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Posted to commits@calcite.apache.org by "rongrong (via GitHub)" <gi...@apache.org> on 2025/06/24 23:24:24 UTC

Re: [PR] [CALCITE-6770] Preserve column names when casts are inserted in projects [calcite]

rongrong commented on PR #4130:
URL: https://github.com/apache/calcite/pull/4130#issuecomment-3002143261

   This actually breaks the following SQL:
   ```
   SELECT
     CASE
       WHEN ID IS NOT NULL
       THEN foo
       ELSE CAST(ID AS VARCHAR)
     END AS ID
   FROM testTable;
   ```
   because it would rewrite the THEN clause to `THEN CAST(foo AS VARCHAR) AS foo` which is no longer valid SQL. Not all places accept identifiers accept alias.


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