ccaa97a5ac
This CL make bitmap_count, bitmap_union, and bitmap_union_count accept any expression whose return type is bitmap as input so that we can support flexible bitmap expression such as bitmap_count(bitmap_and(to_bitmap(1), to_bitmap(2))). This CL also create separate documentation for each bitmap UDF to conform with other functions.
1.5 KiB
1.5 KiB
bitmap_hash
description
Syntax
BITMAP BITMAP_HASH(expr)
对任意类型的输入计算32位的哈希值，返回包含该哈希值的bitmap。主要用于stream load任务将非整型字段导入Doris表的bitmap字段。例如
cat data | curl --location-trusted -u user:passwd -T - -H "columns: dt,page,device_id, device_id=bitmap_hash(device_id)" http://host:8410/api/test/testDb/_stream_load
example
mysql> select bitmap_count(bitmap_hash('hello'));
+------------------------------------+
| bitmap_count(bitmap_hash('hello')) |
+------------------------------------+
| 1 |
+------------------------------------+
keyword
BITMAP_HASH,BITMAP