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From "Manuel Aristaran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-5421) Allow Complex type as @Workspace variables for aggregate functions
Date Thu, 06 Apr 2017 23:30:42 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Manuel Aristaran updated DRILL-5421:
------------------------------------
    Description: 
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.




  was:
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.





> 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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