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The ExecutePlannedStatement interface allows an externally supplied TExecRequest to be executed by impalad. The TExecRequest must be fully populated and will be sent directly to the backend for execution. The following fields in the TExecRequest are updated by the coordinator: - Hostname - KRPC address - Local Timezone In order to add the interface to ImpalaInternalService.thrift, several of the thrift classes were moved to Query.thrift to avoid a circular dependency with Frontend.thrift. Added functionality to format and dump TExecRequest structures to path specified in debug flag dump_exec_request_path. A start timestamp field has been added to TExecRequest to represent the interval in the query profile between when the request was sent by the external frontend and handled by the backend. A local timestamp field has been added to the Ping result struct to return the current backend timestamp. This is used by the external to frontend to populate the start timestamp. Also included is a change to avoid generating silent AnalysisExceptions during table resolution. Tested with TExecRequest structures populated by external frontend. Local timezone change tested withe INT64 TIMESTAMP datatype Reviewed-by: John Sherman <jfs@cloudera.com> Change-Id: Iace716dd67290f08441857dc02d2428b0e335eaa Reviewed-on: http://gerrit.cloudera.org:8080/17104 Reviewed-by: Thomas Tauber-Marshall <tmarshall@cloudera.com> Tested-by: Thomas Tauber-Marshall <tmarshall@cloudera.com>