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https://issues.apache.org/jira/browse/HAWQ-927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Goden Yao updated HAWQ-927:
---------------------------
Fix Version/s: (was: backlog)
2.0.1.0-incubating
> 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: 2.0.1.0-incubating
>
>
> 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.
> Proposal is to send the following two attributes as part of the HTTP header
> in the Rest Api from HAWQ to PXF
> X-GP-ATTRS-PROJ - Indicates the number of attributes/columns to be projected
> X-GP-ATTRS-PROJ-IDX - Indicates the Column index(s) to be projected
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