[GitHub] [spark] MaxGekk commented on pull request #39891: [SPARK-42318][SPARK-42319][SQL] Assign name to _LEGACY_ERROR_TEMP_(2123|2125)

["MaxGekk (via GitHub)" <gi...@apache.org>]

MaxGekk commented on PR #39891:
URL: https://github.com/apache/spark/pull/39891#issuecomment-1420287962

   > cc @MaxGekk @cloud-fan Would you confirm if we should switched this error into internal error ??
   
   Don't think so. The function invokes itself recursively to merge struct fields too. Try to reproduce the error from user space using `UNION ALL` when some nested fields are not compatible.  


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