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This allows running *any* read-only query with mt_dop > 0. Before this patch, no joins were allowed with mt_dop > 0. Previous patches, particularly IMPALA-9156, added significantly more code coverage for multithreading+joins. It should be safe to allow enabling on a query-by-query basis. Many improvements are still planned - see IMPALA-3902. So behaviour and performance characteristics of mt_dop > 0 with more complex plans and joins will continue to change. Testing: Updated the mt_dop validation tests and remove redundant planner test that doesn't provide much additional coverage of the validation support. Ran exhaustive tests. Change-Id: I9c6566abb239db0e775f2beaa25a62c36313cd6f Reviewed-on: http://gerrit.cloudera.org:8080/15545 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
32 lines
1023 B
Plaintext
32 lines
1023 B
Plaintext
====
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---- QUERY
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# IMPALA-9099: mt_dop is now allowed for joins, so we should run with mt_dop.
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select min(l_orderkey), min(p_name)
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from tpch.lineitem join tpch.part on l_partkey = p_partkey;
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---- RESULTS
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1,'almond antique blue royal burnished'
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---- TYPES
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BIGINT,STRING
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---- RUNTIME_PROFILE
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row_regex:.*Query Options \(set by configuration and planner\):.*MT_DOP=4.*
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====
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---- QUERY
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# IMPALA-9099: mt_dop is now allowed for joins, so we should run with mt_dop.
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select min(l_orderkey), min(p_name)
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from tpch_kudu.lineitem join tpch_kudu.part on l_partkey = p_partkey;
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---- RESULTS
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1,'almond antique blue royal burnished'
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---- TYPES
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BIGINT,STRING
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---- RUNTIME_PROFILE
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row_regex:.*Query Options \(set by configuration and planner\):.*MT_DOP=4.*
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====
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---- QUERY
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create table tmp as
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select * from functional.alltypes
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---- RUNTIME_PROFILE
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row_regex:.*Query Options \(set by configuration and planner\):.*MT_DOP=0.*
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row_regex:.*All 3 execution backends \(3 fragment instances\) started.*
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row_regex:.*NumScannerThreadsStarted.*
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====
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