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Stabilize contrib/seg regression test.

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If autovacuum comes along just after we fill table test_seg with
some data, it will update the stats to the point where we prefer
a plain indexscan over a bitmap scan, breaking the expected
output (as well as the point of the test case).  To fix, just
force a bitmap scan to be chosen here.

This has evidently been wrong since commit de1d042f5.  It's not
clear why we just recently saw any buildfarm failures due to it;
but prairiedog has failed twice on this test in the past week.
Hence, backpatch to v11 where this test case came in.
This commit is contained in:
Tom Lane 2021-06-07 14:52:42 -04:00
parent 5b64368742
commit eed17f39fa
2 changed files with 4 additions and 0 deletions
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2
contrib/seg/expected/seg.out
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@ -930,6 +930,7 @@ SELECT '1'::seg <@ '-1 .. 1'::seg AS bool;
CREATE TABLE test_seg (s seg); CREATE TABLE test_seg (s seg);
\copy test_seg from 'data/test_seg.data' \copy test_seg from 'data/test_seg.data'
CREATE INDEX test_seg_ix ON test_seg USING gist (s); CREATE INDEX test_seg_ix ON test_seg USING gist (s);
SET enable_indexscan = false;
EXPLAIN (COSTS OFF) EXPLAIN (COSTS OFF)
SELECT count(*) FROM test_seg WHERE s @> '11..11.3'; SELECT count(*) FROM test_seg WHERE s @> '11..11.3';
QUERY PLAN QUERY PLAN
@ -947,6 +948,7 @@ SELECT count(*) FROM test_seg WHERE s @> '11..11.3';
143 143
(1 row) (1 row)
RESET enable_indexscan;
SET enable_bitmapscan = false; SET enable_bitmapscan = false;
EXPLAIN (COSTS OFF) EXPLAIN (COSTS OFF)
SELECT count(*) FROM test_seg WHERE s @> '11..11.3'; SELECT count(*) FROM test_seg WHERE s @> '11..11.3';

2
contrib/seg/sql/seg.sql
View File

@ -217,9 +217,11 @@ CREATE TABLE test_seg (s seg);
CREATE INDEX test_seg_ix ON test_seg USING gist (s); CREATE INDEX test_seg_ix ON test_seg USING gist (s);
SET enable_indexscan = false;
EXPLAIN (COSTS OFF) EXPLAIN (COSTS OFF)
SELECT count(*) FROM test_seg WHERE s @> '11..11.3'; SELECT count(*) FROM test_seg WHERE s @> '11..11.3';
SELECT count(*) FROM test_seg WHERE s @> '11..11.3'; SELECT count(*) FROM test_seg WHERE s @> '11..11.3';
RESET enable_indexscan;
SET enable_bitmapscan = false; SET enable_bitmapscan = false;
EXPLAIN (COSTS OFF) EXPLAIN (COSTS OFF)