stefankandic opened a new pull request, #49147:
URL: https://github.com/apache/spark/pull/49147
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### What changes were proposed in this pull request?
Adding proper support for implicit casting of subqueries in collation type
coercion. Currently I only added support for `Project` and `Aggregate` plans in
subquery expression, but we might need to add more later.
### Why are the changes needed?
Since `SubqueryExpression` is a special type of expression which can't
simply be cast to a new type, we need to add this as a special case to avoid
errors when trying to change the data type in these types of queries.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Added new unit tests.
### Was this patch authored or co-authored using generative AI tooling?
No.
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