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https://issues.apache.org/jira/browse/KYLIN-4791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17217203#comment-17217203
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ASF GitHub Bot commented on KYLIN-4791:
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zzcclp commented on pull request #1454:
URL: https://github.com/apache/kylin/pull/1454#issuecomment-712540484
Raise another pr
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> Throws exception 'UnsupportedOperationException: empty.reduceLeft' when there
> are cast expressions in the filters of FilePruner
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: KYLIN-4791
> URL: https://issues.apache.org/jira/browse/KYLIN-4791
> Project: Kylin
> Issue Type: Bug
> Components: Query Engine, Spark Engine
> Affects Versions: v4.0.0-alpha
> Reporter: Zhichao Zhang
> Assignee: Zhichao Zhang
> Priority: Minor
> Fix For: v4.0.0-beta
>
>
> When execute function 'pruneSegments' of FilePruner, if there are some cast
> expressions in filter, it will throw exception
> 'UnsupportedOperationException: empty.reduceLeft'.
>
> Solution:
> Convert cast expressions in filter to attribute before translating filter.
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