Ma Gang created KYLIN-3632:
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             Summary: Add configuration that can switch on/off 
preparedStatement cache in Kylin server
                 Key: KYLIN-3632
                 URL: https://issues.apache.org/jira/browse/KYLIN-3632
             Project: Kylin
          Issue Type: Improvement
          Components: Query Engine
            Reporter: Ma Gang
            Assignee: Ma Gang
             Fix For: v2.5.1


From Kylin 2.5 we introduce preparedStatement cache feature, it can be turn 
on/off for each request by adding a new field "enableStatementCache" in the 
query request, by default it is on. We need to add a switch in server level, 
the preparedStatement cache can take effective only when the switch is on, by 
default, it will be set to false.



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