mirror of https://github.com/citusdata/citus.git
100 lines
4.3 KiB
Plaintext
100 lines
4.3 KiB
Plaintext
CREATE SCHEMA with_partitioning;
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SET search_path TO with_partitioning, public;
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SET citus.shard_replication_factor TO 1;
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CREATE TABLE with_partitioning.local_users_2 (user_id int, event_type int);
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INSERT INTO local_users_2 VALUES (0, 0), (1, 4), (1, 7), (2, 1), (3, 3), (5, 4), (6, 2), (10, 7);
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CREATE TABLE with_partitioning.partitioning_test(id int, time date) PARTITION BY RANGE (time);
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-- create its partitions
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CREATE TABLE with_partitioning.partitioning_test_2017 PARTITION OF partitioning_test FOR VALUES FROM ('2017-01-01') TO ('2018-01-01');
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CREATE TABLE with_partitioning.partitioning_test_2010 PARTITION OF partitioning_test FOR VALUES FROM ('2010-01-01') TO ('2011-01-01');
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-- load some data and distribute tables
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INSERT INTO partitioning_test VALUES (1, '2017-11-23');
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INSERT INTO partitioning_test VALUES (2, '2010-07-07');
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INSERT INTO partitioning_test_2017 VALUES (3, '2017-11-22');
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INSERT INTO partitioning_test_2010 VALUES (4, '2010-03-03');
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-- distribute partitioned table
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SELECT create_distributed_table('with_partitioning.partitioning_test', 'id');
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NOTICE: Copying data from local table...
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NOTICE: copying the data has completed
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DETAIL: The local data in the table is no longer visible, but is still on disk.
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HINT: To remove the local data, run: SELECT truncate_local_data_after_distributing_table($$with_partitioning.partitioning_test_2010$$)
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NOTICE: Copying data from local table...
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NOTICE: copying the data has completed
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DETAIL: The local data in the table is no longer visible, but is still on disk.
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HINT: To remove the local data, run: SELECT truncate_local_data_after_distributing_table($$with_partitioning.partitioning_test_2017$$)
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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-- Join of a CTE on distributed table and then join with a partitioned table
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WITH cte AS (
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SELECT * FROM users_table
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)
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SELECT DISTINCT ON (id) id, cte.time FROM cte join partitioning_test on cte.time::date=partitioning_test.time ORDER BY 1, 2 LIMIT 3;
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id | time
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---------------------------------------------------------------------
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1 | Thu Nov 23 00:07:11.068353 2017
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3 | Wed Nov 22 18:19:49.944985 2017
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(2 rows)
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-- Join of a CTE on distributed table and then join with a partitioned table hitting on only one partition
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WITH cte AS (
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SELECT * FROM users_table
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)
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SELECT DISTINCT ON (id) id, cte.time FROM cte join partitioning_test on cte.time::date=partitioning_test.time WHERE partitioning_test.time >'2017-11-20' ORDER BY 1, 2 LIMIT 3;
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id | time
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---------------------------------------------------------------------
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1 | Thu Nov 23 00:07:11.068353 2017
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3 | Wed Nov 22 18:19:49.944985 2017
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(2 rows)
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-- Join with a distributed table and then join of two CTEs
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WITH cte AS (
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SELECT id, time FROM partitioning_test
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),
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cte_2 AS (
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SELECT * FROM partitioning_test WHERE id > 2
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),
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cte_joined AS (
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SELECT user_id, cte_2.time FROM users_table join cte_2 on (users_table.time::date = cte_2.time)
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),
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cte_joined_2 AS (
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SELECT user_id, cte_joined.time FROM cte_joined join cte on (cte_joined.time = cte.time)
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)
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SELECT DISTINCT ON (event_type) event_type, cte_joined_2.user_id FROM events_table join cte_joined_2 on (cte_joined_2.time=events_table.time::date) ORDER BY 1, 2 LIMIT 10 OFFSET 2;
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event_type | user_id
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---------------------------------------------------------------------
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2 | 1
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3 | 1
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4 | 1
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5 | 1
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(4 rows)
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-- Join a partitioned table with a local table (both in CTEs)
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-- and then with a distributed table. After all join with a
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-- partitioned table again
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WITH cte AS (
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SELECT id, time FROM partitioning_test
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),
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cte_2 AS (
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SELECT * FROM local_users_2
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),
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cte_joined AS (
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SELECT user_id, cte.time FROM cte join cte_2 on (cte.id = cte_2.user_id)
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),
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cte_joined_2 AS (
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SELECT users_table.user_id, cte_joined.time FROM cte_joined join users_table on (cte_joined.time = users_table.time::date)
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)
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SELECT DISTINCT ON (id) id, cte_joined_2.time FROM cte_joined_2 join partitioning_test on (cte_joined_2.time=partitioning_test.time) ORDER BY 1, 2;
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id | time
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---------------------------------------------------------------------
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1 | 11-23-2017
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3 | 11-22-2017
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(2 rows)
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DROP SCHEMA with_partitioning CASCADE;
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NOTICE: drop cascades to 2 other objects
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DETAIL: drop cascades to table local_users_2
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drop cascades to table partitioning_test
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