allisonwang-db opened a new pull request #29137:
URL: https://github.com/apache/spark/pull/29137
### What changes were proposed in this pull request?
This PR adds initial plan in `AdaptiveSparkPlanExec` and generates tree
string for both current plan and initial plan. For example:
#### Current AQE plan tree string
```
AdaptiveSparkPlan isFinalPlan=true
+- *(3) BroadcastHashJoin
:- BroadcastQueryStage 2
...
```
#### After this change
```
AdaptiveSparkPlan isFinalPlan=true
:- CurrentPlan
: +- *(3) BroadcastHashJoin
: :- BroadcastQueryStage 2
: : ...
+- InitialPlan
+- SortMergeJoin
:- Sort
...
```
### Why are the changes needed?
It provides better visibility into the plan change introduced by AQE.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
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