我不确定你的意见是真的 tab delimited or space delimited . 基于上述输入，我假设 space 分隔的。
Pig手稿：

A = LOAD 'input' AS (line:chararray);
B = FOREACH A GENERATE FLATTEN(STRSPLIT(line,'\\s+')) AS (col1,col2);
C = GROUP B BY col1;
D = FOREACH C GENERATE group,FLATTEN(REPLACE(BagToString(B.$1.col2),'_',','));
STORE D INTO 'output';

输出：

1000026 4043055
1000033 4190903,4975983,4786543
1000043 4091523
1000044 4082383,4055371
1000045 4290571
1000046 5918892,5525001

上述输出将在 output/part* 文件。