mirror of https://github.com/citusdata/citus.git
125 lines
4.3 KiB
Plaintext
125 lines
4.3 KiB
Plaintext
CREATE SCHEMA adaptive_executor;
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SET search_path TO adaptive_executor;
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SET citus.task_executor_type to 'adaptive';
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SET citus.shard_replication_factor to 1;
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SET citus.enable_repartition_joins TO true;
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CREATE TABLE ab(a int, b int);
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SELECT create_distributed_table('ab', 'a');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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INSERT INTO ab SELECT *,* FROM generate_series(1,10);
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SELECT COUNT(*) FROM ab k, ab l
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WHERE k.a = l.b;
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count
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---------------------------------------------------------------------
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10
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(1 row)
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SELECT COUNT(*) FROM ab k, ab l, ab m, ab t
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WHERE k.a = l.b AND k.a = m.b AND t.b = l.a;
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count
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---------------------------------------------------------------------
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10
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(1 row)
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SELECT count(*) FROM (SELECT k.a FROM ab k, ab l WHERE k.a = l.b) first, (SELECT * FROM ab) second WHERE first.a = second.b;
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count
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---------------------------------------------------------------------
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10
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(1 row)
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BEGIN;
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SELECT count(*) FROM (SELECT k.a FROM ab k, ab l WHERE k.a = l.b) first, (SELECT * FROM ab) second WHERE first.a = second.b;
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count
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---------------------------------------------------------------------
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10
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(1 row)
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SELECT count(*) FROM (SELECT k.a FROM ab k, ab l WHERE k.a = l.b) first, (SELECT * FROM ab) second WHERE first.a = second.b;
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count
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---------------------------------------------------------------------
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10
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(1 row)
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SELECT count(*) FROM (SELECT k.a FROM ab k, ab l WHERE k.a = l.b) first, (SELECT * FROM ab) second WHERE first.a = second.b;
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count
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---------------------------------------------------------------------
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10
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(1 row)
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ROLLBACK;
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BEGIN;
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INSERT INTO ab values(1, 2);
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-- DDL happened before repartition query in a transaction block, so this should error.
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SELECT count(*) FROM (SELECT k.a FROM ab k, ab l WHERE k.a = l.b) first, (SELECT * FROM ab) second WHERE first.a = second.b;
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ERROR: cannot open new connections after the first modification command within a transaction
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ROLLBACK;
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SET citus.enable_single_hash_repartition_joins TO ON;
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CREATE TABLE single_hash_repartition_first (id int, sum int, avg float);
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CREATE TABLE single_hash_repartition_second (id int, sum int, avg float);
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CREATE TABLE ref_table (id int, sum int, avg float);
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SELECT create_distributed_table('single_hash_repartition_first', 'id');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_distributed_table('single_hash_repartition_second', 'id');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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SELECT create_reference_table('ref_table');
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create_reference_table
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---------------------------------------------------------------------
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(1 row)
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-- single hash repartition after bcast joins
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EXPLAIN SELECT
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count(*)
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FROM
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ref_table r1, single_hash_repartition_second t1, single_hash_repartition_first t2
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WHERE
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r1.id = t1.id AND t2.sum = t1.id;
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QUERY PLAN
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---------------------------------------------------------------------
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Aggregate (cost=0.00..0.00 rows=0 width=0)
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-> Custom Scan (Citus Adaptive) (cost=0.00..0.00 rows=0 width=0)
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Task Count: 4
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Tasks Shown: None, not supported for re-partition queries
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-> MapMergeJob
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Map Task Count: 4
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Merge Task Count: 4
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(7 rows)
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-- a more complicated join order, first colocated join, later single hash repartition join
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EXPLAIN SELECT
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count(*)
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FROM
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single_hash_repartition_first t1, single_hash_repartition_first t2, single_hash_repartition_second t3
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WHERE
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t1.id = t2.id AND t1.sum = t3.id;
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QUERY PLAN
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---------------------------------------------------------------------
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Aggregate (cost=0.00..0.00 rows=0 width=0)
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-> Custom Scan (Citus Adaptive) (cost=0.00..0.00 rows=0 width=0)
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Task Count: 4
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Tasks Shown: None, not supported for re-partition queries
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-> MapMergeJob
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Map Task Count: 4
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Merge Task Count: 4
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(7 rows)
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SET citus.enable_single_hash_repartition_joins TO OFF;
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DROP SCHEMA adaptive_executor CASCADE;
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NOTICE: drop cascades to 4 other objects
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DETAIL: drop cascades to table ab
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drop cascades to table single_hash_repartition_first
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drop cascades to table single_hash_repartition_second
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drop cascades to table ref_table
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