bitmap_max
Description
Obtains the maximum value of a bitmap. If the bitmap is NULL
, this function returns NULL
. If the bitmap is empty, this function returns NULL
by default.
Syntax
bitmap_max(bitmap)
Parameters
bitmap
: the bitmap whose maximum value you want to obtain. Only the BITMAP data type is supported. You can specify a bitmap that you construct by using functions such as bitmap_from_string.
Return value
Returns a value of the LARGEINT data type.
Examples
MySQL > select bitmap_max(bitmap_from_string("0, 1, 2, 3"));
+-------------------------------------------------+
| bitmap_max(bitmap_from_string("0, 1, 2, 3")) |
+-------------------------------------------------+
| 3 |
+-------------------------------------------------+
MySQL > select bitmap_max(bitmap_from_string("-1, 0, 1, 2"));
+-------------------------------------------------+
| bitmap_max(bitmap_from_string("-1, 0, 1, 2")) |
+-------------------------------------------------+
| NULL |
+-------------------------------------------------+
MySQL > select bitmap_max(bitmap_empty());
+----------------------------------+
| bitmap_max(bitmap_empty()) |
+----------------------------------+
| NULL |
+----------------------------------+
mysql> select bitmap_max(bitmap_from_string("1, 16501189037412846863"));
+--------------------------------------------------------------+
| bitmap_max(bitmap_from_string('1, 16501189037412846863')) |
+--------------------------------------------------------------+
| 16501189037412846863 |
+--------------------------------------------------------------+
1 row in set (0.02 sec)