Question

我正在尝试合并一堆表，其中一些字段是bigint类型的数组。当我尝试在Hive中投射这些内容时，它会一直给我一个“表达式不在GROUP BY键'field_name'中。”

我的代码如下：

    CREATE TABLE sample_table stored AS avro AS 
    SELECT cast(cast(rand()* 1000000000000000000 AS BIGINT) AS string)        id, 
           'PERSON'AS person, 
           name AS name, 
           age AS age, 
           gender AS gender
FROM   table_a
UNION ALL 
SELECT cast(cast(rand()* 1000000000000000000 AS BIGINT) AS string)    id,  
          'PERSON'AS person, 
           name AS name, 
           collect_list(
    CAST(NULL AS BIGINT)
  ) AS age, 
           null AS gender
FROM   table_b

正在生成的错误如下：

SQL错误[500051] [HY000]：[Cloudera] HiveJDBCDriver错误正在处理查询/语句。错误代码：10025，SQL状态：TStatus（statusCode：ERROR_STATUS，infoMessages：[* org.apache.hive.service.cli.HiveSQLException：编译语句时发生错误：FAILED：SemanticException [Error 10025]：第4：7行表达式不在GROUP BY键'age'：28：27，org.apache.hive.service.cli.operation.Operation：toSQLException：Operation.java：400，org.apache.hive.service.cli.operation.SQLOperation：prepare：SQLOperation .java：187

Answer 1

collect_list是聚合功能。您需要group by每个非常数字段。

SELECT cast(cast(rand()* 1000000000000000000 AS BIGINT) AS string)    id,  
          'PERSON'AS person, 
           name, 
           collect_list(CAST(NULL AS BIGINT)) AS age, 
           null AS gender
FROM   table_b
group by cast(cast(rand()* 1000000000000000000 AS BIGINT) AS string), name

无法将字段创建转换为bigint

1 个答案: