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[SPARK-52306][SQL] Add support of ALTER TABLE ... UNSET SERDEPROPERTIES #51017

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[SPARK-52306][SQL] Add support of ALTER TABLE ... UNSET SERDEPROPERTIES #51017

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What changes were proposed in this pull request?

Introduce a new SQL to enable unset SERDE properties:

ALTER TABLE table_identifier partition_spec UNSET SERDEPROPERTIES [ IF EXISTS ] ( key1, key2, ... )

Why are the changes needed?

Spark SQL already supports SET SERDEPROPERTIES, it would be more convenient if we can use UNSET SERDEPROPETIES

Does this PR introduce any user-facing change?

Yes, user can use this new SQL.

How was this patch tested?

Add unit tests:

./build/mvn  test -Dtest=none -Dsuites="org.apache.spark.sql.execution.command.AlterTableUnsetSerdePropertiesParserSuite" -pl :spark-sql_2.13
./build/mvn  test -Dtest=none -Dsuites="org.apache.spark.sql.execution.command.v1.AlterTableUnsetSerdePropertiesSuite" -pl :spark-sql_2.13
./build/mvn  test -Dtest=none -Dsuites="org.apache.spark.sql.hive.execution.command.AlterTableUnsetSerdePropertiesSuite" -pl :spark-hive_2.13
./build/mvn  test -Dtest=none -Dsuites="org.apache.spark.sql.execution.command.v2.AlterTableUnsetSerdePropertiesSuite" -pl :spark-sql_2.13

Was this patch authored or co-authored using generative AI tooling?

No.

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github-actions bot commented Sep 4, 2025

We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and ask a committer to remove the Stale tag!

@github-actions github-actions bot added the Stale label Sep 4, 2025
@github-actions github-actions bot closed this Sep 5, 2025
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