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array_offset() and array_offsets()

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These functions return the offset position or positions of a value in an
array.

Author: Pavel Stěhule
Reviewed by: Jim Nasby
This commit is contained in:
Alvaro Herrera
2015-03-18 16:01:34 -03:00
parent f9dead5624
commit 13dbc7a824
10 changed files with 525 additions and 8 deletions
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100
src/test/regress/expected/arrays.out
View File

@ -366,6 +366,106 @@ SELECT array_cat(ARRAY[[3,4],[5,6]], ARRAY[1,2]) AS "{{3,4},{5,6},{1,2}}";
{{3,4},{5,6},{1,2}}
(1 row)
SELECT array_offset(ARRAY[1,2,3,4,5], 4);
array_offset
--------------
4
(1 row)
SELECT array_offset(ARRAY[5,3,4,2,1], 4);
array_offset
--------------
3
(1 row)
SELECT array_offset(ARRAY[[1,2],[3,4]], 3);
ERROR: searching for elements in multidimensional arrays is not supported
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu','fri','sat'], 'mon');
array_offset
--------------
2
(1 row)
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu','fri','sat'], 'sat');
array_offset
--------------
7
(1 row)
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu','fri','sat'], NULL);
array_offset
--------------
(1 row)
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu',NULL,'fri','sat'], NULL);
array_offset
--------------
6
(1 row)
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu',NULL,'fri','sat'], 'sat');
array_offset
--------------
8
(1 row)
SELECT array_offsets(NULL, 10);
array_offsets
---------------
(1 row)
SELECT array_offsets(NULL, NULL::int);
array_offsets
---------------
(1 row)
SELECT array_offsets(ARRAY[1,2,3,4,5,6,1,2,3,4,5,6], 4);
array_offsets
---------------
{4,10}
(1 row)
SELECT array_offsets(ARRAY[[1,2],[3,4]], 4);
ERROR: searching for elements in multidimensional arrays is not supported
SELECT array_offsets(ARRAY[1,2,3,4,5,6,1,2,3,4,5,6], NULL);
array_offsets
---------------
{}
(1 row)
SELECT array_offsets(ARRAY[1,2,3,NULL,5,6,1,2,3,NULL,5,6], NULL);
array_offsets
---------------
{4,10}
(1 row)
SELECT array_length(array_offsets(ARRAY(SELECT 'AAAAAAAAAAAAAAAAAAAAAAAAA'::text || i % 10
FROM generate_series(1,100) g(i)),
'AAAAAAAAAAAAAAAAAAAAAAAAA5'), 1);
array_length
--------------
10
(1 row)
DO $$
DECLARE
o int;
a int[] := ARRAY[1,2,3,2,3,1,2];
BEGIN
o := array_offset(a, 2);
WHILE o IS NOT NULL
LOOP
RAISE NOTICE '%', o;
o := array_offset(a, 2, o + 1);
END LOOP;
END
$$ LANGUAGE plpgsql;
NOTICE: 2
NOTICE: 4
NOTICE: 7
-- operators
SELECT a FROM arrtest WHERE b = ARRAY[[[113,142],[1,147]]];
a

33
src/test/regress/sql/arrays.sql
View File

@ -185,6 +185,39 @@ SELECT array_cat(ARRAY[1,2], ARRAY[3,4]) AS "{1,2,3,4}";
SELECT array_cat(ARRAY[1,2], ARRAY[[3,4],[5,6]]) AS "{{1,2},{3,4},{5,6}}";
SELECT array_cat(ARRAY[[3,4],[5,6]], ARRAY[1,2]) AS "{{3,4},{5,6},{1,2}}";
SELECT array_offset(ARRAY[1,2,3,4,5], 4);
SELECT array_offset(ARRAY[5,3,4,2,1], 4);
SELECT array_offset(ARRAY[[1,2],[3,4]], 3);
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu','fri','sat'], 'mon');
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu','fri','sat'], 'sat');
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu','fri','sat'], NULL);
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu',NULL,'fri','sat'], NULL);
SELECT array_offset(ARRAY['sun','mon','tue','wed','thu',NULL,'fri','sat'], 'sat');
SELECT array_offsets(NULL, 10);
SELECT array_offsets(NULL, NULL::int);
SELECT array_offsets(ARRAY[1,2,3,4,5,6,1,2,3,4,5,6], 4);
SELECT array_offsets(ARRAY[[1,2],[3,4]], 4);
SELECT array_offsets(ARRAY[1,2,3,4,5,6,1,2,3,4,5,6], NULL);
SELECT array_offsets(ARRAY[1,2,3,NULL,5,6,1,2,3,NULL,5,6], NULL);
SELECT array_length(array_offsets(ARRAY(SELECT 'AAAAAAAAAAAAAAAAAAAAAAAAA'::text || i % 10
FROM generate_series(1,100) g(i)),
'AAAAAAAAAAAAAAAAAAAAAAAAA5'), 1);
DO $$
DECLARE
o int;
a int[] := ARRAY[1,2,3,2,3,1,2];
BEGIN
o := array_offset(a, 2);
WHILE o IS NOT NULL
LOOP
RAISE NOTICE '%', o;
o := array_offset(a, 2, o + 1);
END LOOP;
END
$$ LANGUAGE plpgsql;
-- operators
SELECT a FROM arrtest WHERE b = ARRAY[[[113,142],[1,147]]];
SELECT NOT ARRAY[1.1,1.2,1.3] = ARRAY[1.1,1.2,1.3] AS "FALSE";