ulysses-you opened a new pull request, #40574:
URL: https://github.com/apache/spark/pull/40574
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### What changes were proposed in this pull request?
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Add a new rule `CoalesceCachePartitions` to support coalesce partitions with
`TableCacheQueryStageExec`. In order to reuse the code path with
`CoalesceShufflePartitions`, this pr also does a small refactor about how we
coalesce partitions.
RDD cache use the RDD id and partition id as the block id, so it seems not
possible to split skewd partitions like shuffle. To reduce complexity, this pr
does not allow coalesce partitions with both shuffle and cache stage since
shuffle read may contain skewed partition spec.
For example, the follow case can not be coalesced by both
`CoalesceCachePartitions` and `CoalesceShufflePartitions`.
```
SMJ
ShuffleQueryStage
TableCacheStage
```
### Why are the changes needed?
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Make AQE support coalesce table cache stage partitions.
### Does this PR introduce _any_ user-facing change?
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yes, add a new config to control if coalesce partitions for table cache
stage.
### How was this patch tested?
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add tests
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