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Currently, we never populate the errorMessage or sqlState fields of TGetOperationStatusResp when the GetOperationStatus HiveServer2 rpc is called. This patch checks if the query has an error status and if so sets errorMessage and sqlState. GetOperationStatus also now takes the QueryExecState lock since QueryExecState::query_state_ and QueryExecState::query_status_ are supposed to be protected by it. Additionally, this patch performs some cleanup and adds some documentation around our behavior for updating QueryExecState::query_state_/query_status_. This also addresses IMPALA-3298: TGetOperationStatusResp missing error message when data is expired Change-Id: Icb792f88286779fcf2ce409828de818bc4e80bed Reviewed-on: http://gerrit.cloudera.org:8080/3094 Reviewed-by: Thomas Tauber-Marshall <tmarshall@cloudera.com> Tested-by: Internal Jenkins