explode_bitmap

description

表函数，需配合 Lateral View 使用。

展开一个bitmap类型。

语法：

explode_bitmap(bitmap)

example

原表数据：

mysql> select k1 from example1 order by k1;
+------+
| k1   |
+------+
|    1 |
|    2 |
|    3 |
|    4 |
|    5 |
|    6 |
+------+

Lateral View:

mysql> select k1, e1 from example1 lateral view explode_bitmap(bitmap_empty()) tmp1 as e1 order by k1, e1;
+------+------+
| k1   | e1   |
+------+------+
|    1 | NULL |
|    2 | NULL |
|    3 | NULL |
|    4 | NULL |
|    5 | NULL |
|    6 | NULL |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_bitmap(bitmap_from_string("1")) tmp1 as e1 order by k1, e1;
+------+------+
| k1   | e1   |
+------+------+
|    1 |    1 |
|    2 |    1 |
|    3 |    1 |
|    4 |    1 |
|    5 |    1 |
|    6 |    1 |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_bitmap(bitmap_from_string("1,2")) tmp1 as e1 order by k1, e1;
+------+------+
| k1   | e1   |
+------+------+
|    1 |    1 |
|    1 |    2 |
|    2 |    1 |
|    2 |    2 |
|    3 |    1 |
|    3 |    2 |
|    4 |    1 |
|    4 |    2 |
|    5 |    1 |
|    5 |    2 |
|    6 |    1 |
|    6 |    2 |
+------+------+
mysql> select k1, e1 from example1 lateral view explode_bitmap(bitmap_from_string("1,1000")) tmp1 as e1 order by k1, e1;
+------+------+
| k1   | e1   |
+------+------+
|    1 |    1 |
|    1 | 1000 |
|    2 |    1 |
|    2 | 1000 |
|    3 |    1 |
|    3 | 1000 |
|    4 |    1 |
|    4 | 1000 |
|    5 |    1 |
|    5 | 1000 |
|    6 |    1 |
|    6 | 1000 |
+------+------+
mysql> select k1, e1, e2 from example1
lateral view explode_bitmap(bitmap_from_string("1,1000")) tmp1 as e1
lateral view explode_split("a,b", ",") tmp2 as e2 order by k1, e1, e2;
+------+------+------+
| k1   | e1   | e2   |
+------+------+------+
|    1 |    1 | a    |
|    1 |    1 | b    |
|    1 | 1000 | a    |
|    1 | 1000 | b    |
|    2 |    1 | a    |
|    2 |    1 | b    |
|    2 | 1000 | a    |
|    2 | 1000 | b    |
|    3 |    1 | a    |
|    3 |    1 | b    |
|    3 | 1000 | a    |
|    3 | 1000 | b    |
|    4 |    1 | a    |
|    4 |    1 | b    |
|    4 | 1000 | a    |
|    4 | 1000 | b    |
|    5 |    1 | a    |
|    5 |    1 | b    |
|    5 | 1000 | a    |
|    5 | 1000 | b    |
|    6 |    1 | a    |
|    6 |    1 | b    |
|    6 | 1000 | a    |
|    6 | 1000 | b    |
+------+------+------+

keyword

explode_bitmap