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Posted to issues@kylin.apache.org by "Ma Gang (JIRA)" <ji...@apache.org> on 2018/06/29 08:13:00 UTC

[jira] [Created] (KYLIN-3434) Support prepare statement in Kylin server side

Ma Gang created KYLIN-3434:
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             Summary: Support prepare statement in Kylin server side
                 Key: KYLIN-3434
                 URL: https://issues.apache.org/jira/browse/KYLIN-3434
             Project: Kylin
          Issue Type: Improvement
            Reporter: Ma Gang
            Assignee: Ma Gang


Kylin use calcite as sql engine, when a sql comes to Kylin server, it requires to be parsed, optimized, code gen, and then query Kylin's cube storage, the previous 3 steps often take 50-150 ms to complete(depends on the complexity of the sql). If we support to cache the parsed result in Kylin server, the 3 steps will be saved.

The idea is to cache calcite's PreparedStatement object and related OLAPContexts in the server side, when the prepare request comes with the same sql, reuse the PreparedStatement to do the execution. Since the PreparedStatement is not thread safe, so I planned to use ObjectPool to cache the PreparedStatement.(use apache commons-pool lib)



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