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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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src/include/utils/json.h
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@ -63,6 +63,7 @@ extern Datum json_populate_record(PG_FUNCTION_ARGS);
extern Datum json_populate_recordset(PG_FUNCTION_ARGS);
extern Datum json_to_record(PG_FUNCTION_ARGS);
extern Datum json_to_recordset(PG_FUNCTION_ARGS);
extern Datum json_strip_nulls(PG_FUNCTION_ARGS);
extern Datum jsonb_object_field(PG_FUNCTION_ARGS);
extern Datum jsonb_object_field_text(PG_FUNCTION_ARGS);
@ -80,5 +81,6 @@ extern Datum jsonb_populate_record(PG_FUNCTION_ARGS);
extern Datum jsonb_populate_recordset(PG_FUNCTION_ARGS);
extern Datum jsonb_to_record(PG_FUNCTION_ARGS);
extern Datum jsonb_to_recordset(PG_FUNCTION_ARGS);
extern Datum jsonb_strip_nulls(PG_FUNCTION_ARGS);
#endif /* JSON_H */