试图将值从表更新到另一个表,这两个表都具有相同的字段名但不同的值,查询必须在任何普通数据库上正常工作,但在这里返回
编译语句时出错:FAILED:ParseException第1:0行无法识别'MERGE''INTO''FINAL'附近的输入
MERGE
INTO FINAL
USING FIRST_STAGE
ON IMSI = FIRST_STAGE.IMSI and Site = FIRST_STAGE.Site
WHEN MATCHED THEN UPDATE SET
Min_Date = least(FIRST_STAGE.Min_Date, Min_Date),
Max_Date = greatest(FIRST_STAGE.Max_Date, Max_Date),
NoofDays = FIRST_STAGE.NoofDays + NoofDays,
Down_Link = FIRST_STAGE.Down_Link + Down_Link,
up_Link = FIRST_STAGE.up_Link + up_Link,
connection = FIRST_STAGE.connection + connection
WHEN NOT MATCHED THEN INSERT ( Min_Date,
Max_Date,
NoofDays,
IMSI,
Site,
Down_Link,
Up_Link,
Connection )
VALUES ( FIRST_STAGE.Min_Date,
FIRST_STAGE.Max_Date,
FIRST_STAGE.NoofDays,
FIRST_STAGE.IMSI,
FIRST_STAGE.Site,
FIRST_STAGE.Down_Link,
FIRST_STAGE.Up_Link,
FIRST_STAGE.Connection )
Hive合并声明在Hortonworks distribution
中引入。
merge statement
运行的先决条件是:
需要使用transactional enabled ,ORC format ,and bucketed
创建决赛桌。AFAIK在Cloudera distribution
的情况下,我们需要使用Kudu
从cloudera-5.10+
开始执行upsert操作。
注意:Upsert statement only works for Impala tables that use the Kudu storage engine.
CDH
发行版中的帖子中提到合并语句。