path: root/src/test/regress/expected/json.out

-- Strings.
SELECT '""'::json;				-- OK.
 json 
------
 ""
(1 row)

SELECT $$''$$::json;			-- ERROR, single quotes are not allowed
ERROR:  invalid input syntax for type json
LINE 1: SELECT $$''$$::json;
               ^
DETAIL:  Token "'" is invalid.
CONTEXT:  JSON data, line 1: '...
SELECT '"abc"'::json;			-- OK
 json  
-------
 "abc"
(1 row)

SELECT '"abc'::json;			-- ERROR, quotes not closed
ERROR:  invalid input syntax for type json
LINE 1: SELECT '"abc'::json;
               ^
DETAIL:  Token ""abc" is invalid.
CONTEXT:  JSON data, line 1: "abc
SELECT '"abc
def"'::json;					-- ERROR, unescaped newline in string constant
ERROR:  invalid input syntax for type json
LINE 1: SELECT '"abc
               ^
DETAIL:  Character with value 0x0a must be escaped.
CONTEXT:  JSON data, line 1: "abc
SELECT '"\n\"\\"'::json;		-- OK, legal escapes
   json   
----------
 "\n\"\\"
(1 row)

SELECT '"\v"'::json;			-- ERROR, not a valid JSON escape
ERROR:  invalid input syntax for type json
LINE 1: SELECT '"\v"'::json;
               ^
DETAIL:  Escape sequence "\v" is invalid.
CONTEXT:  JSON data, line 1: "\v...
SELECT '"\u"'::json;			-- ERROR, incomplete escape
ERROR:  invalid input syntax for type json
LINE 1: SELECT '"\u"'::json;
               ^
DETAIL:  "\u" must be followed by four hexadecimal digits.
CONTEXT:  JSON data, line 1: "\u"
SELECT '"\u00"'::json;			-- ERROR, incomplete escape
ERROR:  invalid input syntax for type json
LINE 1: SELECT '"\u00"'::json;
               ^
DETAIL:  "\u" must be followed by four hexadecimal digits.
CONTEXT:  JSON data, line 1: "\u00"
SELECT '"\u000g"'::json;		-- ERROR, g is not a hex digit
ERROR:  invalid input syntax for type json
LINE 1: SELECT '"\u000g"'::json;
               ^
DETAIL:  "\u" must be followed by four hexadecimal digits.
CONTEXT:  JSON data, line 1: "\u000g...
SELECT '"\u0000"'::json;		-- OK, legal escape
   json   
----------
 "\u0000"
(1 row)

SELECT '"\uaBcD"'::json;		-- OK, uppercase and lower case both OK
   json   
----------
 "\uaBcD"
(1 row)

-- Numbers.
SELECT '1'::json;				-- OK
 json 
------
 1
(1 row)

SELECT '0'::json;				-- OK
 json 
------
 0
(1 row)

SELECT '01'::json;				-- ERROR, not valid according to JSON spec
ERROR:  invalid input syntax for type json
LINE 1: SELECT '01'::json;
               ^
DETAIL:  Token "01" is invalid.
CONTEXT:  JSON data, line 1: 01
SELECT '0.1'::json;				-- OK
 json 
------
 0.1
(1 row)

SELECT '9223372036854775808'::json;	-- OK, even though it's too large for int8
        json         
---------------------
 9223372036854775808
(1 row)

SELECT '1e100'::json;			-- OK
 json  
-------
 1e100
(1 row)

SELECT '1.3e100'::json;			-- OK
  json   
---------
 1.3e100
(1 row)

SELECT '1f2'::json;				-- ERROR
ERROR:  invalid input syntax for type json
LINE 1: SELECT '1f2'::json;
               ^
DETAIL:  Token "1f2" is invalid.
CONTEXT:  JSON data, line 1: 1f2
SELECT '0.x1'::json;			-- ERROR
ERROR:  invalid input syntax for type json
LINE 1: SELECT '0.x1'::json;
               ^
DETAIL:  Token "0.x1" is invalid.
CONTEXT:  JSON data, line 1: 0.x1
SELECT '1.3ex100'::json;		-- ERROR
ERROR:  invalid input syntax for type json
LINE 1: SELECT '1.3ex100'::json;
               ^
DETAIL:  Token "1.3ex100" is invalid.
CONTEXT:  JSON data, line 1: 1.3ex100
-- Arrays.
SELECT '[]'::json;				-- OK
 json 
------
 []
(1 row)

SELECT '[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]'::json;  -- OK
                                                                                                   json                                                                                                   
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
(1 row)

SELECT '[1,2]'::json;			-- OK
 json  
-------
 [1,2]
(1 row)

SELECT '[1,2,]'::json;			-- ERROR, trailing comma
ERROR:  invalid input syntax for type json
LINE 1: SELECT '[1,2,]'::json;
               ^
DETAIL:  Expected JSON value, but found "]".
CONTEXT:  JSON data, line 1: [1,2,]
SELECT '[1,2'::json;			-- ERROR, no closing bracket
ERROR:  invalid input syntax for type json
LINE 1: SELECT '[1,2'::json;
               ^
DETAIL:  The input string ended unexpectedly.
CONTEXT:  JSON data, line 1: [1,2
SELECT '[1,[2]'::json;			-- ERROR, no closing bracket
ERROR:  invalid input syntax for type json
LINE 1: SELECT '[1,[2]'::json;
               ^
DETAIL:  The input string ended unexpectedly.
CONTEXT:  JSON data, line 1: [1,[2]
-- Objects.
SELECT '{}'::json;				-- OK
 json 
------
 {}
(1 row)

