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SQL operation

Cluster Client Command

ShowQueriesOperation

ClusterClient#listJobs

StopQueryOperation

ClusterClient#stoplWithSavepoint

CancelQueryOperation

ClusterClient#cancel

TriggerSavepointOperation

ClusterClient#triggerSavepoint

DisposeSavepointOperation

ClusterClient#disposeSavepoint

In addition, to interact with the clusters, Executor should be able to create ClusterClient through ClusterClientFactory, thus a  ClusterClientServiceLoader would be added to Executor.

Implementation Plan

The implementation plan would be simple:

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