GitHub user rednaxelafx opened a pull request:
https://github.com/apache/spark/pull/20870
[SPARK-23760][SQL]: CodegenContext.withSubExprEliminationExprs should
save/restore CSE state correctly
## What changes were proposed in this pull request?
Fixed `CodegenContext.withSubExprEliminationExprs()` so that it
saves/restores CSE state correctly.
## How was this patch tested?
Added new unit test to verify that the old CSE state is indeed saved and
restored around the `withSubExprEliminationExprs()` call. Manually verified
that this test fails without this patch.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rednaxelafx/apache-spark codegen-subexpr-fix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20870.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20870
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