mirror of https://github.com/citusdata/citus.git
578 lines
24 KiB
Plaintext
578 lines
24 KiB
Plaintext
-- Test functions for copying intermediate results
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CREATE SCHEMA intermediate_results;
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SET search_path TO 'intermediate_results';
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-- helper udfs
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CREATE OR REPLACE FUNCTION pg_catalog.store_intermediate_result_on_node(nodename text, nodeport int, result_id text, query text)
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RETURNS void
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LANGUAGE C STRICT VOLATILE
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AS 'citus', $$store_intermediate_result_on_node$$;
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-- in the same transaction we can read a result
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BEGIN;
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SELECT create_intermediate_result('squares', 'SELECT s, s*s FROM generate_series(1,5) s');
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create_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x int, x2 int);
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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4 | 16
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5 | 25
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(5 rows)
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COMMIT;
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-- in separate transactions, the result is no longer available
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SELECT create_intermediate_result('squares', 'SELECT s, s*s FROM generate_series(1,5) s');
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create_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x int, x2 int);
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WARNING: Query could not find the intermediate result file "squares", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
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x | x2
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---------------------------------------------------------------------
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(0 rows)
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BEGIN;
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CREATE TABLE interesting_squares (user_id text, interested_in text);
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SELECT create_distributed_table('interesting_squares', 'user_id');
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create_distributed_table
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---------------------------------------------------------------------
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(1 row)
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INSERT INTO interesting_squares VALUES ('jon', '2'), ('jon', '5'), ('jack', '3');
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-- put an intermediate result on all workers
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SELECT broadcast_intermediate_result('squares', 'SELECT s, s*s FROM generate_series(1,5) s');
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broadcast_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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-- query the intermediate result in a router query
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SELECT x, x2
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FROM interesting_squares JOIN (SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x int, x2 int)) squares ON (x::text = interested_in)
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WHERE user_id = 'jon'
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ORDER BY x;
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x | x2
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---------------------------------------------------------------------
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2 | 4
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5 | 25
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(2 rows)
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END;
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BEGIN;
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-- put an intermediate result on all workers
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SELECT broadcast_intermediate_result('squares', 'SELECT s, s*s FROM generate_series(1,5) s');
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broadcast_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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-- query the intermediate result in a distributed query
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SELECT x, x2
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FROM interesting_squares
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JOIN (SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x int, x2 int)) squares ON (x::text = interested_in)
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ORDER BY x;
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x | x2
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---------------------------------------------------------------------
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2 | 4
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3 | 9
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5 | 25
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(3 rows)
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END;
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-- files should now be cleaned up
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SET client_min_messages TO DEBUG;
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SELECT x, x2
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FROM interesting_squares JOIN (SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x text, x2 int)) squares ON (x = interested_in)
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WHERE user_id = 'jon' OR true
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ORDER BY x;
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DEBUG: Router planner cannot handle multi-shard select queries
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ERROR: Query could not find the intermediate result file "squares", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
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SET client_min_messages TO DEBUG;
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SELECT x, x2
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FROM interesting_squares JOIN (SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x text, x2 int)) squares ON (x = interested_in)
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WHERE user_id = 'jon'
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ORDER BY x;
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DEBUG: Creating router plan
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DEBUG: query has a single distribution column value: jon
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ERROR: Query could not find the intermediate result file "squares", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
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RESET client_min_messages;
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-- try to read the file as text, will fail because of binary encoding
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BEGIN;
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SELECT create_intermediate_result('squares', 'SELECT s, s*s FROM generate_series(1,5) s');
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create_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x text, x2 int);
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ERROR: invalid byte sequence for encoding "UTF8": 0x00
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END;
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-- try to read the file with wrong encoding
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BEGIN;
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SELECT create_intermediate_result('squares', 'SELECT s, s*s FROM generate_series(1,5) s');
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create_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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SELECT * FROM read_intermediate_result('squares', 'csv') AS res (x int, x2 int);
