Github user changleicn commented on the pull request:
https://github.com/apache/incubator-hawq/pull/679
Please see the doc here:
http://hdb.docs.pivotal.io/200/hawq/reference/sql/CREATE-EXTERNAL-TABLE.html
we also use external tables to execute "dbgen" command to load tpch data.
this is somewhat common from customer side when loading data.
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