Amol Dixit created HIVE-23794:
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Summary: HiveConnection.rollback always throws a "Method not
supported" exception
Key: HIVE-23794
URL: https://issues.apache.org/jira/browse/HIVE-23794
Project: Hive
Issue Type: Bug
Reporter: Amol Dixit
HiveConnection.rollback automatically generated implementation always throws a
generic "Method not supported" exception and thus is not compliant with the
JDBC spec. For HiveConnection autoCommit mode is always on and this connection
do not allow to set the autoCommit mode to false. If setAutoCommit is called
and the auto-commit mode is not changed, the call is a no-op.
Per JDBC spec, an exception can be thrown only if the connection is closed, DB
access error occurs or the method is called during a transaction (which is not
a case for HiveConnection).
JDBC spec does not say a word about not supporting the method by the driver.
The most correct behavior could be to throw only if the request tries to
explicitly call rollback (as HiveConnection.getAutoCommit always returns true
and setAutoCommit call is no-op).
This issue is a blocker for JDBC connection pools (i.e. HikariCP) that expect
JDBC-compliant behavior from the driver.
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