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ERROR: invalid input syntax for integer: "PGCOPY"
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END;
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-- try a composite type
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CREATE TYPE intermediate_results.square_type AS (x text, x2 int);
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CREATE TABLE stored_squares (user_id text, square intermediate_results.square_type, metadata jsonb);
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INSERT INTO stored_squares VALUES ('jon', '(2,4)'::intermediate_results.square_type, '{"value":2}');
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INSERT INTO stored_squares VALUES ('jon', '(3,9)'::intermediate_results.square_type, '{"value":3}');
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INSERT INTO stored_squares VALUES ('jon', '(4,16)'::intermediate_results.square_type, '{"value":4}');
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INSERT INTO stored_squares VALUES ('jon', '(5,25)'::intermediate_results.square_type, '{"value":5}');
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-- composite types change the format to text
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BEGIN;
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SELECT create_intermediate_result('stored_squares', 'SELECT square FROM stored_squares');
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create_intermediate_result
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---------------------------------------------------------------------
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4
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(1 row)
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SELECT * FROM read_intermediate_result('stored_squares', 'binary') AS res (s intermediate_results.square_type);
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ERROR: COPY file signature not recognized
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COMMIT;
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BEGIN;
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SELECT create_intermediate_result('stored_squares', 'SELECT square FROM stored_squares');
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create_intermediate_result
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---------------------------------------------------------------------
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4
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(1 row)
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SELECT * FROM read_intermediate_result('stored_squares', 'text') AS res (s intermediate_results.square_type);
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s
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---------------------------------------------------------------------
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(2,4)
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(3,9)
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(4,16)
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(5,25)
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(4 rows)
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COMMIT;
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BEGIN;
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-- put an intermediate result in text format on all workers
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SELECT broadcast_intermediate_result('stored_squares', 'SELECT square, metadata FROM stored_squares');
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broadcast_intermediate_result
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---------------------------------------------------------------------
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4
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(1 row)
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-- query the intermediate result in a router query using text format
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SELECT * FROM interesting_squares JOIN (
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SELECT * FROM
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read_intermediate_result('stored_squares', 'text') AS res (s intermediate_results.square_type, m jsonb)
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) squares
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ON ((s).x = interested_in) WHERE user_id = 'jon' ORDER BY 1,2;
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user_id | interested_in | s | m
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---------------------------------------------------------------------
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jon | 2 | (2,4) | {"value": 2}
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jon | 5 | (5,25) | {"value": 5}
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(2 rows)
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-- query the intermediate result in a real-time query using text format
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SELECT * FROM interesting_squares JOIN (
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SELECT * FROM
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read_intermediate_result('stored_squares', 'text') AS res (s intermediate_results.square_type, m jsonb)
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) squares
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ON ((s).x = interested_in) ORDER BY 1,2;
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user_id | interested_in | s | m
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---------------------------------------------------------------------
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jack | 3 | (3,9) | {"value": 3}
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jon | 2 | (2,4) | {"value": 2}
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jon | 5 | (5,25) | {"value": 5}
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(3 rows)
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END;
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BEGIN;
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-- accurate row count estimates for primitive types
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SELECT create_intermediate_result('squares', 'SELECT s, s*s FROM generate_series(1,632) s');
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create_intermediate_result
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---------------------------------------------------------------------
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632
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(1 row)
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EXPLAIN (COSTS ON) SELECT * FROM read_intermediate_result('squares', 'binary') AS res (x int, x2 int);
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QUERY PLAN
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---------------------------------------------------------------------
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Function Scan on read_intermediate_result res (cost=0.00..4.55 rows=632 width=8)
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(1 row)
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-- less accurate results for variable types
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SELECT create_intermediate_result('hellos', $$SELECT s, 'hello-'||s FROM generate_series(1,63) s$$);
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create_intermediate_result
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---------------------------------------------------------------------
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63
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(1 row)
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EXPLAIN (COSTS ON) SELECT * FROM read_intermediate_result('hellos', 'binary') AS res (x int, y text);
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QUERY PLAN
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---------------------------------------------------------------------
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Function Scan on read_intermediate_result res (cost=0.00..0.32 rows=30 width=36)
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(1 row)
