bitmap_to_base64
description
Syntax
VARCHAR BITMAP_TO_BASE64(BITMAP input)
Convert an input BITMAP to a base64 string. If input is null, return null. Since BE config item enable_set_in_bitmap_value will change the format of bitmap value in memory, it also affect the result of this function.
Since the order of elements in the bitmap cannot be guaranteed, there is no guarantee that the base64 results generated by bitmaps with the same content are always the same, but the bitmap after bitmap_from_base64 decoding can be guaranteed to be the same.
example
mysql> select bitmap_to_base64(null);
+------------------------+
| bitmap_to_base64(NULL) |
+------------------------+
| NULL |
+------------------------+
mysql> select bitmap_to_base64(bitmap_empty());
+----------------------------------+
| bitmap_to_base64(bitmap_empty()) |
+----------------------------------+
| AA== |
+----------------------------------+
mysql> select bitmap_to_base64(to_bitmap(1));
+--------------------------------+
| bitmap_to_base64(to_bitmap(1)) |
+--------------------------------+
| AQEAAAA= |
+--------------------------------+
mysql> select bitmap_to_base64(bitmap_from_string("1,9999999"));
+---------------------------------------------------------+
| bitmap_to_base64(bitmap_from_string("1,9999999")) |
+---------------------------------------------------------+
| AjowAAACAAAAAAAAAJgAAAAYAAAAGgAAAAEAf5Y= |
+---------------------------------------------------------+
keywords
BITMAP_TO_BASE64,BITMAP