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From "Kavinder Dhaliwal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HAWQ-1409) HAWQ send additional header to PXF to indicate aggregate function type
Date Fri, 24 Mar 2017 15:15:41 GMT
Kavinder Dhaliwal created HAWQ-1409:
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             Summary: 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: Improvement
          Components: PXF
            Reporter: Kavinder Dhaliwal
            Assignee: Ed Espino
             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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