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-- not very accurate results for text encoding
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SELECT create_intermediate_result('stored_squares', 'SELECT square FROM stored_squares');
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create_intermediate_result
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---------------------------------------------------------------------
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4
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(1 row)
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EXPLAIN (COSTS ON) SELECT * FROM read_intermediate_result('stored_squares', 'text') AS res (s intermediate_results.square_type);
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QUERY PLAN
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---------------------------------------------------------------------
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Function Scan on read_intermediate_result res (cost=0.00..0.01 rows=1 width=32)
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(1 row)
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END;
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-- pipe query output into a result file and create a table to check the result
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COPY (SELECT s, s*s FROM generate_series(1,5) s)
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TO PROGRAM
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$$psql -h localhost -p 57636 -U postgres -d regression -c "BEGIN; COPY squares FROM STDIN WITH (format result); CREATE TABLE intermediate_results.squares AS SELECT * FROM read_intermediate_result('squares', 'text') AS res(x int, x2 int); END;"$$
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WITH (FORMAT text);
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SELECT * FROM squares ORDER BY x;
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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4 | 16
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5 | 25
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(5 rows)
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-- cannot use DDL commands
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select broadcast_intermediate_result('a', 'create table foo(int serial)');
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ERROR: cannot execute utility commands
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select broadcast_intermediate_result('a', 'prepare foo as select 1');
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ERROR: cannot execute utility commands
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select create_intermediate_result('a', 'create table foo(int serial)');
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ERROR: cannot execute utility commands
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--
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-- read_intermediate_results
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--
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BEGIN;
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SELECT create_intermediate_result('squares_1', 'SELECT s, s*s FROM generate_series(1,3) s'),
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create_intermediate_result('squares_2', 'SELECT s, s*s FROM generate_series(4,6) s'),
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create_intermediate_result('squares_3', 'SELECT s, s*s FROM generate_series(7,10) s');
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create_intermediate_result | create_intermediate_result | create_intermediate_result
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---------------------------------------------------------------------
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3 | 3 | 4
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(1 row)
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SELECT count(*) FROM read_intermediate_results(ARRAY[]::text[], 'binary') AS res (x int, x2 int);
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count
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---------------------------------------------------------------------
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0
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(1 row)
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SELECT * FROM read_intermediate_results(ARRAY['squares_1']::text[], 'binary') AS res (x int, x2 int);
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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(3 rows)
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SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'squares_2', 'squares_3']::text[], 'binary') AS res (x int, x2 int);
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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4 | 16
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5 | 25
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6 | 36
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7 | 49
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8 | 64
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9 | 81
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10 | 100
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(10 rows)
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COMMIT;
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-- in separate transactions, the result is no longer available
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SELECT create_intermediate_result('squares_1', 'SELECT s, s*s FROM generate_series(1,5) s');
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create_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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SELECT * FROM read_intermediate_results(ARRAY['squares_1']::text[], 'binary') AS res (x int, x2 int);
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WARNING: Query could not find the intermediate result file "squares_1", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
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x | x2
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---------------------------------------------------------------------
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(0 rows)
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-- error behaviour, and also check that results are deleted on rollback
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BEGIN;
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SELECT create_intermediate_result('squares_1', 'SELECT s, s*s FROM generate_series(1,3) s');
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create_intermediate_result
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---------------------------------------------------------------------
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3
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(1 row)
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SAVEPOINT s1;
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SELECT * FROM read_intermediate_results(ARRAY['notexistingfile', 'squares_1'], 'binary') AS res (x int, x2 int);
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WARNING: Query could not find the intermediate result file "notexistingfile", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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(3 rows)
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ROLLBACK TO SAVEPOINT s1;
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SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'notexistingfile'], 'binary') AS res (x int, x2 int);
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WARNING: Query could not find the intermediate result file "notexistingfile", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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(3 rows)
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ROLLBACK TO SAVEPOINT s1;
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SELECT * FROM read_intermediate_results(ARRAY['squares_1', NULL], 'binary') AS res (x int, x2 int);
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ERROR: null array element not allowed in this context
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ROLLBACK TO SAVEPOINT s1;
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-- after rollbacks we should be able to run vail read_intermediate_results still.
