bitmap_xor_count

bitmap_xor_count

description

Syntax

BIGINT BITMAP_XOR_COUNT(BITMAP lhs, BITMAP rhs, ...)

将两个及以上bitmap集合进行异或操作并返回结果集的大小

example

mysql> select bitmap_xor_count(bitmap_from_string('1,2,3'),bitmap_from_string('3,4,5'));
+----------------------------------------------------------------------------+
| bitmap_xor_count(bitmap_from_string('1,2,3'), bitmap_from_string('3,4,5')) |
+----------------------------------------------------------------------------+
|                                                                          4 |
+----------------------------------------------------------------------------+

mysql> select bitmap_xor_count(bitmap_from_string('1,2,3'),bitmap_from_string('1,2,3'));
+----------------------------------------------------------------------------+
| bitmap_xor_count(bitmap_from_string('1,2,3'), bitmap_from_string('1,2,3')) |
+----------------------------------------------------------------------------+
|                                                                          0 |
+----------------------------------------------------------------------------+

mysql> select bitmap_xor_count(bitmap_from_string('1,2,3'),bitmap_from_string('4,5,6'));
+----------------------------------------------------------------------------+
| bitmap_xor_count(bitmap_from_string('1,2,3'), bitmap_from_string('4,5,6')) |
+----------------------------------------------------------------------------+
|                                                                          6 |
+----------------------------------------------------------------------------+

MySQL> select (bitmap_xor_count(bitmap_from_string('2,3'),bitmap_from_string('1,2,3,4'),bitmap_from_string('3,4,5')));
+-----------------------------------------------------------------------------------------------------------+
| (bitmap_xor_count(bitmap_from_string('2,3'), bitmap_from_string('1,2,3,4'), bitmap_from_string('3,4,5'))) |
+-----------------------------------------------------------------------------------------------------------+
|                                                                                                         3 |
+-----------------------------------------------------------------------------------------------------------+

MySQL> select (bitmap_xor_count(bitmap_from_string('2,3'),bitmap_from_string('1,2,3,4'),bitmap_from_string('3,4,5'),bitmap_empty()));
+---------------------------------------------------------------------------------------------------------------------------+
| (bitmap_xor_count(bitmap_from_string('2,3'), bitmap_from_string('1,2,3,4'), bitmap_from_string('3,4,5'), bitmap_empty())) |
+---------------------------------------------------------------------------------------------------------------------------+
|                                                                                                                         3 |
+---------------------------------------------------------------------------------------------------------------------------+

MySQL> select (bitmap_xor_count(bitmap_from_string('2,3'),bitmap_from_string('1,2,3,4'),bitmap_from_string('3,4,5'),NULL));
+-----------------------------------------------------------------------------------------------------------------+
| (bitmap_xor_count(bitmap_from_string('2,3'), bitmap_from_string('1,2,3,4'), bitmap_from_string('3,4,5'), NULL)) |
+-----------------------------------------------------------------------------------------------------------------+
|                                                                                                            NULL |
+-----------------------------------------------------------------------------------------------------------------+

keywords

BITMAP_XOR_COUNT,BITMAP