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https://issues.apache.org/jira/browse/DRILL-5421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16699215#comment-16699215
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Andrea Sella commented on DRILL-5421:
-------------------------------------
Any news on this? I'd avoid starting using a Deprecated class to achieve
something similar to array_agg().
> Allow Complex type as @Workspace variables for aggregate functions
> ------------------------------------------------------------------
>
> Key: DRILL-5421
> URL: https://issues.apache.org/jira/browse/DRILL-5421
> Project: Apache Drill
> Issue Type: Wish
> Components: Functions - Drill
> Affects Versions: 1.10.0
> Reporter: Manuel Aristaran
> Priority: Major
>
> I'm trying to implement the equivalent of Postgres' {{array_agg()}} as a UDF
> in Drill. Unless I'm missing something, this doesn't seem to be possible. As
> per [the
> documentation|https://drill.apache.org/docs/developing-an-aggregate-function/]:
> {quote}
> Do not use complex @Workspace variables.
> You cannot allocate a Repeated* value or have a ComplexWriter in the
> @Workspace.
> {quote}
> With that restriction, it's not possible to keep the intermediate value of
> the resulting array during computation of the aggregation.
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