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https://issues.apache.org/jira/browse/HAWQ-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384622#comment-15384622
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ASF GitHub Bot commented on HAWQ-927:
-------------------------------------
Github user shivzone commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/796#discussion_r71393037
--- Diff: src/backend/access/external/fileam.c ---
@@ -454,6 +454,21 @@ external_stopscan(FileScanDesc scan)
}
}
+/* ----------------
+ * external_getnext_init - prepare ExternalSelectDesc struct
before external_getnext
+/* ----------------
+ */
+
+ExternalSelectDesc
+external_getnext_init(PlanState *state) {
+ ExternalSelectDesc desc = (ExternalSelectDesc)
palloc0(sizeof(ExternalSelectDescData));
+ if (state != NULL && state->ps_ProjInfo != NULL) {
+ desc->projInfo = state->ps_ProjInfo;
--- End diff --
Second check is redundant
> 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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