prashantwason commented on PR #20483:
URL: https://github.com/apache/hudi/pull/20483#issuecomment-6638905457

   @voonhous thanks for the review. Both points are addressed in 6416e5011170.
   
   **E2E:** I added `TestHiveSyncTool#testSyncWithUnionFields`, parameterized 
over the sync modes. It writes real parquet with a nullable union, a union with 
a record member, and an array of unions, then checks the synced Hive columns 
and the `spark.sql.sources.schema` property. It then adds a commit with the 
same schema, resyncs, and asserts that both schemas are unchanged. As you 
suggested, it leaves out the single-branch union because the random data 
fixture can't generate one; `TestHiveSchemaUtil` still covers that case.
   
   **UUID:** you're right. `HiveSchemaUtil` has mapped `UUID` to `binary` since 
#14344. By default (`parquet.avro.write-parquet-uuid=false`) the parquet writer 
stores a UUID as `binary (STRING)`, which the parquet-schema-based sync 
registered as `string`. It now syncs as `string` again, which also matches 
`SparkSchemaUtils`. I updated the expectation in 
`TestHiveSchemaUtil#testSchemaTypeConversion` to match.
   


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