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https://issues.apache.org/jira/browse/HAWQ-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384860#comment-15384860
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Shivram Mani commented on HAWQ-927:
-----------------------------------
Good idea to introduce a generic struct ExternalSelectDescData to keep it
generic enough to further extend support for additional query attributes.
Can you provide an en example of the data that you plan to pass in the above to
header parameters ?
Currently column info is sent using X-GP-ATTRS (#of columns), X-GP-ATTR-NAME0,
X-GP-ATTR-NAME1... (column names).
Would be consistent if the projection info has similar naming convention with
X-GP-PROJECT-COLS indicating number of proj. columns.
> Send Projection Info Data from HAWQ to PXF
> ------------------------------------------
>
> Key: HAWQ-927
> URL: https://issues.apache.org/jira/browse/HAWQ-927
> Project: Apache HAWQ
> Issue Type: Sub-task
> Components: External Tables, PXF
> Reporter: Kavinder Dhaliwal
> Assignee: Kavinder Dhaliwal
> Fix For: backlog
>
>
> To achieve column projection at the level of PXF or the underlying readers we
> need to first send this data as a Header/Param to PXF. Currently, PXF has no
> knowledge whether a query requires all columns or a subset of columns.
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