explode_json_array
description
表函数，需配合 Lateral View 使用。
展开一个 json 数组。根据数组元素类型，有三种函数名称。分别对应整型、浮点和字符串数组。
syntax
explode_json_array_int(json_str)
explode_json_array_double(json_str)
explode_json_array_string(json_str)
explode_json_array_json(json_str)example
原表数据：
mysql> select k1, e1 from example1 lateral view explode_json_array_int('[]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_int('[1,2,3]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | 1 |
| 1 | 2 |
| 1 | 3 |
| 2 | 1 |
| 2 | 2 |
| 2 | 3 |
| 3 | 1 |
| 3 | 2 |
| 3 | 3 |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_int('[1,"b",3]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 1 | 1 |
| 1 | 3 |
| 2 | NULL |
| 2 | 1 |
| 2 | 3 |
| 3 | NULL |
| 3 | 1 |
| 3 | 3 |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_int('["a","b","c"]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 1 | NULL |
| 1 | NULL |
| 2 | NULL |
| 2 | NULL |
| 2 | NULL |
| 3 | NULL |
| 3 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_int('{"a": 3}') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_double('[]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_double('[1,2,3]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 1 | NULL |
| 1 | NULL |
| 2 | NULL |
| 2 | NULL |
| 2 | NULL |
| 3 | NULL |
| 3 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_double('[1,"b",3]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 1 | NULL |
| 1 | NULL |
| 2 | NULL |
| 2 | NULL |
| 2 | NULL |
| 3 | NULL |
| 3 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_double('[1.0,2.0,3.0]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | 1 |
| 1 | 2 |
| 1 | 3 |
| 2 | 1 |
| 2 | 2 |
| 2 | 3 |
| 3 | 1 |
| 3 | 2 |
| 3 | 3 |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_double('[1,"b",3]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 1 | NULL |
| 1 | NULL |
| 2 | NULL |
| 2 | NULL |
| 2 | NULL |
| 3 | NULL |
| 3 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_double('["a","b","c"]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 1 | NULL |
| 1 | NULL |
| 2 | NULL |
| 2 | NULL |
| 2 | NULL |
| 3 | NULL |
| 3 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_double('{"a": 3}') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_string('[]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_string('[1.0,2.0,3.0]') tmp1 as e1 order by k1, e1;
+------+----------+
| k1 | e1 |
+------+----------+
| 1 | 1.000000 |
| 1 | 2.000000 |
| 1 | 3.000000 |
| 2 | 1.000000 |
| 2 | 2.000000 |
| 2 | 3.000000 |
| 3 | 1.000000 |
| 3 | 2.000000 |
| 3 | 3.000000 |
+------+----------+
mysql> select k1, e1 from example1 lateral view explode_json_array_string('[1,"b",3]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | 1 |
| 1 | 3 |
| 1 | b |
| 2 | 1 |
| 2 | 3 |
| 2 | b |
| 3 | 1 |
| 3 | 3 |
| 3 | b |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_string('["a","b","c"]') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | a |
| 1 | b |
| 1 | c |
| 2 | a |
| 2 | b |
| 2 | c |
| 3 | a |
| 3 | b |
| 3 | c |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_string('{"a": 3}') tmp1 as e1 order by k1, e1;
+------+------+
| k1 | e1 |
+------+------+
| 1 | NULL |
| 2 | NULL |
| 3 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_json_array_json('[{"id":1,"name":"John"},{"id":2,"name":"Mary"},{"id":3,"name":"Bob"}]') tmp1 as e1 order by k1, e1;
+------+------------------------+
| k1 | e1 |
+------+------------------------+
| 1 | {"id":1,"name":"John"} |
| 1 | {"id":2,"name":"Mary"} |
| 1 | {"id":3,"name":"Bob"} |
| 2 | {"id":1,"name":"John"} |
| 2 | {"id":2,"name":"Mary"} |
| 2 | {"id":3,"name":"Bob"} |
| 3 | {"id":1,"name":"John"} |
| 3 | {"id":2,"name":"Mary"} |
| 3 | {"id":3,"name":"Bob"} |
+------+------------------------+keywords
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