6c1c1af6b4
### What changes were proposed in this pull request?
The `RemoveRedundantProjects` feature can conflict with the AQE broadcast threshold ([PR](https://github.com/apache/spark/pull/32391)) sometimes. After removing the project, the physical plan to logical plan link can be changed and we may have a `Project` above `LogicalQueryStage`. This breaks AQE broadcast threshold, because the stats of `Project` does not have the `isRuntime = true` flag, and thus still use the normal broadcast threshold.
This PR updates `RemoveRedundantProjects` to not remove `ProjectExec` that has a different logical plan link than its child.
### Why are the changes needed?
Make AQE broadcast threshold work in more cases.
### Does this PR introduce _any_ user-facing change?
no
### How was this patch tested?
new tests
Closes #33222 from cloud-fan/aqe2.
Lead-authored-by: Wenchen Fan <wenchen@databricks.com>
Co-authored-by: Wenchen Fan <cloud0fan@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
(cherry picked from commit
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