mirror of https://github.com/citusdata/citus.git
114 lines
3.1 KiB
SQL
114 lines
3.1 KiB
SQL
SET citus.next_shard_id TO 1600000;
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\c "dbname=regression options='-c\ citus.use_secondary_nodes=always'"
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CREATE TABLE dest_table (a int, b int);
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CREATE TABLE source_table (a int, b int);
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-- attempts to change metadata should fail while reading from secondaries
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SELECT create_distributed_table('dest_table', 'a');
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\c "dbname=regression options='-c\ citus.use_secondary_nodes=never'"
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SELECT create_distributed_table('dest_table', 'a');
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SELECT create_distributed_table('source_table', 'a');
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INSERT INTO dest_table (a, b) VALUES (1, 1);
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INSERT INTO dest_table (a, b) VALUES (2, 1);
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INSERT INTO source_table (a, b) VALUES (1, 5);
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INSERT INTO source_table (a, b) VALUES (10, 10);
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-- simulate actually having secondary nodes
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SELECT nodeid, groupid, nodename, nodeport, noderack, isactive, noderole, nodecluster FROM pg_dist_node;
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UPDATE pg_dist_node SET noderole = 'secondary';
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\c "dbname=regression options='-c\ citus.use_secondary_nodes=always'"
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-- inserts are disallowed
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INSERT INTO dest_table (a, b) VALUES (1, 2);
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-- router selects are allowed
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SELECT a FROM dest_table WHERE a = 1 ORDER BY 1;
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-- real-time selects are also allowed
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SELECT a FROM dest_table ORDER BY 1;
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-- subqueries are also allowed
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SET client_min_messages TO DEBUG1;
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SELECT
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foo.a
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FROM
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(
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WITH cte AS (
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SELECT
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DISTINCT dest_table.a
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FROM
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dest_table, source_table
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WHERE
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source_table.a = dest_table.a AND
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dest_table.b IN (1,2,3,4)
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) SELECT * FROM cte ORDER BY 1 DESC LIMIT 5
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) as foo ORDER BY 1;
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-- intermediate result pruning should still work
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SET citus.log_intermediate_results TO TRUE;
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SELECT *
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FROM
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(
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WITH dest_table_cte AS (
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SELECT a
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FROM dest_table
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),
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joined_source_table_cte_1 AS (
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SELECT b, a
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FROM source_table
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INNER JOIN dest_table_cte USING (a)
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),
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joined_source_table_cte_2 AS (
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SELECT b, a
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FROM joined_source_table_cte_1
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INNER JOIN dest_table_cte USING (a)
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)
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SELECT SUM(b) OVER (PARTITION BY coalesce(a, NULL))
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FROM dest_table_cte
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INNER JOIN joined_source_table_cte_2 USING (a)
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) inner_query;
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-- confirm that the pruning works well when using round-robin as well
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SET citus.task_assignment_policy to 'round-robin';
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SELECT *
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FROM
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(
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WITH dest_table_cte AS (
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SELECT a
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FROM dest_table
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),
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joined_source_table_cte_1 AS (
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SELECT b, a
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FROM source_table
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INNER JOIN dest_table_cte USING (a)
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),
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joined_source_table_cte_2 AS (
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SELECT b, a
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FROM joined_source_table_cte_1
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INNER JOIN dest_table_cte USING (a)
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)
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SELECT SUM(b) OVER (PARTITION BY coalesce(a, NULL))
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FROM dest_table_cte
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INNER JOIN joined_source_table_cte_2 USING (a)
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) inner_query;
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SET citus.task_assignment_policy to DEFAULT;
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SET client_min_messages TO DEFAULT;
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SET citus.log_intermediate_results TO DEFAULT;
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-- insert into is definitely not allowed
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INSERT INTO dest_table (a, b)
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SELECT a, b FROM source_table;
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\c "dbname=regression options='-c\ citus.use_secondary_nodes=never'"
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UPDATE pg_dist_node SET noderole = 'primary';
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DROP TABLE source_table, dest_table;
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