bitmap_count

description

Syntax

BITMAP BITMAP_COUNT(BITMAP lhs)

返回输入bitmap的个数。

example

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

keywords

BITMAP_COUNT