cashmand opened a new pull request, #43984:
URL: https://github.com/apache/spark/pull/43984

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   ### What changes were proposed in this pull request?
   
   Fix two issues with the new Variant type:
   
   1) In `InterpretedUnsafeProjection`, define element size to be 8, since 
Variant has variable length, so it is categorized as a reference type, which 
always has size 8. This only manifests as an issue when codegen is disabled and 
an array or struct contains Variant values.
   
   2) Define and use a `ParquetGroupConverter` for Variant. The previous tests 
used the vectorized reader, so this issue didn't manifest.
   
   ### Why are the changes needed?
   
   Fixes crashes when Variant is used.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   Added a unit test that writes and reads an array of Variant values with 
codegen and the vectorized reader disabled. Reverting either of the two fixes 
causes the test to fail.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   No.


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