对于mysql / hive 再进行统计的时候假设须要行变成列,能够使用函数 CASE 字段a WHEN 值b THEN c [WHEN d THEN e]* [ELSE f] END 当字段a=值b时,返回c(假设是字段的话则代表该字段的值,也能够是一个固定值 加单引號就能够):当a=d时,返回e.否则返回f. 如: 数据表结构:(举例说明.id有反复的) select id ,sum(CASE action when 'article' then count else 0 end) as
1. Scenario description when I use sqoop to import mysql table into hive, I got the following error: // :: WARN hcat.SqoopHCatUtilities: The Sqoop job can fail if types are not assignment compatible // :: WARN hcat.SqoopHCatUtilities: The HCatalog fi