bitmap_or

bitmap_or

description

Syntax

BITMAP BITMAP_OR(BITMAP lhs, BITMAP rhs, ...)

计算两个及以上的输入bitmap的并集，返回新的bitmap.

example

mysql> select bitmap_count(bitmap_or(to_bitmap(1), to_bitmap(2))) cnt;
+------+
| cnt  |
+------+
|    2 |
+------+

mysql> select bitmap_count(bitmap_or(to_bitmap(1), to_bitmap(1))) cnt;
+------+
| cnt  |
+------+
|    1 |
+------+

MySQL> select bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2)));
+---------------------------------------------------------+
| bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2))) |
+---------------------------------------------------------+
| 1,2                                                     |
+---------------------------------------------------------+

MySQL> select bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2), to_bitmap(10), to_bitmap(0), NULL));
+--------------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2), to_bitmap(10), to_bitmap(0), NULL)) |
+--------------------------------------------------------------------------------------------+
| NULL                                                                                       |
+--------------------------------------------------------------------------------------------+

MySQL> select bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2), to_bitmap(10), to_bitmap(0), bitmap_empty()));
+------------------------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2), to_bitmap(10), to_bitmap(0), bitmap_empty())) |
+------------------------------------------------------------------------------------------------------+
| 0,1,2,10                                                                                             |
+------------------------------------------------------------------------------------------------------+

MySQL> select bitmap_to_string(bitmap_or(to_bitmap(10), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5')));
+--------------------------------------------------------------------------------------------------------+
| bitmap_to_string(bitmap_or(to_bitmap(10), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'))) |
+--------------------------------------------------------------------------------------------------------+
| 1,2,3,4,5,10                                                                                           |
+--------------------------------------------------------------------------------------------------------+

keywords

BITMAP_OR,BITMAP