Merge branch 'rightlib' into mergelibs-241120-1113

1 files changed, 999 insertions, 0 deletions

diff --git a/yql/essentials/tests/postgresql/cases/json.out b/yql/essentials/tests/postgresql/cases/json.out
new file mode 100644
index 0000000000..218af2696a
--- /dev/null
+++ b/yql/essentials/tests/postgresql/cases/json.out
@@ -0,0 +1,999 @@
+-- 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...
+-- see json_encoding test for input with unicode escapes
+-- 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 '[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:     
+SELECT '{
+		"one": 1,
+		"two":,"two",  -- ERROR extraneous comma before field "two"
+		"three":
+		true}'::json;
+ERROR:  invalid input syntax for type json
+LINE 1: SELECT '{
+               ^
+DETAIL:  Expected JSON value, but found ",".
+CONTEXT:  JSON data, line 3: 		"two":,...
+SELECT '{
+		"one": 1,
+		"two":"two",
+		"averyveryveryveryveryveryveryveryveryverylongfieldname":}'::json;
+ERROR:  invalid input syntax for type json
+LINE 1: SELECT '{
+               ^
+DETAIL:  Expected JSON value, but found "}".
+CONTEXT:  JSON data, line 4: ...yveryveryveryveryveryveryveryverylongfieldname":}
+-- ERROR missing value for last field
+--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(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)
+
+BEGIN;
+SET LOCAL TIME ZONE 10.5;
+SET LOCAL TIME ZONE -8;
+COMMIT;
+-- 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 -> -1
+FROM test_json
+WHERE json_type = 'array';
+ ?column? 
+----------
+ {"f1":9}
+(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)
+
+-- 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 -> -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
+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 * 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)
+
+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 * 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)
+
+-- test type info caching in json_populate_record()
+CREATE TEMP TABLE jspoptest (js json);
+INSERT INTO jspoptest
+SELECT '{
+	"jsa": [1, "2", null, 4],
+	"rec": {"a": "abc", "c": "01.02.2003", "x": 43.2},
+	"reca": [{"a": "abc", "b": 456}, null, {"c": "01.02.2003", "x": 43.2}]
+}'::json
+FROM generate_series(1, 3);
+--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_array('a', NULL); -- ok
+ json_build_array 
+------------------
+ ["a", null]
+(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,b,c}'::text[]); -- error
+ERROR:  argument list must have even number of elements
+HINT:  The arguments of json_build_object() must consist of alternating keys and values.
+SELECT json_build_object('{a,b,c}'::text[], '{d,e,f}'::text[]); -- error, key cannot be array
+ERROR:  key value must be scalar, not array, composite, or json
+SELECT json_build_object('a', 'b', 'c'); -- error
+ERROR:  argument list must have even number of elements
+HINT:  The arguments of json_build_object() must consist of alternating keys and values.
+SELECT json_build_object(NULL, 'a'); -- error, key cannot be NULL
+ERROR:  argument 1 cannot be null
+HINT:  Object keys should be text.
+SELECT json_build_object('a', NULL); -- ok
+ json_build_object 
+-------------------
+ {"a" : null}
+(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)
+
+SELECT json_object_agg(name, type) FROM foo;
+                        json_object_agg                         
+----------------------------------------------------------------
+ { "t15" : "GE1043", "t16" : "GE1043", "sub-alpha" : "GESS90" }
+(1 row)
+
+INSERT INTO foo VALUES (999999, NULL, 'bar');
+SELECT json_object_agg(name, type) FROM foo;
+ERROR:  field name must not be null
+-- json_object
+-- empty object, one dimension
+SELECT json_object('{}');
+ json_object 
+-------------
+ {}
+(1 row)
+
+-- empty object, two dimensions
+SELECT json_object('{}', '{}');
+ json_object 
+-------------
+ {}
+(1 row)
+
+-- 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_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)
+