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https://issues.apache.org/jira/browse/HAWQ-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378599#comment-15378599
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ASF GitHub Bot commented on HAWQ-927:
-------------------------------------
Github user sansanichfb commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/796#discussion_r70901193
--- Diff: src/include/access/fileam.h ---
@@ -63,6 +63,17 @@ typedef struct ExternalInsertDescData
typedef ExternalInsertDescData *ExternalInsertDesc;
+/*
+ * ExternalSelectDescData is used for storing state related
+ * to selecting data from an external table.
+ */
+typedef struct ExternalSelectDescData
--- End diff --
Why do we introduce new struct if we can just use ProjectionInfo?
> 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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