nikolamand-db opened a new pull request, #46734:
URL: https://github.com/apache/spark/pull/46734
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### What changes were proposed in this pull request?
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Add support for changing collation of a column with `ALTER COLUMN` command.
Use existing support for `ALTER COLUMN` with type to enable changing collations
of column. Syntax example:
```
ALTER TABLE t1 ALTER COLUMN col TYPE STRING COLLATE UTF8_BINARY_LCASE
```
### Why are the changes needed?
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Enable changing collation on column.
### Does this PR introduce _any_ user-facing change?
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Yes, it adds support for changing collation of column.
### How was this patch tested?
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Added tests to `DDLSuite` and `DataTypeSuite`.
### Was this patch authored or co-authored using generative AI tooling?
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No.
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