SELECT '{"abc"}'::json;			-- ERROR, no value
ERROR:  invalid input syntax for type json
LINE 1: SELECT '{"abc"}'::json;
               ^
DETAIL:  Expected ":", but found "}".
CONTEXT:  JSON data, line 1: {"abc"}
SELECT '{"abc":1}'::json;		-- OK
   json    
-----------
 {"abc":1}
(1 row)

SELECT '{1:"abc"}'::json;		-- ERROR, keys must be strings
ERROR:  invalid input syntax for type json
LINE 1: SELECT '{1:"abc"}'::json;
               ^
DETAIL:  Expected string or "}", but found "1".
CONTEXT:  JSON data, line 1: {1...
SELECT '{"abc",1}'::json;		-- ERROR, wrong separator
ERROR:  invalid input syntax for type json
LINE 1: SELECT '{"abc",1}'::json;
               ^
DETAIL:  Expected ":", but found ",".
CONTEXT:  JSON data, line 1: {"abc",...
SELECT '{"abc"=1}'::json;		-- ERROR, totally wrong separator
ERROR:  invalid input syntax for type json
LINE 1: SELECT '{"abc"=1}'::json;
               ^
DETAIL:  Token "=" is invalid.
CONTEXT:  JSON data, line 1: {"abc"=...
SELECT '{"abc"::1}'::json;		-- ERROR, another wrong separator
ERROR:  invalid input syntax for type json
LINE 1: SELECT '{"abc"::1}'::json;
               ^
DETAIL:  Expected JSON value, but found ":".
CONTEXT:  JSON data, line 1: {"abc"::...
SELECT '{"abc":1,"def":2,"ghi":[3,4],"hij":{"klm":5,"nop":[6]}}'::json; -- OK
                          json                           
---------------------------------------------------------
 {"abc":1,"def":2,"ghi":[3,4],"hij":{"klm":5,"nop":[6]}}
(1 row)

SELECT '{"abc":1:2}'::json;		-- ERROR, colon in wrong spot
ERROR:  invalid input syntax for type json
LINE 1: SELECT '{"abc":1:2}'::json;
               ^
DETAIL:  Expected "," or "}", but found ":".
CONTEXT:  JSON data, line 1: {"abc":1:...
SELECT '{"abc":1,3}'::json;		-- ERROR, no value
ERROR:  invalid input syntax for type json
LINE 1: SELECT '{"abc":1,3}'::json;
               ^
DETAIL:  Expected string, but found "3".
CONTEXT:  JSON data, line 1: {"abc":1,3...
-- Miscellaneous stuff.
SELECT 'true'::json;			-- OK
 json 
------
 true
(1 row)

SELECT 'false'::json;			-- OK
 json  
-------
 false
(1 row)

SELECT 'null'::json;			-- OK
 json 
------
 null
(1 row)

SELECT ' true '::json;			-- OK, even with extra whitespace
  json  
--------
  true 
(1 row)

SELECT 'true false'::json;		-- ERROR, too many values
ERROR:  invalid input syntax for type json
LINE 1: SELECT 'true false'::json;
               ^
DETAIL:  Expected end of input, but found "false".
CONTEXT:  JSON data, line 1: true false
SELECT 'true, false'::json;		-- ERROR, too many values
ERROR:  invalid input syntax for type json
LINE 1: SELECT 'true, false'::json;
               ^
DETAIL:  Expected end of input, but found ",".
CONTEXT:  JSON data, line 1: true,...
SELECT 'truf'::json;			-- ERROR, not a keyword
ERROR:  invalid input syntax for type json
LINE 1: SELECT 'truf'::json;
               ^
DETAIL:  Token "truf" is invalid.
CONTEXT:  JSON data, line 1: truf
SELECT 'trues'::json;			-- ERROR, not a keyword
ERROR:  invalid input syntax for type json
LINE 1: SELECT 'trues'::json;
               ^
DETAIL:  Token "trues" is invalid.
CONTEXT:  JSON data, line 1: trues
SELECT ''::json;				-- ERROR, no value
ERROR:  invalid input syntax for type json
LINE 1: SELECT ''::json;
               ^
DETAIL:  The input string ended unexpectedly.
CONTEXT:  JSON data, line 1: 
SELECT '    '::json;			-- ERROR, no value
ERROR:  invalid input syntax for type json
LINE 1: SELECT '    '::json;
               ^
DETAIL:  The input string ended unexpectedly.
CONTEXT:  JSON data, line 1:     
--constructors
-- array_to_json
SELECT array_to_json(array(select 1 as a));
 array_to_json 
---------------
 [1]
(1 row)

SELECT array_to_json(array_agg(q),false) from (select x as b, x * 2 as c from generate_series(1,3) x) q;
                array_to_json                
---------------------------------------------
 [{"b":1,"c":2},{"b":2,"c":4},{"b":3,"c":6}]
(1 row)

SELECT array_to_json(array_agg(q),true) from (select x as b, x * 2 as c from generate_series(1,3) x) q;
  array_to_json  
-----------------
 [{"b":1,"c":2},+
  {"b":2,"c":4},+
  {"b":3,"c":6}]
(1 row)

