alamb opened a new issue, #5821:
URL: https://github.com/apache/arrow-datafusion/issues/5821
The type coercion is implemented as an optimizer - and it
changes schemas of particular `Expr`essions.
And it **takes care** of `Expr::Case`.
But `Expr::Projection` caches the schema in itself - so it is not updated!
Therefore we get a mismatch between declared schema vs batch schema.
Essentially this PR makes `Expr::Case` to **not** change a schema during the
coercion optimizer.
_Originally posted by @mslapek in
https://github.com/apache/arrow-datafusion/pull/5734#discussion_r1153540699_
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