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https://issues.apache.org/jira/browse/DRILL-5421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960934#comment-15960934
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Charles Givre commented on DRILL-5421:
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I'd second this wish as well as I found this to be extremely limiting.
I was working on implementing some statistics functions (median being one of
them) and I needed a Stack in the @Workspace which did not work. I then tried
serializing the Stack as either a JSON string or in Binary only to discover
that you can't use varcharholders or varbinaryholders in the @Workspace either.
:-(
I was curious as to the reason for this restriction.
> 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
>
> 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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