Pig Script - Min, Avg, Max - apache-pig

Question

Let us say I have these in a file ...
1
2
3
Using a Pig Script, how can I get this (number, minimum, mean, maximum in each line) ?
1,1,2,3
2,1,2,3
3,1,2,3
Please let me know the Pig Script. I am able to get the MIN, AVG, MAX using Pig built in functions, but am not able to get them all in each line.
Thanks
Naga

Answer 1

Use the TOBAG built-in UDF to get your fields into a bag, and then you can use the MIN, AVG, and MAX functions on that bag. You should have no trouble using all three summary functions on a single record.

Answer 2

Here is my simple solution for the problem.
I had the following numbers as input,
temp2.txt
1
2
3
4
5
.
.
16
17
18
19
20
I followed these steps,
1]loaded the data from the file
2]Then grouped all the data
3]Found Average,Minimum,Maximum from the grouped data
4]Then foreach value in loaded data generated data and the minimum , maximum and average values.
The code is as follows,
grunt> data = load '/home/temp2.txt' as (val);
grunt> g = group data all;
grunt> avg = foreach g generate AVG(data.val) as a;
grunt> min = foreach g generate MIN(data.val) as m;
grunt> max = foreach g generate MAX(data.val) as x;
grunt> values = foreach data generate val,min.m,max.x,avg.a;
grunt> dump values;
The following is the output,
Output
(1,1.0,20.0,10.5)
(2,1.0,20.0,10.5)
(3,1.0,20.0,10.5)
(4,1.0,20.0,10.5)
(5,1.0,20.0,10.5)
(6,1.0,20.0,10.5)
(7,1.0,20.0,10.5)
(8,1.0,20.0,10.5)
(9,1.0,20.0,10.5)
(10,1.0,20.0,10.5)
(11,1.0,20.0,10.5)
(12,1.0,20.0,10.5)
(13,1.0,20.0,10.5)
(14,1.0,20.0,10.5)
(15,1.0,20.0,10.5)
(16,1.0,20.0,10.5)
(17,1.0,20.0,10.5)
(18,1.0,20.0,10.5)
(19,1.0,20.0,10.5)
(20,1.0,20.0,10.5)