mirror of
https://github.com/postgres/postgres.git
synced 2025-11-03 09:13:20 +03:00
e09b48316c
inet, cidr, and timetz indexes still cannot support index-only scans, because they don't store the original unmodified value in the index, but a derived approximate value.
38 lines
970 B
SQL
38 lines
970 B
SQL
-- char check
|
|
|
|
CREATE TABLE chartmp (a char(32));
|
|
|
|
\copy chartmp from 'data/char.data'
|
|
|
|
SET enable_seqscan=on;
|
|
|
|
SELECT count(*) FROM chartmp WHERE a < '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a <= '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a = '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a >= '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a > '31b0'::char(32);
|
|
|
|
CREATE INDEX charidx ON chartmp USING GIST ( a );
|
|
|
|
SET enable_seqscan=off;
|
|
|
|
SELECT count(*) FROM chartmp WHERE a < '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a <= '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a = '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a >= '31b0'::char(32);
|
|
|
|
SELECT count(*) FROM chartmp WHERE a > '31b0'::char(32);
|
|
|
|
-- Test index-only scans
|
|
SET enable_bitmapscan=off;
|
|
EXPLAIN (COSTS OFF)
|
|
SELECT * FROM chartmp WHERE a BETWEEN '31a' AND '31c';
|
|
SELECT * FROM chartmp WHERE a BETWEEN '31a' AND '31c';
|