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IS JSON predicate

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This patch intrdocuces the SQL standard IS JSON predicate. It operates
on text and bytea values representing JSON as well as on the json and
jsonb types. Each test has an IS and IS NOT variant. The tests are:

IS JSON [VALUE]
IS JSON ARRAY
IS JSON OBJECT
IS JSON SCALAR
IS JSON  WITH | WITHOUT UNIQUE KEYS

These are mostly self-explanatory, but note that IS JSON WITHOUT UNIQUE
KEYS is true whenever IS JSON is true, and IS JSON WITH UNIQUE KEYS is
true whenever IS JSON is true except it IS JSON OBJECT is true and there
are duplicate keys (which is never the case when applied to jsonb values).

Nikita Glukhov

Reviewers have included (in no particular order) Andres Freund, Alexander
Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zihong Yu,
Himanshu Upadhyaya, Daniel Gustafsson, Justin Pryzby.

Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru
This commit is contained in:
Andrew Dunstan
2022-03-03 13:02:53 -05:00
parent 6198420ad8
commit 33a377608f
25 changed files with 856 additions and 17 deletions
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96
src/test/regress/sql/sqljson.sql
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@ -280,3 +280,99 @@ SELECT JSON_ARRAY(SELECT i FROM (VALUES (1), (2), (NULL), (4)) foo(i) RETURNING
\sv json_array_subquery_view
DROP VIEW json_array_subquery_view;
-- IS JSON predicate
SELECT NULL IS JSON;
SELECT NULL IS NOT JSON;
SELECT NULL::json IS JSON;
SELECT NULL::jsonb IS JSON;
SELECT NULL::text IS JSON;
SELECT NULL::bytea IS JSON;
SELECT NULL::int IS JSON;
SELECT '' IS JSON;
SELECT bytea '\x00' IS JSON;
CREATE TABLE test_is_json (js text);
INSERT INTO test_is_json VALUES
(NULL),
(''),
('123'),
('"aaa "'),
('true'),
('null'),
('[]'),
('[1, "2", {}]'),
('{}'),
('{ "a": 1, "b": null }'),
('{ "a": 1, "a": null }'),
('{ "a": 1, "b": [{ "a": 1 }, { "a": 2 }] }'),
('{ "a": 1, "b": [{ "a": 1, "b": 0, "a": 2 }] }'),
('aaa'),
('{a:1}'),
('["a",]');
SELECT
js,
js IS JSON "IS JSON",
js IS NOT JSON "IS NOT JSON",
js IS JSON VALUE "IS VALUE",
js IS JSON OBJECT "IS OBJECT",
js IS JSON ARRAY "IS ARRAY",
js IS JSON SCALAR "IS SCALAR",
js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE",
js IS JSON WITH UNIQUE KEYS "WITH UNIQUE"
FROM
test_is_json;
SELECT
js,
js IS JSON "IS JSON",
js IS NOT JSON "IS NOT JSON",
js IS JSON VALUE "IS VALUE",
js IS JSON OBJECT "IS OBJECT",
js IS JSON ARRAY "IS ARRAY",
js IS JSON SCALAR "IS SCALAR",
js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE",
js IS JSON WITH UNIQUE KEYS "WITH UNIQUE"
FROM
(SELECT js::json FROM test_is_json WHERE js IS JSON) foo(js);
SELECT
js0,
js IS JSON "IS JSON",
js IS NOT JSON "IS NOT JSON",
js IS JSON VALUE "IS VALUE",
js IS JSON OBJECT "IS OBJECT",
js IS JSON ARRAY "IS ARRAY",
js IS JSON SCALAR "IS SCALAR",
js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE",
js IS JSON WITH UNIQUE KEYS "WITH UNIQUE"
FROM
(SELECT js, js::bytea FROM test_is_json WHERE js IS JSON) foo(js0, js);
SELECT
js,
js IS JSON "IS JSON",
js IS NOT JSON "IS NOT JSON",
js IS JSON VALUE "IS VALUE",
js IS JSON OBJECT "IS OBJECT",
js IS JSON ARRAY "IS ARRAY",
js IS JSON SCALAR "IS SCALAR",
js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE",
js IS JSON WITH UNIQUE KEYS "WITH UNIQUE"
FROM
(SELECT js::jsonb FROM test_is_json WHERE js IS JSON) foo(js);
-- Test IS JSON deparsing
EXPLAIN (VERBOSE, COSTS OFF)
SELECT '1' IS JSON AS "any", ('1' || i) IS JSON SCALAR AS "scalar", '[]' IS NOT JSON ARRAY AS "array", '{}' IS JSON OBJECT WITH UNIQUE AS "object" FROM generate_series(1, 3) i;
CREATE VIEW is_json_view AS
SELECT '1' IS JSON AS "any", ('1' || i) IS JSON SCALAR AS "scalar", '[]' IS NOT JSON ARRAY AS "array", '{}' IS JSON OBJECT WITH UNIQUE AS "object" FROM generate_series(1, 3) i;
\sv is_json_view
DROP VIEW is_json_view;