如果是空袋子的问题，那么你可以尝试这样的方法：（未测试）

raw = load file;

words = FOREACH raw GENERATE TOKENIZE(*) as tokenized_words;

counts = FOREACH words GENERATE ((tokenized_words IS null or TRIM(tokenized_words) == '') ? 0 : COUNT(*)) as total_count;

在这里，我们编写if else条件来检查标记化的单词是null还是空的，如果是，那么我们为它赋值零，否则就是总计数。

你能这样试试吗？
输入

Hi hello how are you
this is apache pig
works

like a charm

Pig手稿：

A = LOAD 'input' AS (line:chararray);
B = FOREACH A GENERATE TOKENIZE(line);
C = FOREACH B GENERATE COUNT($0);
DUMP C;

输出：

(5)
(4)
(1)
()
(3)