JkSelf opened a new pull request #29268:
URL: https://github.com/apache/spark/pull/29268
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### What changes were proposed in this pull request?
Currently the `OptimizeSkewedJoin` rule check the skewed partition only
based on the compressed data size, which is not accurate when the compression
ratio is very high. This PR collect the row count info by using the
`CollectionAccumulator` and then add the row count info to check the skew
partition in the `OptimizeSkewedJoin` rule.
### Why are the changes needed?
Optimize the `OptimizeSkewedJoin` rule by using the row count info.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
existing ut
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