hailin.huang created KYLIN-3832:
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             Summary: Kylin Pushdown query not support postgresql
                 Key: KYLIN-3832
                 URL: https://issues.apache.org/jira/browse/KYLIN-3832
             Project: Kylin
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: v2.5.2
            Reporter: hailin.huang
             Fix For: Future


when I run pushdown to postgresql in my env, I encount the below exception.
it seems that kylin need support more JDBC Driver, PushDownRunnerJdbcImpl.class 
should be more general.


2019-02-26 16:12:53,168 ERROR [Query 207dcf77-7c14-8078-ea8b-79644a0c576d-48] 
service.QueryService:989 : pushdown engine failed current query too
java.sql.SQLException: Unrecognized column type: int8
        at 
org.apache.kylin.query.adhoc.PushDownRunnerJdbcImpl.toSqlType(PushDownRunnerJdbcImpl.java:260)
        at 
org.apache.kylin.query.adhoc.PushDownRunnerJdbcImpl.extractColumnMeta(PushDownRunnerJdbcImpl.java:192)
        at 
org.apache.kylin.query.adhoc.PushDownRunnerJdbcImpl.executeQuery(PushDownRunnerJdbcImpl.java:68)
        at 
org.apache.kylin.query.util.PushDownUtil.tryPushDownQuery(PushDownUtil.java:122)
        at 
org.apache.kylin.query.util.PushDownUtil.tryPushDownSelectQuery(PushDownUtil.java:69)




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