bitmap_or_count
description
Syntax
BigIntVal bitmap_or_count(BITMAP lhs, BITMAP rhs, ...)
计算两个及以上输入bitmap的并集，返回并集的个数.
example
MySQL> select bitmap_or_count(bitmap_from_string('1,2,3'),bitmap_empty());
+--------------------------------------------------------------+
| bitmap_or_count(bitmap_from_string('1,2,3'), bitmap_empty()) |
+--------------------------------------------------------------+
| 3 |
+--------------------------------------------------------------+
MySQL> select bitmap_or_count(bitmap_from_string('1,2,3'),bitmap_from_string('1,2,3'));
+---------------------------------------------------------------------------+
| bitmap_or_count(bitmap_from_string('1,2,3'), bitmap_from_string('1,2,3')) |
+---------------------------------------------------------------------------+
| 3 |
+---------------------------------------------------------------------------+
MySQL> select bitmap_or_count(bitmap_from_string('1,2,3'),bitmap_from_string('3,4,5'));
+---------------------------------------------------------------------------+
| bitmap_or_count(bitmap_from_string('1,2,3'), bitmap_from_string('3,4,5')) |
+---------------------------------------------------------------------------+
| 5 |
+---------------------------------------------------------------------------+
MySQL> select bitmap_or_count(bitmap_from_string('1,2,3'), bitmap_from_string('3,4,5'), to_bitmap(100), bitmap_empty());
+-----------------------------------------------------------------------------------------------------------+
| bitmap_or_count(bitmap_from_string('1,2,3'), bitmap_from_string('3,4,5'), to_bitmap(100), bitmap_empty()) |
+-----------------------------------------------------------------------------------------------------------+
| 6 |
+-----------------------------------------------------------------------------------------------------------+
MySQL> select bitmap_or_count(bitmap_from_string('1,2,3'), bitmap_from_string('3,4,5'), to_bitmap(100), NULL);
+-------------------------------------------------------------------------------------------------+
| bitmap_or_count(bitmap_from_string('1,2,3'), bitmap_from_string('3,4,5'), to_bitmap(100), NULL) |
+-------------------------------------------------------------------------------------------------+
| NULL |
+-------------------------------------------------------------------------------------------------+keywords
BITMAP_OR_COUNT,BITMAP