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