with pre-existing filters: filter out values on either side` and `multiple inner joins: filter out values on all sides on equi-join keys` attempts to highlight/test the real potential of this rule for join optimization. Author: Sameer Agarwal <sameer@databricks.com> Closes #11665 from sameeragarwal/infer-filters. |
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