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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2022/12/21 20:51:27 UTC
[GitHub] [spark] allisonwang-db opened a new pull request, #39161: [SPARK-41669][SQL] Early pruning in canCollapseExpressions
allisonwang-db opened a new pull request, #39161:
URL: https://github.com/apache/spark/pull/39161
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### What changes were proposed in this pull request?
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This PR speeds up the optimizer rule `CollapseProject` when the project list contains a large number of expressions by doing early pruning in `canCollapseExpressions`.
This PR also adds a new benchmark in WideSchemaBenchmark to compare the performance.
Before this change:
```
[info] Apple M1 Max
[info] optimize large select: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative
[info] ------------------------------------------------------------------------------------------------------------------------
[info] 100 columns 7 8 1 0.0 6820416.0 1.0X
[info] 1000 columns 170 180 5 0.0 170239250.0 0.0X
[info] 10000 columns 13655 13823 237 0.0 13655051334.0 0.0X
```
After this change:
```
[info] Apple M1 Max
[info] optimize large select: Best Time(ms) Avg Time(ms) Stdev(ms) Rate(M/s) Per Row(ns) Relative
[info] ------------------------------------------------------------------------------------------------------------------------
[info] 100 columns 5 5 1 0.0 4766000.0 1.0X
[info] 1000 columns 39 41 1 0.0 39015250.0 0.1X
[info] 10000 columns 450 468 21 0.0 450092958.0 0.0X
```
### Why are the changes needed?
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1. If you propose a new API, clarify the use case for a new API.
2. If you fix a bug, you can clarify why it is a bug.
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To improve query compilation performance for wide tables.
### Does this PR introduce _any_ user-facing change?
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No
### How was this patch tested?
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Existing unit tests.
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[GitHub] [spark] cloud-fan closed pull request #39161: [SPARK-41669][SQL] Early pruning in canCollapseExpressions
Posted by GitBox <gi...@apache.org>.
cloud-fan closed pull request #39161: [SPARK-41669][SQL] Early pruning in canCollapseExpressions
URL: https://github.com/apache/spark/pull/39161
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[GitHub] [spark] cloud-fan commented on pull request #39161: [SPARK-41669][SQL] Early pruning in canCollapseExpressions
Posted by GitBox <gi...@apache.org>.
cloud-fan commented on PR #39161:
URL: https://github.com/apache/spark/pull/39161#issuecomment-1362305791
thanks, merging to master!
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[GitHub] [spark] allisonwang-db commented on pull request #39161: [SPARK-41669][SQL] Early pruning in canCollapseExpressions
Posted by GitBox <gi...@apache.org>.
allisonwang-db commented on PR #39161:
URL: https://github.com/apache/spark/pull/39161#issuecomment-1362304734
cc @cloud-fan
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