wangyum opened a new pull request #35301:
URL: https://github.com/apache/spark/pull/35301
### What changes were proposed in this pull request?
This pr change the strategy of `Eliminate Limits` batch from Once to
fixedPoint in AQEOptimizer.
### Why are the changes needed?
Fix bug. Otherwise check batch idempotence will fail:
```scala
spark.range(10).write.saveAsTable("t1")
spark.table("t1").distinct().limit(10086).selectExpr("cast(id as
string)").limit(20).collect()
```
```
Once strategy's idempotence is broken for batch Eliminate Limits
!GlobalLimit 20
Project [cast(id#3L as string) AS id#6]
!+- LocalLimit 20
+- LogicalQueryStage Aggregate [id#3L], [id#3L],
HashAggregate(keys=[id#3L], functions=[])
! +- Project [cast(id#3L as string) AS id#6]
! +- LogicalQueryStage Aggregate [id#3L], [id#3L],
HashAggregate(keys=[id#3L], functions=[])
```
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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