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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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Shivram Mani updated HAWQ-927:
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Description:
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
was: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.
> 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.
> 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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