to_bitmap

输入是无符号 bigint，值的范围从 0 到 18446744073709551615，输出是包含此元素的 bitmap。此函数主要用于流式加载任务，将整数字段导入到 StarRocks 表的 bitmap 字段中。例如

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

语法

BITMAP TO_BITMAP(expr)

示例

MySQL > select bitmap_count(to_bitmap(10));
+-----------------------------+
| bitmap_count(to_bitmap(10)) |
+-----------------------------+
|                           1 |
+-----------------------------+

select bitmap_to_string(to_bitmap(10));
+---------------------------------+
| bitmap_to_string(to_bitmap(10)) |
+---------------------------------+
| 10                              |
+---------------------------------+

select bitmap_to_string(to_bitmap(-5));
+---------------------------------+
| bitmap_to_string(to_bitmap(-5)) |
+---------------------------------+
| NULL                            |
+---------------------------------+

select bitmap_to_string(to_bitmap(null));
+-----------------------------------+
| bitmap_to_string(to_bitmap(NULL)) |
+-----------------------------------+
| NULL                              |
+-----------------------------------+

关键词

TO_BITMAP,BITMAP