Question

以下程序我试图在Apache Pig中使用它和非结构化数据

i）我有包含街道名称，城市和州的数据集：

ii）按州分组

iii）我在数据集中采用COUNT（*）状态现在我的o / p将像statename，count ===＆gt;数据集中该状态可用的时间

程序：

realestate = LOAD DATA using pigstorage(',') as (street:string,city string,state string);

A = GROUP realestate by state;
B= FOREACH A GENERATE group , count (*)

O / P就像

CA，14 华盛顿，20

现在我需要max（count）我的输出应该是＆＃34;华盛顿，20）

如何处理它。请帮助我解决问题

Answer 1

在生成的结果

上应用ORDER和LIMIT

realestate = LOAD DATA using pigstorage(',') as (street:string,city string,state string);
A = GROUP realestate by state;
B = FOREACH A GENERATE group , COUNT(realestate) as c;

# Arrange the tuples based on the count in descending order
D = order B by c desc;

# Apply limit on the ordered result to get the Max value
E = LIMIT D 1;

MAX（计数）功能apache猪拉丁语

1 个答案: