[SPARK-35442][SQL] Support propagate empty relation through aggregate/union #35148
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zinking
reviewed
Jan 10, 2022
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| val (plan2, adaptivePlan2) = runAdaptiveAndVerifyResult( | ||
| "SELECT key, count(*) FROM testData WHERE value = 'no_match' GROUP BY key limit 1") | ||
| assert(findTopLevelBaeAggregate(plan1).size == 2) |
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What changes were proposed in this pull request?
LogicalQueryStage(_, agg: BaseAggregateExec)check inAQEPropagateEmptyRelationLeafNodecheck inPropagateEmptyRelationBase, so we can eliminateLogicalQueryStagetoLocalRelationapplyFuncandcommonApplyFuncinPropagateEmptyRelationBaseWhy are the changes needed?
The Aggregate in AQE is different with others, the
LogicalQueryStagelooks likeLogicalQueryStage(Aggregate, BaseAggregate). We should handle this case specially.Logically, if the Aggregate grouping expression is not empty, we can eliminate it safely.
Does this PR introduce any user-facing change?
no
How was this patch tested?
add new test in
AdaptiveQueryExecSuiteSupport propagate empty relation through aggregateSupport propagate empty relation through union