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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2022/12/15 01:56:31 UTC

[GitHub] [spark] allisonport-db commented on pull request #38823: [SPARK-41290][SQL] Support GENERATED ALWAYS AS expressions for columns in create/replace table statements

allisonport-db commented on PR #38823:
URL: https://github.com/apache/spark/pull/38823#issuecomment-1352455011

   > Does the SQL standard say anything about the restrictions of the generate expression? Can we allow `GENERATED AS rand()`? I think at least catalyst should have a rule to check the expression and make sure the data type is the same as column type.
   
   Checking for data type make sense.
   
   Other restrictions we can enforce
   - no UDFs
   - only deterministic functions
   - no subqueries
   - no window functions
   - no aggregate functions
   - no generator functions
   - interdependence with other generated columns


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