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46a0cd4cef
Add WITHOUT OVERLAPS clause to PRIMARY KEY and UNIQUE constraints. These are backed by GiST indexes instead of B-tree indexes, since they are essentially exclusion constraints with = for the scalar parts of the key and && for the temporal part. Author: Paul A. Jungwirth <pj@illuminatedcomputing.com> Reviewed-by: Peter Eisentraut <peter@eisentraut.org> Reviewed-by: jian he <jian.universality@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/CA+renyUApHgSZF9-nd-a0+OPGharLQLO=mDHcY4_qQ0+noCUVg@mail.gmail.com
26 lines
868 B
SQL
26 lines
868 B
SQL
-- Core must test WITHOUT OVERLAPS
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-- with an int4range + daterange,
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-- so here we do some simple tests
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-- to make sure int + daterange works too,
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-- since that is the expected use-case.
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CREATE TABLE temporal_rng (
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id integer,
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valid_at daterange,
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CONSTRAINT temporal_rng_pk PRIMARY KEY (id, valid_at WITHOUT OVERLAPS)
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);
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\d temporal_rng
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SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
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SELECT pg_get_indexdef(conindid, 0, true) FROM pg_constraint WHERE conname = 'temporal_rng_pk';
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INSERT INTO temporal_rng VALUES
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(1, '[2000-01-01,2001-01-01)');
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-- same key, doesn't overlap:
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INSERT INTO temporal_rng VALUES
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(1, '[2001-01-01,2002-01-01)');
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-- overlaps but different key:
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INSERT INTO temporal_rng VALUES
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(2, '[2000-01-01,2001-01-01)');
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-- should fail:
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INSERT INTO temporal_rng VALUES
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(1, '[2000-06-01,2001-01-01)');
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