Manuel Aristaran created DRILL-5421:
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Summary: 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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