[CORE] Remove local sort for TopNRowNumber #6381
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ACK, will benchmark TPCH/DS on this pull request |
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| _, | ||
| SortExecTransformer(_, false, p2: ProjectExecTransformer, _)) | ||
| if p1.outputSet == p2.child.outputSet => | ||
| Some((p1, p2.child)) |
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Is there any more
case p1 @ ProjectExec(_, SortExec(_, false, p2: ProjectExec, _))
if p1.outputSet == p2.child.outputSet =>
Some((p1, p2.child))
case p1 @ProjectExecTransformer(
_,
SortExec(_, false, p2: ProjectExecTransformer, _))
if p1.outputSet == p2.child.outputSet =>
Some((p1, p2.child))
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I think it won't happen. We only pull out project from sort if the sort is offloaded, so the pre/post project should only happen with SortExecTransformer.
| // from pre/post project-pulling | ||
| case ProjectLike(PartialSortLike(ProjectLike(child))) if plan.outputSet == child.outputSet => | ||
| child | ||
| case ProjectLike(PartialSortLike(child)) => plan.withNewChildren(Seq(child)) |
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This logic is lost. Generated by PullOutPostProject.
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thank you @zml1206 for the reminder
Rebase velox 2023-12-21 ``` 2ec4b5d Refactor Unnest::generateOutput method (apache#8077) 4ab8c0d Add error messages when malloc allocator hits capacity limit (apache#8075) 298260f Track the file ages for AyncDataCache and SsdCache (apache#6381) 4fe3738 Change enable_sorted_aggregations gflag to true by default (apache#8112) 992d5a6 Fix flaky SharedArbitrationTest.failedToReclaimFromHashJoinBuildersIn… (apache#8120) cdbd430 Fix links in October 2023 monthly update (apache#8116) ```
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ACK, will benchmark TPCH/DS on this pull request |
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===== Performance report for TPCH SF2000 with Velox backend, for reference only ====
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===== Performance report for TPCDS SF2000 with Velox backend, for reference only ====
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cc @zhztheplayer @JkSelf @zml1206 thank you |
| } else { | ||
| Seq(Nil) | ||
| Seq(partitionSpec.map(SortOrder(_, Ascending)) ++ orderSpec) |
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super.requiredChildOrdering Implemented differently in different spark versions. In addition, according to the original logic, ck backend should not need child order.
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for 1, it's a good point, it seems the WindowExecBase has implemented these methods since 3.3
for 2, the ck backend requires child ordering and before we did not remove local sort before window
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I think we should retain requiredChildOrderingForWindow instead of using velox configuration to control ck backend
although it has no effect by default value.
| * - Offload WindowGroupLimit to native TopNRowNumber | ||
| * - The columnar window type is `sort` | ||
| */ | ||
| object EliminateLocalSort extends Rule[SparkPlan] { |
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@ulysses-you Do we have chance to eliminate the local sort for VeloxColumnarWriteFilesExec here?
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There are some limitation to remove sort before write files, e.g., we can not remove the sort which is created by user (to improve compression ratio). We can only remove the sort which is added from Spark, but it's hard to find that sort in this new rule only using require child ordering framework, we need to check if all sort fields are partition columns.
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LGTM |
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This reverts commit 0448115.
What changes were proposed in this pull request?
This pr adds a new rule
EliminateLocalSortto unify the existed drop local sort code, and also correctTopNRowNumberoperator require child ordering to help remove unneceesary local sort.For now, the unnecessary local sort would happen if:
sortHow was this patch tested?
add test & pass tests