adityaksolves commented on PR #18325:
URL: https://github.com/apache/iceberg/pull/18325#issuecomment-6661495734

   @Fokko @nastra Could one of you please review this PR when you have time?
   
   It allows promoting an unknown (Spark VOID) column to a primitive type in 
TypeUtil.isPromotionAllowed, which fixes ALTER TABLE ... ALTER COLUMN ... TYPE 
failing on v3 VOID columns (#18305). The v3 spec permits unknown to be promoted 
to any primitive type, and since the column holds only nulls the evolution is 
safe.
   
   Status: rebased on latest main, CI green (41/41), with tests in 
TestTypeUtil, TestSchemaUpdate and TestAlterTable for Spark 3.5/4.0/4.1/4.2. 
The overlapping PR #16528 was closed in favor of this one, so there's no 
duplicate effort pending.
   
   Happy to address any feedback. Thanks!


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