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SELECT count(*) FROM read_intermediate_results(ARRAY['squares_1']::text[], 'binary') AS res (x int, x2 int);
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count
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---------------------------------------------------------------------
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3
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(1 row)
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SELECT count(*) FROM read_intermediate_results(ARRAY[]::text[], 'binary') AS res (x int, x2 int);
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count
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---------------------------------------------------------------------
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0
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(1 row)
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END;
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SELECT * FROM read_intermediate_results(ARRAY['squares_1']::text[], 'binary') AS res (x int, x2 int);
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WARNING: Query could not find the intermediate result file "squares_1", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
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x | x2
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---------------------------------------------------------------------
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(0 rows)
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-- Test non-binary format: read_intermediate_results(..., 'text')
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BEGIN;
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-- ROW(...) types switch the output format to text
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SELECT broadcast_intermediate_result('stored_squares_1',
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'SELECT s, s*s, ROW(1::text, 2) FROM generate_series(1,3) s'),
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broadcast_intermediate_result('stored_squares_2',
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'SELECT s, s*s, ROW(2::text, 3) FROM generate_series(4,6) s');
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broadcast_intermediate_result | broadcast_intermediate_result
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---------------------------------------------------------------------
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3 | 3
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(1 row)
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-- query the intermediate result in a router query using text format
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SELECT * FROM interesting_squares JOIN (
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SELECT * FROM
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read_intermediate_results(ARRAY['stored_squares_1', 'stored_squares_2'], 'text') AS res (x int, x2 int, z intermediate_results.square_type)
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) squares
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ON (squares.x::text = interested_in) WHERE user_id = 'jon' ORDER BY 1,2;
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user_id | interested_in | x | x2 | z
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---------------------------------------------------------------------
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jon | 2 | 2 | 4 | (1,2)
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jon | 5 | 5 | 25 | (2,3)
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(2 rows)
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END;
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-- Cost estimation for read_intermediate_results
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BEGIN;
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-- almost accurate row count estimates for primitive types
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SELECT create_intermediate_result('squares_1', 'SELECT s, s*s FROM generate_series(1,632) s'),
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create_intermediate_result('squares_2', 'SELECT s, s*s FROM generate_series(633,1024) s');
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create_intermediate_result | create_intermediate_result
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---------------------------------------------------------------------
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632 | 392
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(1 row)
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EXPLAIN (COSTS ON) SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'squares_2'], 'binary') AS res (x int, x2 int);
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QUERY PLAN
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---------------------------------------------------------------------
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Function Scan on read_intermediate_results res (cost=0.00..7.37 rows=1024 width=8)
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(1 row)
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-- less accurate results for variable types
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SELECT create_intermediate_result('hellos_1', $$SELECT s, 'hello-'||s FROM generate_series(1,63) s$$),
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create_intermediate_result('hellos_2', $$SELECT s, 'hello-'||s FROM generate_series(64,129) s$$);
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create_intermediate_result | create_intermediate_result
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---------------------------------------------------------------------
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63 | 66
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(1 row)
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EXPLAIN (COSTS ON) SELECT * FROM read_intermediate_results(ARRAY['hellos_1', 'hellos_2'], 'binary') AS res (x int, y text);
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QUERY PLAN
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---------------------------------------------------------------------
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Function Scan on read_intermediate_results res (cost=0.00..0.66 rows=62 width=36)
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(1 row)
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-- not very accurate results for text encoding
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SELECT create_intermediate_result('stored_squares', 'SELECT square FROM stored_squares');
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create_intermediate_result
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---------------------------------------------------------------------
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4
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(1 row)
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EXPLAIN (COSTS ON) SELECT * FROM read_intermediate_results(ARRAY['stored_squares'], 'text') AS res (s intermediate_results.square_type);
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QUERY PLAN
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---------------------------------------------------------------------
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Function Scan on read_intermediate_results res (cost=0.00..0.01 rows=1 width=32)
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(1 row)
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END;
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--
