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https://issues.apache.org/jira/browse/FLINK-4262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15405572#comment-15405572
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Timo Walther commented on FLINK-4262:
-------------------------------------
I think this issue is bit tricky as the position of {{null}} values is
determined by the {{RowComparator}}. So multiple layers have to be touched for
this change.
> Consider null handling during sorting
> -------------------------------------
>
> Key: FLINK-4262
> URL: https://issues.apache.org/jira/browse/FLINK-4262
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
> Priority: Minor
>
> Calcite's SQL parser allows to specify how to handle NULLs during sorting.
> {code}
> orderItem:
> expression [ ASC | DESC ] [ NULLS FIRST | NULLS LAST ]
> {code}
> Currently, the NULL FIRST/NULLS LAST is completely ignored but might be
> helpful.
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