[jira] [Commented] (CALCITE-969) EnumerableSort with DESC, composite reverses NULLS FIRST/LAST

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15007127#comment-15007127 ] 

Julian Hyde commented on CALCITE-969:
-------------------------------------

Changing the subject of this issue to focus on just the bug in EnumerableSort. Only occurs when sort is composite and sort item has DESC.

I have logged CALCITE-970 to deal with the other matters.

> EnumerableSort with DESC, composite reverses NULLS FIRST/LAST
> -------------------------------------------------------------
>
>                 Key: CALCITE-969
>                 URL: https://issues.apache.org/jira/browse/CALCITE-969
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: liyang
>            Assignee: Julian Hyde
>             Fix For: 1.6.0
>
>
> NULL first or NULL last is not clearly defined by sql spec, but should be consistent in calcite.
> I spot order by (A desc) returns NULL last, but order by (A desc, B) returns NULL first.
> E.g.  "select cal_dt, country, ... from xxx order by COUNTRY DESC"  returns
> 2013-08-11	US  ....
> 2013-08-18	FR  ....
> 2013-03-31	null	....
> 2013-11-10	null	....
> E.g.  "select cal_dt, country, ... from xxx order by COUNTRY DESC, CAL_DT ASC"  returns
> 2013-03-31	null	....
> 2013-11-10	null	....
> 2013-08-11	US  ....
> 2013-08-18	FR  ....



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