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https://issues.apache.org/jira/browse/CALCITE-1776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529310#comment-17529310
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xiong duan commented on CALCITE-1776:
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I run the same test SQL in agg.iq and here are some problems in PR:
{noformat}
1：agg.iq about the CORR Funciton has a wrong result: corr(SAL, COMM) as
CORR(SAL, COMM) should be -0.6992097353323843 but is -2.423927082485599
2: agg.iq about the REGR_AVGX and REGR_AVGY Function has a wrong result. Looks
like the result has swap.
3: agg.iq about the REGR_R2 has a wrong result.{noformat}
> 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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