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Provide stable test for NULL-values in KNN SP-GiST

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f5f084fc3e has removed test because of its instability.  This commit provides
alternative test with determined ordering using extra ORDER BY expression.

Backpatch-through: 12
This commit is contained in:
Alexander Korotkov 2019-09-20 15:31:12 +03:00
parent c53e40a132
commit 5033e95808
2 changed files with 14 additions and 0 deletions
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10
src/test/regress/expected/create_index_spgist.out
View File

@ -555,6 +555,16 @@ WHERE seq.dist IS DISTINCT FROM idx.dist;
---+------+---+---+------+---
(0 rows)
-- check ORDER BY distance to NULL
SELECT (SELECT p FROM kd_point_tbl ORDER BY p <-> pt, p <-> '0,0' LIMIT 1)
FROM (VALUES (point '1,2'), (NULL), ('1234,5678')) pts(pt);
p
-------------
(59,21)
(59,21)
(1239,5647)
(3 rows)
EXPLAIN (COSTS OFF)
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';
QUERY PLAN

4
src/test/regress/sql/create_index_spgist.sql
View File

@ -225,6 +225,10 @@ SELECT * FROM quad_point_tbl_ord_seq3 seq FULL JOIN kd_point_tbl_ord_idx3 idx
ON seq.n = idx.n
WHERE seq.dist IS DISTINCT FROM idx.dist;
-- check ORDER BY distance to NULL
SELECT (SELECT p FROM kd_point_tbl ORDER BY p <-> pt, p <-> '0,0' LIMIT 1)
FROM (VALUES (point '1,2'), (NULL), ('1234,5678')) pts(pt);
EXPLAIN (COSTS OFF)
SELECT count(*) FROM radix_text_tbl WHERE t = 'P0123456789abcdef';