SELECT array_to_json(array_agg(q),false)
  FROM ( SELECT $$a$$ || x AS b, y AS c,
               ARRAY[ROW(x.*,ARRAY[1,2,3]),
               ROW(y.*,ARRAY[4,5,6])] AS z
         FROM generate_series(1,2) x,
              generate_series(4,5) y) q;
                                                                                                                                 array_to_json                                                                                                                                 
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 [{"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},{"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]},{"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},{"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}]
(1 row)

SELECT array_to_json(array_agg(x),false) from generate_series(5,10) x;
 array_to_json  
----------------
 [5,6,7,8,9,10]
(1 row)

SELECT array_to_json('{{1,5},{99,100}}'::int[]);
  array_to_json   
------------------
 [[1,5],[99,100]]
(1 row)

-- row_to_json
SELECT row_to_json(row(1,'foo'));
     row_to_json     
---------------------
 {"f1":1,"f2":"foo"}
(1 row)

SELECT row_to_json(q)
FROM (SELECT $$a$$ || x AS b,
         y AS c,
         ARRAY[ROW(x.*,ARRAY[1,2,3]),
               ROW(y.*,ARRAY[4,5,6])] AS z
      FROM generate_series(1,2) x,
           generate_series(4,5) y) q;
                            row_to_json                             
--------------------------------------------------------------------
 {"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
 {"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
 {"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
 {"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
(4 rows)

SELECT row_to_json(q,true)
FROM (SELECT $$a$$ || x AS b,
         y AS c,
         ARRAY[ROW(x.*,ARRAY[1,2,3]),
               ROW(y.*,ARRAY[4,5,6])] AS z
      FROM generate_series(1,2) x,
           generate_series(4,5) y) q;
                     row_to_json                     
-----------------------------------------------------
 {"b":"a1",                                         +
  "c":4,                                            +
  "z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
 {"b":"a1",                                         +
  "c":5,                                            +
  "z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
 {"b":"a2",                                         +
  "c":4,                                            +
  "z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
 {"b":"a2",                                         +
  "c":5,                                            +
  "z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
(4 rows)

CREATE TEMP TABLE rows AS
SELECT x, 'txt' || x as y
FROM generate_series(1,3) AS x;
SELECT row_to_json(q,true)
FROM rows q;
 row_to_json  
--------------
 {"x":1,     +
  "y":"txt1"}
 {"x":2,     +
  "y":"txt2"}
 {"x":3,     +
  "y":"txt3"}
(3 rows)

SELECT row_to_json(row((select array_agg(x) as d from generate_series(5,10) x)),false);
      row_to_json      
-----------------------
 {"f1":[5,6,7,8,9,10]}
(1 row)

-- to_json, timestamps
select to_json(timestamp '2014-05-28 12:22:35.614298');
           to_json            
------------------------------
 "2014-05-28T12:22:35.614298"
(1 row)

BEGIN;
SET LOCAL TIME ZONE 10.5;
select to_json(timestamptz '2014-05-28 12:22:35.614298-04');
              to_json               
------------------------------------
 "2014-05-29T02:52:35.614298+10:30"
(1 row)

SET LOCAL TIME ZONE -8;
select to_json(timestamptz '2014-05-28 12:22:35.614298-04');
              to_json               
------------------------------------
 "2014-05-28T08:22:35.614298-08:00"
(1 row)

COMMIT;
select to_json(date '2014-05-28');
   to_json    
--------------
 "2014-05-28"
(1 row)

select to_json(date 'Infinity');
  to_json   
------------
 "infinity"
(1 row)

select to_json(timestamp 'Infinity');
  to_json   
------------
 "infinity"
(1 row)

select to_json(timestamptz 'Infinity');
  to_json   
------------
 "infinity"
(1 row)

--json_agg
SELECT json_agg(q)
  FROM ( SELECT $$a$$ || x AS b, y AS c,
               ARRAY[ROW(x.*,ARRAY[1,2,3]),
               ROW(y.*,ARRAY[4,5,6])] AS z
         FROM generate_series(1,2) x,
              generate_series(4,5) y) q;
                               json_agg                                
-----------------------------------------------------------------------
 [{"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}, +
  {"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}, +
  {"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}, +
  {"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}]
(1 row)

SELECT json_agg(q)
  FROM rows q;
       json_agg        
-----------------------
 [{"x":1,"y":"txt1"}, +
  {"x":2,"y":"txt2"}, +
  {"x":3,"y":"txt3"}]
(1 row)

-- non-numeric output
SELECT row_to_json(q)
FROM (SELECT 'NaN'::float8 AS "float8field") q;
      row_to_json      
-----------------------
 {"float8field":"NaN"}
(1 row)

SELECT row_to_json(q)
FROM (SELECT 'Infinity'::float8 AS "float8field") q;
        row_to_json         
----------------------------
 {"float8field":"Infinity"}
(1 row)

SELECT row_to_json(q)
FROM (SELECT '-Infinity'::float8 AS "float8field") q;
         row_to_json         
-----------------------------
 {"float8field":"-Infinity"}
(1 row)

