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bitmap_hash

description

Syntax

BITMAP BITMAP_HASH(expr)

Calculate a 32-bit hash value for any type of input and return the bitmap containing the hash value. It is mainly used for the stream load task to import non integer fields into the bitmap field of the StarRocks table. For example:

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

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