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1. Support the new statements and operations in SQL parser and Planner.
2. Extend Executor to support the new operations.

Rejected Alternatives

An alternatives alternative approach to query monitoring is that the SQL client or gateway book keeps every query and is responsible for updating the query status through polling or callbacks. In that way, the query status is better maintained, and we wouldn’t lose track of the queries in cases that they’re cleaned up by the cluster or the cluster is unavailable.

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