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https://issues.apache.org/jira/browse/SPARK-50262?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-50262:
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Labels: pull-request-available (was: )
> Forbid change complex types during altering collation
> -----------------------------------------------------
>
> Key: SPARK-50262
> URL: https://issues.apache.org/jira/browse/SPARK-50262
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Aleksei Shishkin
> Priority: Major
> Labels: pull-request-available
>
> SPARK-48413 has brought ability to change collation on table.
> But it seems to be too wide, because people couldn't change the whole
> StructType/MapType/ArrayType by altering before.
> Right now there is found problem with altering collation when table has
> metadata. Altering will be failed because of a metadata mismatch between
> user's type (that doesn't have metadata) and existing schema.
> So I suggest to shrink the feature to only leaf string types.
> People will be able to change any collation still, but they need to use full
> column path:
> {code:sql}
> ALTER TABLE table ALTER COLUMN full.column.path TYPE STRING COLLATE UNICODE
> {code}
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