1.5 KiB
1.5 KiB
title, language
| title | language |
|---|---|
| bitmap_hash | en |
bitmap_hash
description
Syntax
BITMAP BITMAP_HASH(expr)
Compute the 32-bits hash value of a expr of any type, then return a bitmap containing that hash value. Mainly be used to load non-integer value into bitmap column, e.g.,
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