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Make 'col IS NULL' clauses be indexable conditions.

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Teodor Sigaev, with some kibitzing from Tom Lane.
This commit is contained in:
Tom Lane
2007-04-06 22:33:43 +00:00
parent 146c83c045
commit f02a82b6ad
19 changed files with 432 additions and 110 deletions
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46
src/test/regress/sql/create_index.sql
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@@ -96,6 +96,8 @@ SELECT * FROM fast_emp4000
SELECT count(*) FROM fast_emp4000 WHERE home_base && '(1000,1000,0,0)'::box;
SELECT count(*) FROM fast_emp4000 WHERE home_base IS NULL;
SELECT * FROM polygon_tbl WHERE f1 ~ '((1,1),(2,2),(2,1))'::polygon
ORDER BY (poly_center(f1))[0];
@@ -119,6 +121,8 @@ SELECT * FROM fast_emp4000
SELECT count(*) FROM fast_emp4000 WHERE home_base && '(1000,1000,0,0)'::box;
SELECT count(*) FROM fast_emp4000 WHERE home_base IS NULL;
SELECT * FROM polygon_tbl WHERE f1 ~ '((1,1),(2,2),(2,1))'::polygon
ORDER BY (poly_center(f1))[0];
@@ -259,3 +263,45 @@ COMMIT;
\d concur_heap
DROP TABLE concur_heap;
--
-- Tests for IS NULL with b-tree indexes
--
SELECT unique1, unique2 INTO onek_with_null FROM onek;
INSERT INTO onek_with_null (unique1,unique2) VALUES (NULL, -1), (NULL, NULL);
CREATE UNIQUE INDEX onek_nulltest ON onek_with_null (unique2,unique1);
SET enable_seqscan = OFF;
SET enable_indexscan = ON;
SET enable_bitmapscan = ON;
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL;
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL AND unique2 IS NULL;
DROP INDEX onek_nulltest;
CREATE UNIQUE INDEX onek_nulltest ON onek_with_null (unique2 desc,unique1);
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL;
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL AND unique2 IS NULL;
DROP INDEX onek_nulltest;
CREATE UNIQUE INDEX onek_nulltest ON onek_with_null (unique2 desc nulls last,unique1);
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL;
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL AND unique2 IS NULL;
DROP INDEX onek_nulltest;
CREATE UNIQUE INDEX onek_nulltest ON onek_with_null (unique2 nulls first,unique1);
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL;
SELECT count(*) FROM onek_with_null WHERE unique1 IS NULL AND unique2 IS NULL;
RESET enable_seqscan;
RESET enable_indexscan;
RESET enable_bitmapscan;
DROP TABLE onek_with_null;