File: char.sql

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postgresql-13 13.16-0%2Bdeb11u1
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-- 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';