-- json input
SELECT row_to_json(q)
FROM (SELECT '{"a":1,"b": [2,3,4,"d","e","f"],"c":{"p":1,"q":2}}'::json AS "jsonfield") q;
                           row_to_json                            
------------------------------------------------------------------
 {"jsonfield":{"a":1,"b": [2,3,4,"d","e","f"],"c":{"p":1,"q":2}}}
(1 row)

-- json extraction functions
CREATE TEMP TABLE test_json (
       json_type text,
       test_json json
);
INSERT INTO test_json VALUES
('scalar','"a scalar"'),
('array','["zero", "one","two",null,"four","five", [1,2,3],{"f1":9}]'),
('object','{"field1":"val1","field2":"val2","field3":null, "field4": 4, "field5": [1,2,3], "field6": {"f1":9}}');
SELECT test_json -> 'x'
FROM test_json
WHERE json_type = 'scalar';
 ?column? 
----------
 
(1 row)

SELECT test_json -> 'x'
FROM test_json
WHERE json_type = 'array';
 ?column? 
----------
 
(1 row)

SELECT test_json -> 'x'
FROM test_json
WHERE json_type = 'object';
 ?column? 
----------
 
(1 row)

SELECT test_json->'field2'
FROM test_json
WHERE json_type = 'object';
 ?column? 
----------
 "val2"
(1 row)

SELECT test_json->>'field2'
FROM test_json
WHERE json_type = 'object';
 ?column? 
----------
 val2
(1 row)

SELECT test_json -> 2
FROM test_json
WHERE json_type = 'scalar';
 ?column? 
----------
 
(1 row)

SELECT test_json -> 2
FROM test_json
WHERE json_type = 'array';
 ?column? 
----------
 "two"
(1 row)

SELECT test_json -> 2
FROM test_json
WHERE json_type = 'object';
 ?column? 
----------
 
(1 row)

SELECT test_json->>2
FROM test_json
WHERE json_type = 'array';
 ?column? 
----------
 two
(1 row)

SELECT test_json ->> 6 FROM test_json WHERE json_type = 'array';
 ?column? 
----------
 [1,2,3]
(1 row)

SELECT test_json ->> 7 FROM test_json WHERE json_type = 'array';
 ?column? 
----------
 {"f1":9}
(1 row)

SELECT test_json ->> 'field4' FROM test_json WHERE json_type = 'object';
 ?column? 
----------
 4
(1 row)

SELECT test_json ->> 'field5' FROM test_json WHERE json_type = 'object';
 ?column? 
----------
 [1,2,3]
(1 row)

SELECT test_json ->> 'field6' FROM test_json WHERE json_type = 'object';
 ?column? 
----------
 {"f1":9}
(1 row)

SELECT json_object_keys(test_json)
FROM test_json
WHERE json_type = 'scalar';
ERROR:  cannot call json_object_keys on a scalar
SELECT json_object_keys(test_json)
FROM test_json
WHERE json_type = 'array';
ERROR:  cannot call json_object_keys on an array
SELECT json_object_keys(test_json)
FROM test_json
WHERE json_type = 'object';
 json_object_keys 
------------------
 field1
 field2
 field3
 field4
 field5
 field6
(6 rows)

-- test extending object_keys resultset - initial resultset size is 256
select count(*) from
    (select json_object_keys(json_object(array_agg(g)))
     from (select unnest(array['f'||n,n::text])as g
           from generate_series(1,300) as n) x ) y;
 count 
-------
   300
(1 row)

-- nulls
select (test_json->'field3') is null as expect_false
from test_json
where json_type = 'object';
 expect_false 
--------------
 f
(1 row)

select (test_json->>'field3') is null as expect_true
from test_json
where json_type = 'object';
 expect_true 
-------------
 t
(1 row)

select (test_json->3) is null as expect_false
from test_json
where json_type = 'array';
 expect_false 
--------------
 f
(1 row)

select (test_json->>3) is null as expect_true
from test_json
where json_type = 'array';
 expect_true 
-------------
 t
(1 row)

-- corner cases
select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> null::text;
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> null::int;
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> 1;
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> 'z';
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> '';
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json -> 1;
  ?column?   
-------------
 {"b": "cc"}
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json -> 3;
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json -> 'z';
 ?column? 
----------
 
(1 row)

select '{"a": "c", "b": null}'::json -> 'b';
 ?column? 
----------
 null
(1 row)

select '"foo"'::json -> 1;
 ?column? 
----------
 
(1 row)

select '"foo"'::json -> 'z';
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> null::text;
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> null::int;
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> 1;
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> 'z';
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> '';
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json ->> 1;
  ?column?   
-------------
 {"b": "cc"}
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json ->> 3;
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json ->> 'z';
 ?column? 
----------
 
(1 row)

select '{"a": "c", "b": null}'::json ->> 'b';
 ?column? 
----------
 
(1 row)

select '"foo"'::json ->> 1;
 ?column? 
----------
 
(1 row)

select '"foo"'::json ->> 'z';
 ?column? 
----------
 
(1 row)

-- array length
SELECT json_array_length('[1,2,3,{"f1":1,"f2":[5,6]},4]');
 json_array_length 
-------------------
                 5
(1 row)

SELECT json_array_length('[]');
 json_array_length 
-------------------
                 0
(1 row)

