[SPARK-14600][SQL] Push predicates through Expand #12496
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cc @davies |
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Test build #56225 has finished for PR 12496 at commit
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| // the `groupByAttrs` has different meaning in `Expand.output`, it could be the original | ||
| // grouping expression or null, so here we create new instance of it. | ||
| val output = child.output ++ groupByAttrs.map(_.newInstance) :+ gid | ||
| Expand(projections, output, Project(child.output ++ groupByAliases, child)) |
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Do we still need this Project?
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Or we will evaluate the grouping expressions many times.
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Test build #56315 has finished for PR 12496 at commit
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LGTM, |
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What changes were proposed in this pull request?
https://issues.apache.org/jira/browse/SPARK-14600
This PR makes
Expand.outputhave different attributes from the grouping attributes produced by the underlyingProject, as they have different meaning, so that we can safely push down filter throughExpandHow was this patch tested?
existing tests.