Apache pig 清管器脚本中的计数划分

我有上面的pig脚本代码，它计算两个计数。 现在我想将Chu计数除以Cau计数，并将其存储在一个文件中。

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如何做到这一点？

在Pig中没有方便的方法，但a可以帮助您：

清管器：

输出：

（0.66666666）

输入：

ch = LOAD 'ch.txt';
ch_all = GROUP ch ALL;
ch_count = FOREACH ch_all GENERATE 'same' AS key, (DOUBLE) COUNT(ch) AS ct;

ca = LOAD 'ca.txt';
ca_all = GROUP ca ALL;
ca_count = FOREACH ca_all GENERATE 'same' AS key, (DOUBLE) COUNT(ca) AS ct;

ca_ch = JOIN ch_count BY key, ca_count BY key;

ca_ch_div = FOREACH ca_ch GENERATE ch_count::ct / ca_count::ct;

DUMP ca_ch_div;

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如何将除法的输出截断为小数点后的两位数？一种方法是使用String.format（“%.2f”，number）进行自定义项。

ch = LOAD 'ch.txt';
ch_all = GROUP ch ALL;
ch_count = FOREACH ch_all GENERATE 'same' AS key, (DOUBLE) COUNT(ch) AS ct;

ca = LOAD 'ca.txt';
ca_all = GROUP ca ALL;
ca_count = FOREACH ca_all GENERATE 'same' AS key, (DOUBLE) COUNT(ca) AS ct;

ca_ch = JOIN ch_count BY key, ca_count BY key;

ca_ch_div = FOREACH ca_ch GENERATE ch_count::ct / ca_count::ct;

DUMP ca_ch_div;

cat ch.txt 
1
2
cat ca.txt 
1
2
3