SELECT json_array_length('{"f1":1,"f2":[5,6]}');
ERROR:  cannot get array length of a non-array
SELECT json_array_length('4');
ERROR:  cannot get array length of a scalar
-- each
select json_each('{"f1":[1,2,3],"f2":{"f3":1},"f4":null}');
     json_each     
-------------------
 (f1,"[1,2,3]")
 (f2,"{""f3"":1}")
 (f4,null)
(3 rows)

select * from json_each('{"f1":[1,2,3],"f2":{"f3":1},"f4":null,"f5":99,"f6":"stringy"}') q;
 key |   value   
-----+-----------
 f1  | [1,2,3]
 f2  | {"f3":1}
 f4  | null
 f5  | 99
 f6  | "stringy"
(5 rows)

select json_each_text('{"f1":[1,2,3],"f2":{"f3":1},"f4":null,"f5":"null"}');
  json_each_text   
-------------------
 (f1,"[1,2,3]")
 (f2,"{""f3"":1}")
 (f4,)
 (f5,null)
(4 rows)

select * from json_each_text('{"f1":[1,2,3],"f2":{"f3":1},"f4":null,"f5":99,"f6":"stringy"}') q;
 key |  value   
-----+----------
 f1  | [1,2,3]
 f2  | {"f3":1}
 f4  | 
 f5  | 99
 f6  | stringy
(5 rows)

-- extract_path, extract_path_as_text
select json_extract_path('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f4','f6');
 json_extract_path 
-------------------
 "stringy"
(1 row)

select json_extract_path('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f2');
 json_extract_path 
-------------------
 {"f3":1}
(1 row)

select json_extract_path('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',0::text);
 json_extract_path 
-------------------
 "f3"
(1 row)

select json_extract_path('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',1::text);
 json_extract_path 
-------------------
 1
(1 row)

select json_extract_path_text('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f4','f6');
 json_extract_path_text 
------------------------
 stringy
(1 row)

select json_extract_path_text('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f2');
 json_extract_path_text 
------------------------
 {"f3":1}
(1 row)

select json_extract_path_text('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',0::text);
 json_extract_path_text 
------------------------
 f3
(1 row)

select json_extract_path_text('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',1::text);
 json_extract_path_text 
------------------------
 1
(1 row)

-- extract_path nulls
select json_extract_path('{"f2":{"f3":1},"f4":{"f5":null,"f6":"stringy"}}','f4','f5') is null as expect_false;
 expect_false 
--------------
 f
(1 row)

select json_extract_path_text('{"f2":{"f3":1},"f4":{"f5":null,"f6":"stringy"}}','f4','f5') is null as expect_true;
 expect_true 
-------------
 t
(1 row)

select json_extract_path('{"f2":{"f3":1},"f4":[0,1,2,null]}','f4','3') is null as expect_false;
 expect_false 
--------------
 f
(1 row)

select json_extract_path_text('{"f2":{"f3":1},"f4":[0,1,2,null]}','f4','3') is null as expect_true;
 expect_true 
-------------
 t
(1 row)

-- extract_path operators
select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f4','f6'];
 ?column?  
-----------
 "stringy"
(1 row)

select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f2'];
 ?column? 
----------
 {"f3":1}
(1 row)

select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f2','0'];
 ?column? 
----------
 "f3"
(1 row)

select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f2','1'];
 ?column? 
----------
 1
(1 row)

select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f4','f6'];
 ?column? 
----------
 stringy
(1 row)

select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f2'];
 ?column? 
----------
 {"f3":1}
(1 row)

select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f2','0'];
 ?column? 
----------
 f3
(1 row)

select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f2','1'];
 ?column? 
----------
 1
(1 row)

-- corner cases for same
select '{"a": {"b":{"c": "foo"}}}'::json #> '{}';
         ?column?          
---------------------------
 {"a": {"b":{"c": "foo"}}}
(1 row)

select '[1,2,3]'::json #> '{}';
 ?column? 
----------
 [1,2,3]
(1 row)

select '"foo"'::json #> '{}';
 ?column? 
----------
 "foo"
(1 row)

select '42'::json #> '{}';
 ?column? 
----------
 42
(1 row)

select 'null'::json #> '{}';
 ?column? 
----------
 null
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #> array['a'];
      ?column?      
--------------------
 {"b":{"c": "foo"}}
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #> array['a', null];
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #> array['a', ''];
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','b'];
   ?column?   
--------------
 {"c": "foo"}
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','b','c'];
 ?column? 
----------
 "foo"
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','b','c','d'];
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','z','c'];
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #> array['a','1','b'];
 ?column? 
----------
 "cc"
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #> array['a','z','b'];
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json #> array['1','b'];
 ?column? 
----------
 "cc"
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json #> array['z','b'];
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": null}]'::json #> array['1','b'];
 ?column? 
----------
 null
(1 row)

select '"foo"'::json #> array['z'];
 ?column? 
----------
 
(1 row)

select '42'::json #> array['f2'];
 ?column? 
----------
 
(1 row)

select '42'::json #> array['0'];
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> '{}';
         ?column?          
---------------------------
 {"a": {"b":{"c": "foo"}}}
(1 row)

select '[1,2,3]'::json #>> '{}';
 ?column? 
----------
 [1,2,3]
(1 row)

select '"foo"'::json #>> '{}';
 ?column? 
----------
 foo
(1 row)

select '42'::json #>> '{}';
 ?column? 
----------
 42
(1 row)

select 'null'::json #>> '{}';
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a'];
      ?column?      
--------------------
 {"b":{"c": "foo"}}
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a', null];
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a', ''];
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','b'];
   ?column?   
--------------
 {"c": "foo"}
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','b','c'];
 ?column? 
----------
 foo
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','b','c','d'];
 ?column? 
----------
 
