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Add support for <-> (box, point) operator to GiST box_ops

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Index-based calculation of this operator is exact.  So, signature of
gist_bbox_distance() function is changes so that caller is responsible for
setting *recheck flag.

Discussion: https://postgr.es/m/f71ba19d-d989-63b6-f04a-abf02ad9345d%40postgrespro.ru
Author: Nikita Glukhov
Reviewed-by: Tom Lane, Alexander Korotkov
This commit is contained in:
Alexander Korotkov
2019-07-14 14:56:18 +03:00
parent 6254c55f81
commit c085e1c1cb
7 changed files with 133 additions and 17 deletions
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16
src/test/regress/sql/gist.sql
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@@ -109,6 +109,22 @@ select b from gist_tbl where b <@ box(point(5,5), point(6,6));
-- execute the same
select b from gist_tbl where b <@ box(point(5,5), point(6,6));
-- Also test an index-only knn-search
explain (costs off)
select b from gist_tbl where b <@ box(point(5,5), point(6,6))
order by b <-> point(5.2, 5.91);
select b from gist_tbl where b <@ box(point(5,5), point(6,6))
order by b <-> point(5.2, 5.91);
-- Check commuted case as well
explain (costs off)
select b from gist_tbl where b <@ box(point(5,5), point(6,6))
order by point(5.2, 5.91) <-> b;
select b from gist_tbl where b <@ box(point(5,5), point(6,6))
order by point(5.2, 5.91) <-> b;
drop index gist_tbl_box_index;
-- Test that an index-only scan is not chosen, when the query involves the