EXPLODE_JSON_ARRAY_JSON

Description

The explode_json_array_json table function accepts a JSON array. Its implementation logic is to convert the JSON array to an array type and then call the explode_outer function for processing. The behavior is equivalent to: explode(cast(<json_array> as Array<JSON>)). It should be used together with LATERAL VIEW.

Syntax

EXPLODE_JSON_ARRAY_JSON(<json>)

Parameters

• <json> JSON type, the content should be an array.

Return Value

• Returns a single-column, multi-row result composed of all elements in <json>. The column type is Nullable<JSON>.
• If <json> is NULL or an empty array (number of elements is 0), 0 rows are returned.

Examples

0. Prepare data
   create table example(
       k1 int
   ) properties(
       "replication_num" = "1"
   );
   
   insert into example values(1);

1. Regular parameters
   select * from example lateral view explode_json_array_json('[4, "abc", {"key": "value"}, 5.23, null]') t2 as c;

   +------+-----------------+
   | k1   | c               |
   +------+-----------------+
   |    1 | 4               |
   |    1 | NULL            |
   |    1 | {"key":"value"} |
   |    1 | 5.23            |
   |    1 | NULL            |
   +------+-----------------+

2. Empty array
   select * from example lateral view explode_json_array_json('[]') t2 as c;

   Empty set (0.03 sec)

3. NULL parameter
   select * from example lateral view explode_json_array_json(NULL) t2 as c;

   Empty set (0.03 sec)

4. Non-array parameter
   select * from example lateral view explode_json_array_json('{}') t2 as c;

   Empty set (0.03 sec)