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foo` which is no longer valid SQL.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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