29 lines
2.0 KiB
SQL
29 lines
2.0 KiB
SQL
create table parallel_hashjoin_test_a (id int);
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create table parallel_hashjoin_test_b (id int);
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insert into parallel_hashjoin_test_a select n from generate_series(1,1000) n;
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insert into parallel_hashjoin_test_b select n from generate_series(1,10) n;
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analyse parallel_hashjoin_test_a;
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analyse parallel_hashjoin_test_b;
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explain (costs off) select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10 order by parallel_hashjoin_test_a.id;
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select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10 order by parallel_hashjoin_test_a.id;
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set force_parallel_mode=on;
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set parallel_setup_cost = 1;
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set min_parallel_table_scan_size=0;
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set parallel_tuple_cost = 0.01;
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set enable_nestloop=off;
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explain (costs off) select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10 order by parallel_hashjoin_test_a.id;
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select * from parallel_hashjoin_test_a left outer join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id where parallel_hashjoin_test_a.id < 10 order by parallel_hashjoin_test_a.id;
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-- Forbid parallel Hash Right Join or Hash Full Join.
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explain (costs off)select * from parallel_hashjoin_test_a full join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id order by parallel_hashjoin_test_a.id limit 10;
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select * from parallel_hashjoin_test_a full join parallel_hashjoin_test_b on parallel_hashjoin_test_a.id = parallel_hashjoin_test_b.id order by parallel_hashjoin_test_a.id limit 10;
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drop table parallel_hashjoin_test_a;
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drop table parallel_hashjoin_test_b;
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reset parallel_setup_cost;
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reset min_parallel_table_scan_size;
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reset parallel_tuple_cost;
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reset enable_nestloop;
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reset force_parallel_mode;
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