Skip to main content
Version: Latest-3.2

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)