(1 row)

select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','z','c'];
 ?column? 
----------
 
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #>> array['a','1','b'];
 ?column? 
----------
 cc
(1 row)

select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #>> array['a','z','b'];
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json #>> array['1','b'];
 ?column? 
----------
 cc
(1 row)

select '[{"b": "c"}, {"b": "cc"}]'::json #>> array['z','b'];
 ?column? 
----------
 
(1 row)

select '[{"b": "c"}, {"b": null}]'::json #>> array['1','b'];
 ?column? 
----------
 
(1 row)

select '"foo"'::json #>> array['z'];
 ?column? 
----------
 
(1 row)

select '42'::json #>> array['f2'];
 ?column? 
----------
 
(1 row)

select '42'::json #>> array['0'];
 ?column? 
----------
 
(1 row)

-- array_elements
select json_array_elements('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]');
  json_array_elements  
-----------------------
 1
 true
 [1,[2,3]]
 null
 {"f1":1,"f2":[7,8,9]}
 false
 "stringy"
(7 rows)

select * from json_array_elements('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]') q;
         value         
-----------------------
 1
 true
 [1,[2,3]]
 null
 {"f1":1,"f2":[7,8,9]}
 false
 "stringy"
(7 rows)

select json_array_elements_text('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]');
 json_array_elements_text 
--------------------------
 1
 true
 [1,[2,3]]
 
 {"f1":1,"f2":[7,8,9]}
 false
 stringy
(7 rows)

select * from json_array_elements_text('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]') q;
         value         
-----------------------
 1
 true
 [1,[2,3]]
 
 {"f1":1,"f2":[7,8,9]}
 false
 stringy
(7 rows)

-- populate_record
create type jpop as (a text, b int, c timestamp);
select * from json_populate_record(null::jpop,'{"a":"blurfl","x":43.2}') q;
   a    | b | c 
--------+---+---
 blurfl |   | 
(1 row)

select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"a":"blurfl","x":43.2}') q;
   a    | b |            c             
--------+---+--------------------------
 blurfl | 3 | Mon Dec 31 15:30:56 2012
(1 row)

select * from json_populate_record(null::jpop,'{"a":"blurfl","x":43.2}') q;
   a    | b | c 
--------+---+---
 blurfl |   | 
(1 row)

select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"a":"blurfl","x":43.2}') q;
   a    | b |            c             
--------+---+--------------------------
 blurfl | 3 | Mon Dec 31 15:30:56 2012
(1 row)

select * from json_populate_record(null::jpop,'{"a":[100,200,false],"x":43.2}') q;
        a        | b | c 
-----------------+---+---
 [100,200,false] |   | 
(1 row)

select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"a":[100,200,false],"x":43.2}') q;
        a        | b |            c             
-----------------+---+--------------------------
 [100,200,false] | 3 | Mon Dec 31 15:30:56 2012
(1 row)

select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"c":[100,200,false],"x":43.2}') q;
ERROR:  invalid input syntax for type timestamp: "[100,200,false]"
-- populate_recordset
select * from json_populate_recordset(null::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
   a    | b |            c             
--------+---+--------------------------
 blurfl |   | 
        | 3 | Fri Jan 20 10:42:53 2012
(2 rows)

select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
   a    | b  |            c             
--------+----+--------------------------
 blurfl | 99 | 
 def    |  3 | Fri Jan 20 10:42:53 2012
(2 rows)

select * from json_populate_recordset(null::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
   a    | b |            c             
--------+---+--------------------------
 blurfl |   | 
        | 3 | Fri Jan 20 10:42:53 2012
(2 rows)

select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
   a    | b  |            c             
--------+----+--------------------------
 blurfl | 99 | 
 def    |  3 | Fri Jan 20 10:42:53 2012
(2 rows)

select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":[100,200,300],"x":43.2},{"a":{"z":true},"b":3,"c":"2012-01-20 10:42:53"}]') q;
       a       | b  |            c             
---------------+----+--------------------------
 [100,200,300] | 99 | 
 {"z":true}    |  3 | Fri Jan 20 10:42:53 2012
(2 rows)

select * from json_populate_recordset(row('def',99,null)::jpop,'[{"c":[100,200,300],"x":43.2},{"a":{"z":true},"b":3,"c":"2012-01-20 10:42:53"}]') q;
ERROR:  invalid input syntax for type timestamp: "[100,200,300]"
create type jpop2 as (a int, b json, c int, d int);
select * from json_populate_recordset(null::jpop2, '[{"a":2,"c":3,"b":{"z":4},"d":6}]') q;
 a |    b    | c | d 
---+---------+---+---
 2 | {"z":4} | 3 | 6
(1 row)

select * from json_populate_recordset(null::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
   a    | b |            c             
--------+---+--------------------------
 blurfl |   | 
        | 3 | Fri Jan 20 10:42:53 2012
(2 rows)

select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
   a    | b  |            c             
--------+----+--------------------------
 blurfl | 99 | 
 def    |  3 | Fri Jan 20 10:42:53 2012
(2 rows)

select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":[100,200,300],"x":43.2},{"a":{"z":true},"b":3,"c":"2012-01-20 10:42:53"}]') q;
       a       | b  |            c             
---------------+----+--------------------------
 [100,200,300] | 99 | 
 {"z":true}    |  3 | Fri Jan 20 10:42:53 2012
(2 rows)