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-- fetch_intermediate_results
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--
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-- straightforward, single-result case
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BEGIN;
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SELECT broadcast_intermediate_result('squares_1', 'SELECT s, s*s FROM generate_series(1, 5) s');
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broadcast_intermediate_result
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---------------------------------------------------------------------
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5
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(1 row)
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SELECT * FROM fetch_intermediate_results(ARRAY['squares_1']::text[], 'localhost', :worker_2_port);
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fetch_intermediate_results
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---------------------------------------------------------------------
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111
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(1 row)
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SELECT * FROM read_intermediate_result('squares_1', 'binary') AS res (x int, x2 int);
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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4 | 16
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5 | 25
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(5 rows)
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SELECT * FROM fetch_intermediate_results(ARRAY['squares_1']::text[], 'localhost', :worker_1_port);
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fetch_intermediate_results
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---------------------------------------------------------------------
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111
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(1 row)
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SELECT * FROM read_intermediate_result('squares_1', 'binary') AS res (x int, x2 int);
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x | x2
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---------------------------------------------------------------------
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1 | 1
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2 | 4
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3 | 9
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4 | 16
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5 | 25
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(5 rows)
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END;
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-- multiple results, and some error cases
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BEGIN;
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SELECT store_intermediate_result_on_node('localhost', :worker_1_port,
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'squares_1', 'SELECT s, s*s FROM generate_series(1, 2) s');
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store_intermediate_result_on_node
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|
---------------------------------------------------------------------
|
|
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(1 row)
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|
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SELECT store_intermediate_result_on_node('localhost', :worker_1_port,
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'squares_2', 'SELECT s, s*s FROM generate_series(3, 4) s');
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|
store_intermediate_result_on_node
|
|
---------------------------------------------------------------------
|
|
|
|
(1 row)
|
|
|
|
SAVEPOINT s1;
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|
-- results aren't available on coordinator yet
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|
SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'binary') AS res (x int, x2 int);
|
|
WARNING: Query could not find the intermediate result file "squares_1", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
|
|
WARNING: Query could not find the intermediate result file "squares_2", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
|
|
x | x2
|
|
---------------------------------------------------------------------
|
|
(0 rows)
|
|
|
|
ROLLBACK TO SAVEPOINT s1;
|
|
-- fetch from invalid worker port should fail
|
|
SELECT * FROM fetch_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'localhost', 57635);
|
|
ERROR: cannot connect to localhost:xxxxx to fetch intermediate results
|
|
ROLLBACK TO SAVEPOINT s1;
|
|
-- still, results aren't available on coordinator yet
|
|
SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'binary') AS res (x int, x2 int);
|
|
WARNING: Query could not find the intermediate result file "squares_1", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
|
|
WARNING: Query could not find the intermediate result file "squares_2", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
|
|
x | x2
|
|
---------------------------------------------------------------------
|
|
(0 rows)
|
|
|
|
ROLLBACK TO SAVEPOINT s1;
|
|
-- fetch from worker 1 should succeed
|
|
SELECT * FROM fetch_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'localhost', :worker_1_port);
|
|
fetch_intermediate_results
|
|
---------------------------------------------------------------------
|
|
114
|
|
(1 row)
|
|
|
|
SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'binary') AS res (x int, x2 int);
|
|
x | x2
|
|
---------------------------------------------------------------------
|
|
1 | 1
|
|
2 | 4
|
|
3 | 9
|
|
4 | 16
|
|
(4 rows)
|
|
|
|
-- fetching again should succeed
|
|
SELECT * FROM fetch_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'localhost', :worker_1_port);
|
|
fetch_intermediate_results
|
|
---------------------------------------------------------------------
|
|
114
|
|
(1 row)
|
|
|
|
SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'binary') AS res (x int, x2 int);
|
|
x | x2
|
|
---------------------------------------------------------------------
|
|
1 | 1
|
|
2 | 4
|
|
3 | 9
|
|
4 | 16
|
|
(4 rows)
|
|
|
|
ROLLBACK TO SAVEPOINT s1;
|
|
-- empty result id list should succeed
|
|
SELECT * FROM fetch_intermediate_results(ARRAY[]::text[], 'localhost', :worker_1_port);
|
|
fetch_intermediate_results
|
|
---------------------------------------------------------------------
|
|
0
|
|
(1 row)
|
|
|
|
-- null in result id list should error gracefully
|
|
SELECT * FROM fetch_intermediate_results(ARRAY[NULL, 'squares_1', 'squares_2']::text[], 'localhost', :worker_1_port);
|
|
ERROR: worker array object cannot contain null values
|
|
END;
|
|
-- results should have been deleted after transaction commit
|
|
SELECT * FROM read_intermediate_results(ARRAY['squares_1', 'squares_2']::text[], 'binary') AS res (x int, x2 int);
|
|
WARNING: Query could not find the intermediate result file "squares_1", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
|
|
WARNING: Query could not find the intermediate result file "squares_2", it was mostly likely deleted due to an error in a parallel process within the same distributed transaction
|
|
x | x2
|
|
---------------------------------------------------------------------
|
|
(0 rows)
|
|
|
|
DROP SCHEMA intermediate_results CASCADE;
|
|
NOTICE: drop cascades to 4 other objects
|
|
DETAIL: drop cascades to table interesting_squares
|
|
drop cascades to type square_type
|
|
drop cascades to table stored_squares
|
|
drop cascades to table squares
|