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Allow to omit boundaries in array subscript

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Allow to omiy lower or upper or both boundaries in array subscript
for selecting slice of array.

Author: YUriy Zhuravlev
This commit is contained in:
Teodor Sigaev
2015-12-18 15:18:58 +03:00
parent 33bd250f6c
commit 9246af6799
12 changed files with 184 additions and 28 deletions
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15
src/test/regress/sql/arrays.sql
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@@ -609,3 +609,18 @@ SELECT width_bucket(5, '{}');
SELECT width_bucket('5'::text, ARRAY[3, 4]::integer[]);
SELECT width_bucket(5, ARRAY[3, 4, NULL]);
SELECT width_bucket(5, ARRAY[ARRAY[1, 2], ARRAY[3, 4]]);
-- slices with empty lower and/or upper index
CREATE TABLE arrtest_s (
a int2[],
b int2[][]
);
INSERT INTO arrtest_s VALUES ('{1,2,3,4,5}', '{{1,2,3}, {4,5,6}, {7,8,9}}');
SELECT a[:3], b[:2][:2] FROM arrtest_s;
SELECT a[2:], b[2:][2:] FROM arrtest_s;
SELECT a[:], b[:] FROM arrtest_s;
-- errors
UPDATE arrtest_s SET a[:3] = '{11, 12, 13}', b[:2][:2] = '{{11,12}, {14, 15}}';
UPDATE arrtest_s SET a[3:] = '{23, 24, 25}', b[2:][2:] = '{{25,26}, {28, 29}}';
UPDATE arrtest_s SET a[:] = '{23, 24, 25}';