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https://issues.apache.org/jira/browse/CALCITE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16213283#comment-16213283
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slim bouguerra commented on CALCITE-2019:
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https://github.com/apache/calcite/pull/551
> Push count over druid's time column as count (*)
> ------------------------------------------------
>
> Key: CALCITE-2019
> URL: https://issues.apache.org/jira/browse/CALCITE-2019
> Project: Calcite
> Issue Type: Improvement
> Components: druid
> Reporter: slim bouguerra
> Assignee: Jesus Camacho Rodriguez
>
> Druid Time column is not null by default, thus we can transform {code} select
> count(__time) from table {code} to {code} select count(*) from table{code}
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