| --- |
| { |
| "title": "ARRAY_ENUMERATE", |
| "language": "en" |
| } |
| --- |
| |
| ## array_enumerate |
| |
| array_enumerate |
| |
| ### description |
| #### Syntax |
| |
| `ARRAY<T> array_enumerate(ARRAY<T> arr)` |
| |
| Returns array sub item indexes eg. [1, 2, 3, …, length (arr) ] |
| |
| ### example |
| |
| ```shell |
| mysql> create table array_type_table(k1 INT, k2 Array<STRING>) duplicate key (k1) |
| -> distributed by hash(k1) buckets 1 properties('replication_num' = '1'); |
| mysql> insert into array_type_table values (0, []), ("1", [NULL]), ("2", ["1", "2", "3"]), ("3", ["1", NULL, "3"]), ("4", NULL); |
| mysql> select k2, array_enumerate(k2) from array_type_table; |
| +------------------+-----------------------+ |
| | k2 | array_enumerate(`k2`) | |
| +------------------+-----------------------+ |
| | [] | [] | |
| | [NULL] | [1] | |
| | ['1', '2', '3'] | [1, 2, 3] | |
| | ['1', NULL, '3'] | [1, 2, 3] | |
| | NULL | NULL | |
| +------------------+-----------------------+ |
| 5 rows in set (0.01 sec) |
| ``` |
| |
| ### keywords |
| |
| ARRAY,ENUMERATE,ARRAY_ENUMERATE |
