wangyum opened a new pull request #33603:
URL: https://github.com/apache/spark/pull/33603
### What changes were proposed in this pull request?
Collapse repartitions if there is a project between them. For example:
```scala
sql("SELECT a FROM (SELECT id AS a, id AS b FROM range(10) DISTRIBUTE BY a,
b) t DISTRIBUTE BY a").explain(true)
```
Before this pr:
```
== Physical Plan ==
AdaptiveSparkPlan isFinalPlan=false
+- Exchange hashpartitioning(a#0L, 5), REPARTITION_BY_COL, [id=#18]
+- Project [a#0L]
+- Exchange hashpartitioning(a#0L, b#1L, 5), REPARTITION_BY_COL,
[id=#16]
+- Project [id#2L AS a#0L, id#2L AS b#1L]
+- Range (0, 10, step=1, splits=2)
```
After this pr:
```
== Physical Plan ==
AdaptiveSparkPlan isFinalPlan=false
+- Exchange hashpartitioning(a#0L, 5), REPARTITION_BY_COL, [id=#10]
+- Project [id#2L AS a#0L]
+- Range (0, 10, step=1, splits=2)
```
### Why are the changes needed?
Reduce shuffle to improve query performance.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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