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https://issues.apache.org/jira/browse/CALCITE-1776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17528914#comment-17528914
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Julian Hyde commented on CALCITE-1776:
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[~nobigo], My 1776-corr branch is ready for review.
> Implement CORR and REGR_* aggregate functions
> ---------------------------------------------
>
> Key: CALCITE-1776
> URL: https://issues.apache.org/jira/browse/CALCITE-1776
> Project: Calcite
> Issue Type: New Feature
> Reporter: Dmitri Shtilman
> Priority: Minor
> Labels: pull-request-available
>
> Implement correlation coefficient aggregate: CORR
> As well as the missing regression aggregates:
> REGR_SLOPE, REGR_INTERCEPT, REGR_COUNT, REGR_R2, REGR_AVGX, REGR_AVGY,
> REGR_SXY
> For reference, REGR_SXX and REGR_SYY have been added in [CALCITE-422]
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