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76 lines
2.1 KiB
SQL
76 lines
2.1 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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-- test hypertable classification when query is in an inlineable function
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\set PREFIX 'EXPLAIN (costs off)'
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CREATE TABLE test (a int, b bigint NOT NULL);
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SELECT create_hypertable('public.test', 'b', chunk_time_interval=>10);
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INSERT INTO test SELECT i, i FROM generate_series(1, 20) i;
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CREATE OR REPLACE FUNCTION test_f(_ts bigint)
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RETURNS SETOF test LANGUAGE SQL STABLE
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as $f$
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SELECT DISTINCT ON (a) * FROM test WHERE b >= _ts AND b <= _ts + 2
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$f$;
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-- plans must be the same in both cases
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-- specifically, the first plan should not contain the parent hypertable
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-- as that is a sign the pruning was not done successfully
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:PREFIX SELECT * FROM test_f(5);
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:PREFIX SELECT DISTINCT ON (a) * FROM test WHERE b >= 5 AND b <= 5 + 2;
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-- test with FOR UPDATE
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CREATE OR REPLACE FUNCTION test_f(_ts bigint)
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RETURNS SETOF test LANGUAGE SQL STABLE
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as $f$
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SELECT * FROM test WHERE b >= _ts AND b <= _ts + 2 FOR UPDATE
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$f$;
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-- pruning should not be done by TimescaleDb in this case
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-- specifically, the parent hypertable must exist in the output plan
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:PREFIX SELECT * FROM test_f(5);
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:PREFIX SELECT * FROM test WHERE b >= 5 AND b <= 5 + 2 FOR UPDATE;
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-- test with CTE
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-- these cases are just to make sure we're everything is alright with
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-- the way we identify hypertables to prune chunks - we abuse ctename
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-- for this purpose. So double-check if we're not breaking plans
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-- with CTEs here.
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CREATE OR REPLACE FUNCTION test_f(_ts bigint)
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RETURNS SETOF test LANGUAGE SQL STABLE
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as $f$
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WITH ct AS MATERIALIZED (
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SELECT DISTINCT ON (a) * FROM test WHERE b >= _ts AND b <= _ts + 2
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)
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SELECT * FROM ct
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$f$;
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:PREFIX SELECT * FROM test_f(5);
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:PREFIX
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WITH ct AS MATERIALIZED (
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SELECT DISTINCT ON (a) * FROM test WHERE b >= 5 AND b <= 5 + 2
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)
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SELECT * FROM ct;
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-- CTE within CTE
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:PREFIX
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WITH ct AS MATERIALIZED (
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SELECT * FROM test_f(5)
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)
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SELECT * FROM ct;
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-- CTE within NO MATERIALIZED CTE
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:PREFIX
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WITH ct AS NOT MATERIALIZED (
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SELECT * FROM test_f(5)
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)
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SELECT * FROM ct;
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