bitmap_empty

bitmap_empty

description

Syntax

BITMAP BITMAP_EMPTY()

返回一个空bitmap。主要用于 insert 或 stream load 时填充默认值。例如

cat data | curl --location-trusted -u user:passwd -T - -H "columns: dt,page,v1,v2=bitmap_empty()"   http://host:8410/api/test/testDb/_stream_load

example

mysql> select bitmap_count(bitmap_empty());
+------------------------------+
| bitmap_count(bitmap_empty()) |
+------------------------------+
|                            0 |
+------------------------------+

mysql> select bitmap_to_string(bitmap_empty());
+----------------------------------+
| bitmap_to_string(bitmap_empty()) |
+----------------------------------+
|                                  |
+----------------------------------+

keywords

BITMAP_EMPTY,BITMAP