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Posted to issues@drill.apache.org by "Andrea Sella (JIRA)" <ji...@apache.org> on 2018/11/26 16:18:00 UTC
[jira] [Commented] (DRILL-5421) Allow Complex type as @Workspace
variables for aggregate functions
[ https://issues.apache.org/jira/browse/DRILL-5421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16699215#comment-16699215 ]
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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