bitmap_empty

返回一个空的 bitmap。它主要用于在插入或流式加载期间填充默认值。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

语法

BITMAP BITMAP_EMPTY()

示例

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

关键词

BITMAP_EMPTY,BITMAP