通过roaring bitmap构建好的bitmap数据结构，目前还不支持直接插入到StarRocks的bitmap字段中。需要先转成string，写入到中间表，再利用bitmap_from_string函数导入到目标表中。
建表语句：
目标表

CREATE TABLE `test` (
  `col1` varchar(65533) NULL COMMENT "",
  `col2` bitmap BITMAP_UNION NULL COMMENT ""
) ENGINE=OLAP 
AGGREGATE KEY(`col1`)
COMMENT "OLAP"
DISTRIBUTED BY HASH(`col1`) BUCKETS 1 
PROPERTIES (
"replication_num" = "1",
"in_memory" = "false",
"storage_format" = "DEFAULT"
); 

中间表

CREATE TABLE `test1` (
  `col1` varchar(65533) NULL COMMENT "",
  `col2` varchar(65533) NULL COMMENT ""
) ENGINE=OLAP 
DUPLICATE KEY(`col1`)
COMMENT "OLAP"
DISTRIBUTED BY HASH(`col1`) BUCKETS 1 
PROPERTIES (
"replication_num" = "1",
"in_memory" = "false",
"storage_format" = "DEFAULT"
); 

python 生成 bitmap 并写入到StarRocks

from random import randrange
from requests import Session
from roaringbitmap import RoaringBitmap


class LoadSession(Session):
    def rebuild_auth(self, prepared_request, response):
        """
        No code here means requests will always preserve the Authorization
        header when redirected.
        """


def bitmap_generate():
    bitmap = RoaringBitmap()
    bitmap.add(randrange(99999999))
    bitmap.add(randrange(99999999))
    return bitmap


def main():
    """
    Stream load Demo with Standard Lib requests
    """
    username, password = 'root', ''
    headers = {
        "Content-Type": "text/html; charset=UTF-8",
        "connection": "keep-alive",
        "max_filter_ratio": "0.2",
        "columns": "col1, col2",
        "column_separator": '|',
        "Expect": "100-continue",
    }
    v1 = bitmap_generate()
    v2 = bitmap_generate()
    v3 = bitmap_generate()
    payload = 'k1|' + str(v1)[1:-1] + '\nk2|' + str(v2)[1:-1] + '\nk3|' + str(v3)[1:-1]
    database = 'bitmap_test'
    tablename = 'test1'
    api = 'http://localhost:18140/api/%s/%s/_stream_load' % (database, tablename)
    session = LoadSession()
    session.auth = (username, password)
    response = session.put(url=api, headers=headers, data=payload)
    print(response.json())


# Press the green button in the gutter to run the script.
if __name__ == '__main__':
    main()

使用 bitmap_from_string 函数写入目标表

insert into test select col1, bitmap_from_string(col2) from test1;

查看结果

select bitmap_to_string(col2) from test;