Aleksei Shishkin created SPARK-50262:
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Summary: 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
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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