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…
Halting due to Out Of Memory Error...18/09/13 21:42:17 INFO mapreduce.Job: Task Id : attempt_1536756558194_0031_m_000001_0, Status : FAILEDError: Java heap space18/09/13 21:43:26 INFO mapreduce.Job: Task Id : attempt_1536756558194_0031_m_000000_1, St…
=========查询分区的大小========= select d.NAME,t.TBL_NAME,p.PART_NAME,prm.PARAM_KEY,prm.PARAM_VALUE from TBLS t left join DBS d on t.DB_ID = d.DB_ID left join PARTITIONS p on t.TBL_ID = p.TBL_ID left join PARTITION_PARAMS prm on p.PART_ID=prm.PART_ID where…