[SPARK-17357][SPARK-6624][SQL] Convert filter predicate to CNF in Optimizer for pushdown #15558
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Test build #67234 has finished for PR 15558 at commit
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cc @hvanhovell @cloud-fan Can you review this when you have time? Thanks! |
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ping @hvanhovell @cloud-fan again. |
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cc @liancheng |
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Test build #70038 has finished for PR 15558 at commit
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This was referenced Jun 5, 2020
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What changes were proposed in this pull request?
This PR is proposed to solve the problem #14912 tried to solve before. Simply said, currently some predicates can not be correctly pushdown through operators due to its format is a bunch of ORs.
A simple example is (a > 10) || (b > 2 && c == 3). If a datasource has attributes a and b, this filtering predicate cannot be pushdown. If we can convert it to CNF (a > 10 || b > 2) && (a > 10 || c == 3). Then we can push down (a > 10 || b > 2).
To convert the predicate to CNF format can solve this formally instead of a hacky way on #14912.
We have previous PRs for CNF conversion, such as #8200. Most of added tests in
CNFNormalizationSuiteare copied from #8200.How was this patch tested?
Jenkins tests.
Please review https://cwiki.apache.org/confluence/display/SPARK/Contributing+to+Spark before opening a pull request.