[GitHub] [incubator-doris] HangyuanLiu opened a new issue #1897: HLL column may store null value

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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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