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https://issues.apache.org/jira/browse/CALCITE-883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16797938#comment-16797938
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Hongze Zhang commented on CALCITE-883:
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{quote}
with my understanding the first operand of RexOver may become a "NULL
TREATMENT" operator rather than an aggregate operator
{quote}
I think the operator "NULL TREATMENT" should not appears at Rel / Rex level.
You can translate it to a flag field of RexOver in SqlToRelConverter. See
how[1] does the converter handles aggregate calls to which {{WITHIN GROUP}} or
{{FILTER}} is used.
[1]
https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java#L4433
> RESPECT NULLS, IGNORE NULLS option for LEAD, LAG window functions
> -----------------------------------------------------------------
>
> Key: CALCITE-883
> URL: https://issues.apache.org/jira/browse/CALCITE-883
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Chunwei Lei
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> This issue was brought up in Drill community:
> (https://issues.apache.org/jira/browse/DRILL-3597)
> For convenience, I copied and pasted the reporter Khurram Faraaz's
> description here:
> "The SQL standard defines a RESPECT NULLS or IGNORE NULLS option for lead,
> lag, first_value, and last_value window functions."
> In Calcite, we should have been able to recognized this option.
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