[KYLIN-3832] Kylin pushdown to support postgresql

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: v2.5.2
• Fix Version/s: v3.1.0
• Component/s: Query Engine
• Assignee: weibin0516
• Reporter: hailin.huang
• Due: 26/Feb/19
• Created: 26/Feb/19 08:29
• Updated: 03/Nov/21 06:14
• Resolved: 20/Dec/19 10:43

Description

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)

Issue Links

• fixes: KYLIN-3996 postgresql can not to be used to construct the flat hive table in NO.1 step in building cube via datasourcedefaultSdk
• links to: GitHub Pull Request #747
• links to: GitHub Pull Request #902