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bitmap_and_count

bitmap_and_count

description

Syntax

BigIntVal bitmap_and_count(BITMAP lhs, BITMAP rhs, ...)

Calculate the intersection of two or more input bitmaps and return the number of intersections.

example

MySQL> select bitmap_and_count(bitmap_from_string('1,2,3'),bitmap_empty());
+---------------------------------------------------------------+
| bitmap_and_count(bitmap_from_string('1,2,3'), bitmap_empty()) |
+---------------------------------------------------------------+
| 0 |
+---------------------------------------------------------------+


MySQL> select bitmap_and_count(bitmap_from_string('1,2,3'),bitmap_from_string('1,2,3'));
+----------------------------------------------------------------------------+
| bitmap_and_count(bitmap_from_string('1,2,3'), bitmap_from_string('1,2,3')) |
+----------------------------------------------------------------------------+
| 3 |
+----------------------------------------------------------------------------+

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

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

MySQL> select bitmap_and_count(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'),bitmap_empty());
+-----------------------------------------------------------------------------------------------------------------------------+
| (bitmap_and_count(bitmap_from_string('1,2,3'), bitmap_from_string('1,2'), bitmap_from_string('1,2,3,4,5'), bitmap_empty())) |
+-----------------------------------------------------------------------------------------------------------------------------+
| 0 |
+-----------------------------------------------------------------------------------------------------------------------------+

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

keywords

BITMAP_AND_COUNT,BITMAP