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57e3c5160b
Adds bool opclass to btree_gist extension, to allow creating GiST indexes on bool columns. GiST indexes on a single bool column don't seem particularly useful, but this allows defining exclusion constraings involving a bool column, for example. Author: Emre Hasegeli Reviewed-by: Andrey Borodin Discussion: https://postgr.es/m/CAE2gYzyDKJBZngssR84VGZEN=Ux=V9FV23QfPgo+7-yYnKKg4g@mail.gmail.com
97 lines
1.5 KiB
Plaintext
97 lines
1.5 KiB
Plaintext
-- bool check
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CREATE TABLE booltmp (a bool);
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INSERT INTO booltmp VALUES (false), (true);
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SET enable_seqscan=on;
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SELECT count(*) FROM booltmp WHERE a < true;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM booltmp WHERE a <= true;
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count
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-------
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2
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(1 row)
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SELECT count(*) FROM booltmp WHERE a = true;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM booltmp WHERE a >= true;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM booltmp WHERE a > true;
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count
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-------
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0
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(1 row)
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CREATE INDEX boolidx ON booltmp USING gist ( a );
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SET enable_seqscan=off;
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SELECT count(*) FROM booltmp WHERE a < true;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM booltmp WHERE a <= true;
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count
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-------
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2
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(1 row)
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SELECT count(*) FROM booltmp WHERE a = true;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM booltmp WHERE a >= true;
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count
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-------
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1
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(1 row)
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SELECT count(*) FROM booltmp WHERE a > true;
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count
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-------
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0
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(1 row)
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-- Test index-only scans
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SET enable_bitmapscan=off;
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EXPLAIN (COSTS OFF)
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SELECT * FROM booltmp WHERE a;
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QUERY PLAN
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------------------------------------------
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Index Only Scan using boolidx on booltmp
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Filter: a
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(2 rows)
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SELECT * FROM booltmp WHERE a;
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a
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---
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t
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(1 row)
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EXPLAIN (COSTS OFF)
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SELECT * FROM booltmp WHERE NOT a;
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QUERY PLAN
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------------------------------------------
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Index Only Scan using boolidx on booltmp
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Filter: (NOT a)
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(2 rows)
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SELECT * FROM booltmp WHERE NOT a;
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a
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---
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f
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(1 row)
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