[SPARK-34775][SQL] Push down limit through window when partitionSpec is not empty#32475
[SPARK-34775][SQL] Push down limit through window when partitionSpec is not empty#32475AngersZhuuuu wants to merge 5 commits intoapache:masterfrom
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ping @wangyum |
...lyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/LimitPushDownThroughWindow.scala
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...src/test/scala/org/apache/spark/sql/catalyst/optimizer/LimitPushdownThroughWindowSuite.scala
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| // Sort is needed here because we need global sort. | ||
| window.copy(child = Limit(limitExpr, Sort(orderSpec, true, child))) | ||
| window.copy(child = Limit(limitExpr, | ||
| Sort(partitionSpec.map(SortOrder(_, Ascending)) ++ orderSpec, true, child))) |
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@cloud-fan Do we need to changed the sort order from NULLS FIRST to NULLS LAST? Impala have changed it.
| // Adding an extra Limit below WINDOW when the partitionSpec of all window functions is empty. | ||
| case LocalLimit(limitExpr @ IntegerLiteral(limit), | ||
| window @ Window(windowExpressions, Nil, orderSpec, child)) | ||
| window @ Window(windowExpressions, partitionSpec, orderSpec, child)) |
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can you provide a bit more context? why can we pushdown limit through window when there are partition specs?
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We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable. |
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What changes were proposed in this pull request?
This is a followup from #31691. Push down limit through Window when the partitionSpec of all window functions is not empty and the same order is used.
Push down limit through Window when the partitionSpec of all window functions is not empty
And the origin author is @leoluan2009, since he didn't reply for long and did this follow up after invitation
Why are the changes needed?
Improve query performance.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Added UT