bitmap_or_count
Description
Syntax:
BigIntVal bitmap_or_count(BITMAP lhs, BITMAP rhs)
This function calculates the unions of two or more input bitmaps and returns the number of unions.
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