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https://issues.apache.org/jira/browse/CALCITE-2101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16298623#comment-16298623
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slim bouguerra commented on CALCITE-2101:
-----------------------------------------
https://github.com/apache/calcite/pull/586
> Push Count(column) over Druid storage handler
> ---------------------------------------------
>
> Key: CALCITE-2101
> URL: https://issues.apache.org/jira/browse/CALCITE-2101
> Project: Calcite
> Issue Type: Bug
> Reporter: slim bouguerra
> Assignee: slim bouguerra
> Fix For: 1.16.0
>
>
> We can make use of newly added filtered aggregate (ie
> org.apache.calcite.adapter.druid.DruidQuery.JsonFilteredAggregation) and push
> down Count(column) as
> {code} Count(*) where column is not Null {code}
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