-- handling of unicode surrogate pairs
select json '{ "a":  "\ud83d\ude04\ud83d\udc36" }' -> 'a' as correct_in_utf8;
      correct_in_utf8       
----------------------------
 "\ud83d\ude04\ud83d\udc36"
(1 row)

select json '{ "a":  "\ud83d\ud83d" }' -> 'a'; -- 2 high surrogates in a row
ERROR:  invalid input syntax for type json
DETAIL:  Unicode high surrogate must not follow a high surrogate.
CONTEXT:  JSON data, line 1: { "a":...
select json '{ "a":  "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
ERROR:  invalid input syntax for type json
DETAIL:  Unicode low surrogate must follow a high surrogate.
CONTEXT:  JSON data, line 1: { "a":...
select json '{ "a":  "\ud83dX" }' -> 'a'; -- orphan high surrogate
ERROR:  invalid input syntax for type json
DETAIL:  Unicode low surrogate must follow a high surrogate.
CONTEXT:  JSON data, line 1: { "a":...
select json '{ "a":  "\ude04X" }' -> 'a'; -- orphan low surrogate
ERROR:  invalid input syntax for type json
DETAIL:  Unicode low surrogate must follow a high surrogate.
CONTEXT:  JSON data, line 1: { "a":...
--handling of simple unicode escapes
select json '{ "a":  "the Copyright \u00a9 sign" }' as correct_in_utf8;
            correct_in_utf8            
---------------------------------------
 { "a":  "the Copyright \u00a9 sign" }
(1 row)

select json '{ "a":  "dollar \u0024 character" }' as correct_everywhere;
         correct_everywhere          
-------------------------------------
 { "a":  "dollar \u0024 character" }
(1 row)

select json '{ "a":  "dollar \\u0024 character" }' as not_an_escape;
            not_an_escape             
--------------------------------------
 { "a":  "dollar \\u0024 character" }
(1 row)

select json '{ "a":  "null \u0000 escape" }' as not_unescaped;
         not_unescaped          
--------------------------------
 { "a":  "null \u0000 escape" }
(1 row)

select json '{ "a":  "null \\u0000 escape" }' as not_an_escape;
          not_an_escape          
---------------------------------
 { "a":  "null \\u0000 escape" }
(1 row)

select json '{ "a":  "the Copyright \u00a9 sign" }' ->> 'a' as correct_in_utf8;
   correct_in_utf8    
----------------------
 the Copyright © sign
(1 row)

select json '{ "a":  "dollar \u0024 character" }' ->> 'a' as correct_everywhere;
 correct_everywhere 
--------------------
 dollar $ character
(1 row)

select json '{ "a":  "dollar \\u0024 character" }' ->> 'a' as not_an_escape;
      not_an_escape      
-------------------------
 dollar \u0024 character
(1 row)

select json '{ "a":  "null \u0000 escape" }' ->> 'a' as fails;
ERROR:  unsupported Unicode escape sequence
DETAIL:  \u0000 cannot be converted to text.
CONTEXT:  JSON data, line 1: { "a":...
select json '{ "a":  "null \\u0000 escape" }' ->> 'a' as not_an_escape;
   not_an_escape    
--------------------
 null \u0000 escape
(1 row)

--json_typeof() function
select value, json_typeof(value)
  from (values (json '123.4'),
               (json '-1'),
               (json '"foo"'),
               (json 'true'),
               (json 'false'),
               (json 'null'),
               (json '[1, 2, 3]'),
               (json '[]'),
               (json '{"x":"foo", "y":123}'),
               (json '{}'),
               (NULL::json))
      as data(value);
        value         | json_typeof 
----------------------+-------------
 123.4                | number
 -1                   | number
 "foo"                | string
 true                 | boolean
 false                | boolean
 null                 | null
 [1, 2, 3]            | array
 []                   | array
 {"x":"foo", "y":123} | object
 {}                   | object
                      | 
(11 rows)

-- json_build_array, json_build_object, json_object_agg
SELECT json_build_array('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
                           json_build_array                            
-----------------------------------------------------------------------
 ["a", 1, "b", 1.2, "c", true, "d", null, "e", {"x": 3, "y": [1,2,3]}]
(1 row)

SELECT json_build_object('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
                             json_build_object                              
----------------------------------------------------------------------------
 {"a" : 1, "b" : 1.2, "c" : true, "d" : null, "e" : {"x": 3, "y": [1,2,3]}}
(1 row)

SELECT json_build_object(
       'a', json_build_object('b',false,'c',99),
       'd', json_build_object('e',array[9,8,7]::int[],
           'f', (select row_to_json(r) from ( select relkind, oid::regclass as name from pg_class where relname = 'pg_class') r)));
                                        json_build_object                                        
-------------------------------------------------------------------------------------------------
 {"a" : {"b" : false, "c" : 99}, "d" : {"e" : [9,8,7], "f" : {"relkind":"r","name":"pg_class"}}}
(1 row)

