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Add json_strip_nulls and jsonb_strip_nulls functions.

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The functions remove object fields, including in nested objects, that
have null as a value. In certain cases this can lead to considerably
smaller datums, with no loss of semantic information.

Andrew Dunstan, reviewed by Pavel Stehule.
This commit is contained in:
Andrew Dunstan
2014-12-12 09:00:43 -05:00
parent b1332e98c4
commit 237a882443
11 changed files with 467 additions and 1 deletions
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20
src/test/regress/sql/json.sql
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@ -509,3 +509,23 @@ select * from json_to_recordset('[{"a":1,"b":"foo","d":false},{"a":2,"b":"bar","
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);
-- json_strip_nulls
select json_strip_nulls(null);
select json_strip_nulls('1');
select json_strip_nulls('"a string"');
select json_strip_nulls('null');
select json_strip_nulls('[1,2,null,3,4]');
select json_strip_nulls('{"a":1,"b":null,"c":[2,null,3],"d":{"e":4,"f":null}}');
select json_strip_nulls('[1,{"a":1,"b":null,"c":2},3]');
-- an empty object is not null and should not be stripped
select json_strip_nulls('{"a": {"b": null, "c": null}, "d": {} }');