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https://issues.apache.org/jira/browse/KYLIN-4998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17358143#comment-17358143
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ASF GitHub Bot commented on KYLIN-4998:
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lgtm-com[bot] commented on pull request #1658:
URL: https://github.com/apache/kylin/pull/1658#issuecomment-855412174
This pull request **introduces 7 alerts** when merging
f0cb8cfd24505301c98da6643e5cb3e2f028efb1 into
2edeaea625ce5a1e8bfbc73a72fbafccbfb420ff - [view on
LGTM.com](https://lgtm.com/projects/g/apache/kylin/rev/pr-643c1c92f43d141f303e5cf8a3dbf7a8d50be167)
**new alerts:**
* 4 for Useless comparison test
* 2 for Dereferenced variable may be null
* 1 for Useless null check
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> Remove partition dimension in cuboid routing to accelerate query
> ----------------------------------------------------------------
>
> Key: KYLIN-4998
> URL: https://issues.apache.org/jira/browse/KYLIN-4998
> Project: Kylin
> Issue Type: New Feature
> Components: Query Engine
> Affects Versions: v4.0.0-beta
> Reporter: ShengJun Zheng
> Assignee: ShengJun Zheng
> Priority: Major
> Fix For: v4.0.0
>
>
> We'll always need to filter data using partition column, but no need to
> include partition in aggregation dimensions. For these cases, Kylin will
> choose cuboid that include partition column. It's not efficient enough for
> those queries and we can't take the best advantage of precomputing.
> Recently we have tried to split a query into two parts, one part of query
> will process segments whose data is fully used in a query so that it can
> choose cuboid without partition column. This dose bring great improvement for
> big queries, one of our test cases' response time reduced from 20s to 6s.
> We'll refine the code and share it.
>
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