MrHappyEnding opened a new pull request, #57789:
URL: https://github.com/apache/spark/pull/57789
### What changes were proposed in this pull request?
Mark `ApplyFunctionExpression` as stateful and add a regression test
verifying
that it produces a fresh expression instance.
### Why are the changes needed?
`ApplyFunctionExpression` reuses a mutable `SpecificInternalRow`. Without
being
marked stateful, the same expression instance could be shared by multiple
evaluators, causing concurrent evaluations to overwrite each other's inputs
and
produce incorrect results.
### Does this PR introduce *any* user-facing change?
Yes. It prevents incorrect results during concurrent evaluation of
`ApplyFunctionExpression`. There is no public API change.
### How was this patch tested?
Added `ApplyFunctionExpressionSuite` and ran:
build/sbt 'catalyst/testOnly *ApplyFunctionExpressionSuite'
build/sbt 'catalyst/testOnly *DataSourceV2FunctionSuite'
dev/lint-scala
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