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Posted to issues@kylin.apache.org by "hongbin ma (JIRA)" <ji...@apache.org> on 2017/04/10 13:18:41 UTC

[jira] [Commented] (KYLIN-2539) Useless filter dimension will impact cuboid selection.

    [ https://issues.apache.org/jira/browse/KYLIN-2539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15962833#comment-15962833 ] 

hongbin ma commented on KYLIN-2539:
-----------------------------------

I added a org.apache.kylin.metadata.filter.FilterOptimizeTransformer to detect patterns like (x = ? or 1 = 1) and replace such patterns with ConstantTupleFilter.TRUE

> Useless filter dimension will impact cuboid selection.
> ------------------------------------------------------
>
>                 Key: KYLIN-2539
>                 URL: https://issues.apache.org/jira/browse/KYLIN-2539
>             Project: Kylin
>          Issue Type: Bug
>            Reporter: Yifan Zhang
>
> Query1: select count(*) from test_kylin_fact where (cal_dt > DATE'2012-01-01') and (seller_id is null or 1 = 1)
> Query2: select count(*) from test_kylin_fact where (cal_dt > DATE'2012-01-01')
> Q1 and Q2 return identical result but hit different cuboid: 43051 and 1310735, and result in different query performance.



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