如果您想计算输入中的所有记录，则需要使用group all，这将创建一个包。出于性能原因，它还使用了累加器distinct函数org.apache.pig.builtin.distinct

X = load 'path' as (fqdn:chararray,ip:chararray,date:chararray,time:chararray,uri:chararray,ua:chararray);
IPs = FOREACH X GENERATE ip; // project early for performance reasons
GRP = group IPs all;
OUT = foreach GRP generate COUNT(IPs) as all_cnt, COUNT(org.apache.pig.builtin.Distinct(IPs.ip)) as distinct_cnt;

如果IP太多，并且出现与内存相关的异常，则可以执行以下操作：

X = load 'path' as (fqdn:chararray,ip:chararray,date:chararray,time:chararray,uri:chararray,ua:chararray);
IPs = FOREACH X GENERATE ip; // project early for performance reasons
Dist_IPs = distinct IPs;
GRP_DIST = group Dist_IPs all;
DIST = foreach GRP_DIST generate COUNT(GRP_DIST) as cnt, 'dist' as category;

GRP_ALL = group IPs all;
ALL = foreach GRP_ALL generate COUNT(GRP_ALL)as cnt, 'all' as category;

OUT = union DIST, ALL;