HangyuanLiu opened a new issue #1897: HLL column may store null value URL: https://github.com/apache/incubator-doris/issues/1897 **Describe the bug** HLL column may store null value **To Reproduce** Steps to reproduce the behavior: 1、 CREATE TABLE `test_uv_13` ( `pin_id` bigint(20) NOT NULL COMMENT "", `id` bigint(20) NULL COMMENT "", `uv1` hll HLL_UNION NOT NULL COMMENT "", `uv2` hll HLL_UNION NOT NULL COMMENT "" ) ENGINE=OLAP AGGREGATE KEY(`pin_id`, `id`) DISTRIBUTED BY HASH(`pin_id`) BUCKETS 16 PROPERTIES ( "storage_type" = "COLUMN" ) 2、 insert into test_uv_13 (pin_id,id) values(1,2); 3、select hll_union_agg(uv1) from test_uv_13; This select statement may result in crash There are several problems with this scenario **1. Why does the created table have default value in HLL 2. Why can the import succeed when the default value is 0 3. Why be crash when select**
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