Github user sansanichfb commented on a diff in the pull request:
https://github.com/apache/incubator-hawq-docs/pull/94#discussion_r99970872
--- Diff: markdown/pxf/ReadWritePXF.html.md.erb ---
@@ -131,6 +149,8 @@ Note: The <code class="ph codeph">DELIMITER</code>
parameter is mandatory.
</tbody>
</table>
+**Notes**: Metadata identifies the Java class that provides field
definitions in the relation. OutputFormat identifies the file format for which
a specific profile is optimized. While the built-in `Hive*` profiles provide
Metadata and OutputFormat classes, most profiles will have no need to implement
or specify these classes.
--- End diff --
We can probably mention that PXF service can produce data in different
formats - TEXT, GPDBWritable, and outputFormat property means given profile
optimized for particular output format(TEXT/GPDBWritable).
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