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https://issues.apache.org/jira/browse/CALCITE-6548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17942062#comment-17942062
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xiong duan commented on CALCITE-6548:
-------------------------------------
The returned data from Oracle is different from that of other databases (such
as Pg and Spark).
In Postgresql:
{code:java}
SELECT COVAR_POP(x, y) FROM (VALUES (1, 2)) AS t(x, y); // return 0{code}
In Oracle:
{code:java}
SELECT COVAR_POP(x, y) FROM (SELECT 1 x, 2 y) t; // return null{code}
> Result type inferred for COVAR_SAMP、COVAR_POP is incorrect
> ----------------------------------------------------------
>
> Key: CALCITE-6548
> URL: https://issues.apache.org/jira/browse/CALCITE-6548
> Project: Calcite
> Issue Type: Improvement
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
>
> COVAR_SAMP can return NULL. If the function is applied to an empty set, it
> returns null. E.g. see the Oracle documentation:
> [https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/VAR_SAMP.html|https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/COVAR_SAMP.html]
> .
> COVAR_POP see the Oracle documentation:
> [https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/COVAR_POP.html|https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/COVAR_POP.html].
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