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IMPALA-12056 enable child query to unset REQUEST_POOL if it is set by Frontend.java as part of executor group selection. However, the implementation miss to setRequest_pool_set_by_frontend(false) if REQUEST_POOL is explicitly set by client request through impala-shell configuration. This cause child query to always unset REQUEST_POOL if parent query was executed via impala-shell. This patch fix the issue by checking query options that comes from client. This patch also tidy up null and empty REQUEST_POOL checking by using StringUtils.isNotEmpty(). Testing: - Add testcase in test_query_cpu_count_divisor_default Change-Id: Ib5036859d51bc64f568da405f730c8f3ffebb742 Reviewed-on: http://gerrit.cloudera.org:8080/20189 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Riza Suminto <riza.suminto@cloudera.com>