102 lines
3.2 KiB
PL/PgSQL
102 lines
3.2 KiB
PL/PgSQL
-- tests for tidrangescans
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SET enable_seqscan TO off;
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CREATE TABLE tidrangescan(id integer, data text);
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-- empty table
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid < '(1, 0)';
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SELECT ctid FROM tidrangescan WHERE ctid < '(1, 0)';
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid > '(9, 0)';
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SELECT ctid FROM tidrangescan WHERE ctid > '(9, 0)';
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-- insert enough tuples to fill at least two pages
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INSERT INTO tidrangescan SELECT i,repeat('x', 100) FROM generate_series(1,200) AS s(i);
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-- remove all tuples after the 10th tuple on each page. Trying to ensure
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-- we get the same layout with all CPU architectures and smaller than standard
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-- page sizes.
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DELETE FROM tidrangescan
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WHERE substring(ctid::text FROM ',(\d+)\)')::integer > 10 OR substring(ctid::text FROM '\((\d+),')::integer > 2;
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VACUUM tidrangescan;
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-- range scans with upper bound
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid < '(1,0)';
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SELECT ctid FROM tidrangescan WHERE ctid < '(1,0)';
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid <= '(1,5)';
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SELECT ctid FROM tidrangescan WHERE ctid <= '(1,5)';
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid < '(0,0)';
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SELECT ctid FROM tidrangescan WHERE ctid < '(0,0)';
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-- range scans with lower bound
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid > '(2,8)';
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SELECT ctid FROM tidrangescan WHERE ctid > '(2,8)';
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE '(2,8)' < ctid;
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SELECT ctid FROM tidrangescan WHERE '(2,8)' < ctid;
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid >= '(2,8)';
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SELECT ctid FROM tidrangescan WHERE ctid >= '(2,8)';
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid >= '(100,0)';
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SELECT ctid FROM tidrangescan WHERE ctid >= '(100,0)';
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-- range scans with both bounds
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE ctid > '(1,4)' AND '(1,7)' >= ctid;
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SELECT ctid FROM tidrangescan WHERE ctid > '(1,4)' AND '(1,7)' >= ctid;
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EXPLAIN (COSTS OFF)
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SELECT ctid FROM tidrangescan WHERE '(1,7)' >= ctid AND ctid > '(1,4)';
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SELECT ctid FROM tidrangescan WHERE '(1,7)' >= ctid AND ctid > '(1,4)';
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-- extreme offsets
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SELECT ctid FROM tidrangescan WHERE ctid > '(0,65535)' AND ctid < '(1,0)' LIMIT 1;
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SELECT ctid FROM tidrangescan WHERE ctid < '(0,0)' LIMIT 1;
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SELECT ctid FROM tidrangescan WHERE ctid > '(4294967295,65535)';
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SELECT ctid FROM tidrangescan WHERE ctid < '(0,0)';
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-- NULLs in the range cannot return tuples
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SELECT ctid FROM tidrangescan WHERE ctid >= (SELECT NULL::tid);
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-- rescans
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EXPLAIN (COSTS OFF)
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SELECT t.ctid,t2.c FROM tidrangescan t,
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LATERAL (SELECT count(*) c FROM tidrangescan t2 WHERE t2.ctid <= t.ctid) t2
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WHERE t.ctid < '(1,0)';
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SELECT t.ctid,t2.c FROM tidrangescan t,
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LATERAL (SELECT count(*) c FROM tidrangescan t2 WHERE t2.ctid <= t.ctid) t2
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WHERE t.ctid < '(1,0)';
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-- cursors
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-- Ensure we get a TID Range scan without a Materialize node.
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EXPLAIN (COSTS OFF)
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DECLARE c SCROLL CURSOR FOR SELECT ctid FROM tidrangescan WHERE ctid < '(1,0)';
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BEGIN;
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DECLARE c SCROLL CURSOR FOR SELECT ctid FROM tidrangescan WHERE ctid < '(1,0)';
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FETCH NEXT c;
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FETCH NEXT c;
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FETCH PRIOR c;
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FETCH FIRST c;
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FETCH LAST c;
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COMMIT;
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DROP TABLE tidrangescan;
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RESET enable_seqscan;
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