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?
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