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In every execution of an Impala query, one of the impalad daemons acts as the coordinator node. In some cases, such as when using a proxy, a user cannot predict which host will act as the coordinator. To aid in diagnosis, we provide a sql function which returns the name of the host on which the coordinator is running. EXTERNAL DESCRIPTION: Add a builtin function called coordinator(), which returns the name of the host which is running the impalad that is acting as the coordinator for the current query. TESTING: - Added a basic unit test for the new function. - Added a unit test which simulates the case when coord_address is unset. - Added a query that uses coordinator() to exprs.test - Hand tested in a development deployment. - Ran regression tests and got a clean run. Change-Id: I94d6e2664ba659b48df53c5c06f67b502c533e47 Reviewed-on: http://gerrit.cloudera.org:8080/11459 Reviewed-by: Thomas Marshall <thomasmarshall@cmu.edu> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>