Group data column side into single dataset in pig - group-by

Question

I have data like
(1,a,null)
(4,b,null)
(7,c,null)
(1,a,3)
(4,b,6)
(7,c,9)
I want distinct value and its count for each column like
(1,2)
(4,2)
(7,2)
(a,2)
(b,2)
(c,2)
(null,3)
(3,1)
(6,1)
(9,1)
Where as first 3 records are distinct value and its count in first, next 3 records are distinct value and its count in second record and last 4 records are distinct value and its count in last column.
For this I am trying to group the values by columns individually like
x = load 'path/to/file' using PigStorage(',') AS (col1:int,col2:chararray,col3:chararray);
B1 = GROUP x by col1;
B2 = GROUP x by col2;
B3 = GROUP x by col3;
C1 = FOREACH B1 GENERATE $0 as col1:chararray,COUNT(x);
C2 = FOREACH B2 GENERATE $0 as col2:chararray,COUNT(x);
C3 = FOREACH B3 GENERATE $0 as col3:chararray,COUNT(x);
This is giving the data separately:
C1 result is:
(1,{(1,a,null),(1,a,null)})
(4,{(4,b,null),(4,b,6)})
(7,{(7,c,null),(7,c,9)})
C2 result is:
(a,{(1,a,null),(1,a,3)})
(b,{(4,b,null),(4,b,6)})
(c,{(7,c,null),(7,c,9)})
C3 result is:
(null,{(1,a,null),(4,b,null),(7,c,null)})
(3,{(1,a,3)})
(6,{(4,b,6)})
(7,{(7,c,9)})
But i want all the datasets data to be placed in single dataset as below with out using uninon keyword
(1,{(1,a,null),(1,a,null)})
(4,{(4,b,null),(4,b,6)})
(7,{(7,c,null),(7,c,9)})
(a,{(1,a,null),(1,a,3)})
(b,{(4,b,null),(4,b,6)})
(c,{(7,c,null),(7,c,9)})
(null,{(1,a,null),(4,b,null),(7,c,null)})
(3,{(1,a,3)})
(6,{(4,b,6)})
(7,{(7,c,9)})
Thanks in advance

Answer 1

Read the data as lines and do a word count.
Script
raw_data= LOAD 'test3.txt' AS (line:chararray);
words = FOREACH raw_data GENERATE FLATTEN(TOKENIZE(line)) as word;
grouped = GROUP words BY word;
wordcount = FOREACH grouped GENERATE group, COUNT(words);
DUMP wordcount;
Output