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[SPARK-49843][SQL] Fix change comment on char/varchar columns
### What changes were proposed in this pull request? Fix the issue in `AlterTableChangeColumnCommand` where changing the comment of a char/varchar column also tries to change the column type to string. ### Why are the changes needed? Because the newColumn will always be a `StringType` even when the metadata says that it was originally char/varchar. ### Does this PR introduce _any_ user-facing change? Yes, the query will no longer fail when using this code path. ### How was this patch tested? New query in golden files. ### Was this patch authored or co-authored using generative AI tooling? No. Closes apache#48315 from stefankandic/fixAlterVarcharCol. Authored-by: Stefan Kandic <stefan.kandic@databricks.com> Signed-off-by: Max Gekk <max.gekk@gmail.com>
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