[Feature] Make sql gateway operations cluster level. #587
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# Conflicts: # scaleph-engine/scaleph-engine-sql-gateway/pom.xml
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Purpose of this pull request
Currently in sql-gateway, when we execute an operation, we should firstly open a session and get a session handler from server, then we ca execute query with this session handle.
This causes those problems:
So we should make sql gateway operations cluster level, that means we can communicate with sql-gateway without getting session handle.