| --- |
| { |
| "title": "BITMAP_HASH64", |
| "language": "en" |
| } |
| --- |
| |
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| |
| ## bitmap_hash64 |
| ### description |
| #### Syntax |
| |
| `BITMAP BITMAP_HASH64(expr)` |
| |
| Compute the 64-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_hash64(device_id)" http://host:8410/api/test/testDb/_stream_load |
| ``` |
| |
| ### example |
| |
| ``` |
| mysql> select bitmap_to_string(bitmap_hash64('hello')); |
| +------------------------------------------+ |
| | bitmap_to_string(bitmap_hash64('hello')) | |
| +------------------------------------------+ |
| | 15231136565543391023 | |
| +------------------------------------------+ |
| ``` |
| |
| ### keywords |
| |
| BITMAP_HASH,BITMAP |
