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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2022/04/02 10:49:07 UTC
[GitHub] [spark] wangyum opened a new pull request #36046: [SPARK-38771][SQL] Adaptive Bloom filter Join
wangyum opened a new pull request #36046:
URL: https://github.com/apache/spark/pull/36046
### What changes were proposed in this pull request?
This PR introduces an adaptive Bloom filter Join rule for `AQEOptimizer`.
It has two benefit:
1. It reduces spilling data when sorting.
2. It improves join performance, especially join keys may be skewed.
It only works:
1. AQE enabled and can't convert to BroadcastHashJoin.
2. The filtering side rows should less than 100,000,000 rows.
3. The pruning side should be large and must spill data to disk when sorting.
### Why are the changes needed?
Improve query performance.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test and benchmark test.
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