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Posted to issues@hawq.apache.org by "Oleksandr Diachenko (JIRA)" <ji...@apache.org> on 2017/07/12 21:00:03 UTC

[jira] [Resolved] (HAWQ-1409) HAWQ send additional header to PXF to indicate aggregate function type

     [ https://issues.apache.org/jira/browse/HAWQ-1409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Oleksandr Diachenko resolved HAWQ-1409.
---------------------------------------
    Resolution: Fixed

> HAWQ send additional header to PXF to indicate aggregate function type
> ----------------------------------------------------------------------
>
>                 Key: HAWQ-1409
>                 URL: https://issues.apache.org/jira/browse/HAWQ-1409
>             Project: Apache HAWQ
>          Issue Type: Sub-task
>          Components: PXF
>            Reporter: Kavinder Dhaliwal
>            Assignee: Kavinder Dhaliwal
>             Fix For: 2.3.0.0-incubating
>
>
> PXF can take advantage of some file formats such as ORC and leverage the stats in the metadata. This means that for some simple aggregate functions like count, min, max without any complex joins or filters PXF can simply read the metadata and avoid reading tuples. In order for PXF to know that a query can be completed via ORC metadata HAWQ must indicate to PXF that the query is an aggregate query and the type of function



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