Kimahriman opened a new pull request #34294:
URL: https://github.com/apache/spark/pull/34294
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### What changes were proposed in this pull request?
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This PR adds codegen support to ArrayTransform. This is my first time
playing around with codegen, so definitely looking for any feedback. I ran into
several issues along the way which you'll see in some checks I had to add.
Specifically:
- I added lambda variable tracking to the codegen context, to make sure a
function can't be split out while there is any active lambda variables
- Made sure lambda functions themselves can never be considered for
subexpression elimination
- I still have to set the atomic references in the codegen to support any
children with CodegenFallback or just that fallback to interpreted in their
codegen path
Questions I have:
- Does it make sense to support both the traditional ExprCode approach with
lambda variables while also setting the atomic reference value for fallback
cases? Or should I just use the atomic reference to get the value everywhere
even in codegen cases since I have to set it anyway and simplify the code a
little bit?
- Obviously any other corner cases anyone can think of?
### Why are the changes needed?
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To improve performance of transform operations, letting the children be
codegen'd and participate in WholeStageCodegen
### Does this PR introduce _any_ user-facing change?
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No, only performance improvements.
### How was this patch tested?
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Existing unit tests, let me know if there's other codegen-specific unit
tests I should add.
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