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https://issues.apache.org/jira/browse/HAWQ-927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378652#comment-15378652
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ASF GitHub Bot commented on HAWQ-927:
-------------------------------------
Github user kavinderd commented on a diff in the pull request:
https://github.com/apache/incubator-hawq/pull/796#discussion_r70905516
--- Diff: src/backend/access/external/pxfheaders.c ---
@@ -158,6 +165,29 @@ static void add_tuple_desc_httpheader(CHURL_HEADERS
headers, Relation rel)
pfree(formatter.data);
}
+static void add_projection_desc_httpheader(CHURL_HEADERS headers,
ProjectionInfo *projInfo) {
+ int i;
+ char long_number[32];
--- End diff --
Since we are converting `list_length(projInfo->pi_targetlist)`, we need an
array thats 32 chars long to match the bit length of `int`.
> 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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