bitmap_to_string
description
Syntax
VARCHAR BITMAP_TO_STRING(BITMAP input)
将一个bitmap转化成一个逗号分隔的字符串，字符串中包含所有设置的BIT位。输入是null的话会返回null。
example
mysql> select bitmap_to_string(null);
+------------------------+
| bitmap_to_string(NULL) |
+------------------------+
| NULL |
+------------------------+
mysql> select bitmap_to_string(bitmap_empty());
+----------------------------------+
| bitmap_to_string(bitmap_empty()) |
+----------------------------------+
| |
+----------------------------------+
mysql> select bitmap_to_string(to_bitmap(1));
+--------------------------------+
| bitmap_to_string(to_bitmap(1)) |
+--------------------------------+
| 1 |
+--------------------------------+
mysql> select bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2)));
+---------------------------------------------------------+
| bitmap_to_string(bitmap_or(to_bitmap(1), to_bitmap(2))) |
+---------------------------------------------------------+
| 1,2 |
+---------------------------------------------------------+
keywords
BITMAP_TO_STRING,BITMAP