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https://issues.apache.org/jira/browse/CALCITE-2323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16490169#comment-16490169
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John Fang commented on CALCITE-2323:
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Thanks for [~julianhyde]. I I have update the PR according to your comments.
> The configuration parameter "defaultNullCollation" which enum NullCollation {
> LOW, HIGH, FIRST, LAST } to allow alternative policies, but it can't take
> effect for over();
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2323
> URL: https://issues.apache.org/jira/browse/CALCITE-2323
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: John Fang
> Assignee: Julian Hyde
> Priority: Major
>
> For example, the following query:
> *select deptno, rank() over(partition by empno order by deptno) from emp
> order by row_number() over(partition by empno order by deptno.*
> The default null order is nulls last for deptno in calcite. But the null
> order still is nulls last if we set the parameter "defaultNullCollation" with
> NullCollation.LOW.
>
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