-- empty objects/arrays
SELECT json_build_array();
 json_build_array 
------------------
 []
(1 row)

SELECT json_build_object();
 json_build_object 
-------------------
 {}
(1 row)

-- make sure keys are quoted
SELECT json_build_object(1,2);
 json_build_object 
-------------------
 {"1" : 2}
(1 row)

-- keys must be scalar and not null
SELECT json_build_object(null,2);
ERROR:  argument 1 cannot be null
HINT:  Object keys should be text.
SELECT json_build_object(r,2) FROM (SELECT 1 AS a, 2 AS b) r;
ERROR:  key value must be scalar, not array, composite, or json
SELECT json_build_object(json '{"a":1,"b":2}', 3);
ERROR:  key value must be scalar, not array, composite, or json
SELECT json_build_object('{1,2,3}'::int[], 3);
ERROR:  key value must be scalar, not array, composite, or json
CREATE TEMP TABLE foo (serial_num int, name text, type text);
INSERT INTO foo VALUES (847001,'t15','GE1043');
INSERT INTO foo VALUES (847002,'t16','GE1043');
INSERT INTO foo VALUES (847003,'sub-alpha','GESS90');
SELECT json_build_object('turbines',json_object_agg(serial_num,json_build_object('name',name,'type',type)))
FROM foo;
                                                                            json_build_object                                                                            
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 {"turbines" : { "847001" : {"name" : "t15", "type" : "GE1043"}, "847002" : {"name" : "t16", "type" : "GE1043"}, "847003" : {"name" : "sub-alpha", "type" : "GESS90"} }}
(1 row)

-- json_object
-- one dimension
SELECT json_object('{a,1,b,2,3,NULL,"d e f","a b c"}');
                      json_object                      
-------------------------------------------------------
 {"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
(1 row)

-- same but with two dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
                      json_object                      
-------------------------------------------------------
 {"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
(1 row)

-- odd number error
SELECT json_object('{a,b,c}');
ERROR:  array must have even number of elements
-- one column error
SELECT json_object('{{a},{b}}');
ERROR:  array must have two columns
-- too many columns error
SELECT json_object('{{a,b,c},{b,c,d}}');
ERROR:  array must have two columns
-- too many dimensions error
SELECT json_object('{{{a,b},{c,d}},{{b,c},{d,e}}}');
ERROR:  wrong number of array subscripts
--two argument form of json_object
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c"}');
                     json_object                      
------------------------------------------------------
 {"a" : "1", "b" : "2", "c" : "3", "d e f" : "a b c"}
(1 row)

-- too many dimensions
SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}', '{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
ERROR:  wrong number of array subscripts
-- mismatched dimensions
select json_object('{a,b,c,"d e f",g}','{1,2,3,"a b c"}');
ERROR:  mismatched array dimensions
select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c",g}');
ERROR:  mismatched array dimensions
-- null key error
select json_object('{a,b,NULL,"d e f"}','{1,2,3,"a b c"}');
ERROR:  null value not allowed for object key
-- empty key is allowed
select json_object('{a,b,"","d e f"}','{1,2,3,"a b c"}');
                     json_object                     
-----------------------------------------------------
 {"a" : "1", "b" : "2", "" : "3", "d e f" : "a b c"}
(1 row)

-- json_to_record and json_to_recordset
select * from json_to_record('{"a":1,"b":"foo","c":"bar"}')
    as x(a int, b text, d text);
 a |  b  | d 
---+-----+---
 1 | foo | 
(1 row)

select * from json_to_recordset('[{"a":1,"b":"foo","d":false},{"a":2,"b":"bar","c":true}]')
    as x(a int, b text, c boolean);
 a |  b  | c 
---+-----+---
 1 | foo | 
 2 | bar | t
(2 rows)

select * from json_to_recordset('[{"a":1,"b":{"d":"foo"},"c":true},{"a":2,"c":false,"b":{"d":"bar"}}]')
    as x(a int, b json, c boolean);
 a |      b      | c 
---+-------------+---
 1 | {"d":"foo"} | t
 2 | {"d":"bar"} | f
(2 rows)

-- json_strip_nulls
select json_strip_nulls(null);
 json_strip_nulls 
------------------
 
(1 row)

select json_strip_nulls('1');
 json_strip_nulls 
------------------
 1
(1 row)

select json_strip_nulls('"a string"');
 json_strip_nulls 
------------------
 "a string"
(1 row)

select json_strip_nulls('null');
 json_strip_nulls 
------------------
 null
(1 row)

select json_strip_nulls('[1,2,null,3,4]');
 json_strip_nulls 
------------------
 [1,2,null,3,4]
(1 row)

select json_strip_nulls('{"a":1,"b":null,"c":[2,null,3],"d":{"e":4,"f":null}}');
          json_strip_nulls          
------------------------------------
 {"a":1,"c":[2,null,3],"d":{"e":4}}
(1 row)

select json_strip_nulls('[1,{"a":1,"b":null,"c":2},3]');
  json_strip_nulls   
---------------------
 [1,{"a":1,"c":2},3]
(1 row)

-- an empty object is not null and should not be stripped
select json_strip_nulls('{"a": {"b": null, "c": null}, "d": {} }');
 json_strip_nulls 
------------------
 {"a":{},"d":{}}
(1 row)