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Pig >> mail # user >> BinCond


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soniya B 2013-04-27, 14:53
Hello Soniya,

       It's like the ternary or the conditional operator available in java
and works just like that. Here is the example provided in the reference
manual :

*Suppose we have relation A.*

A = LOAD 'data' AS (f1:int, f2:int, B:bag{T:tuple(t1:int,t2:int)});

DUMP A;
(10,1,{(2,3),(4,6)})
(10,3,{(2,3),(4,6)})
(10,6,{(2,3),(4,6),(5,7)})

*In this example the modulo operator is used with fields f1 and f2.*

X = FOREACH A GENERATE f1, f2, f1%f2;

DUMP X;
(10,1,0)
(10,3,1)
(10,6,4)

*In this example the bincond operator is used with fields f2 and B. The
condition is "f2 equals 1"; if the condition is true, return 1; if the
condition is false, return the count of the number of tuples in B.*

X = FOREACH A GENERATE f2, (f2==1?1:COUNT(B));

DUMP X;
(1,1L)
(3,2L)
(6,3L)
It clearly shows that when "f2==1", which is the first case the exp
evaluates to true, hence "1" is returned and count(B) is returned in rest
of the 2 cases as exp evaluates to false.

What were you trying to do and what exactly is the problem which you are
facing?

Warm Regards,
Tariq
https://mtariq.jux.com/
cloudfront.blogspot.com
On Sat, Apr 27, 2013 at 8:23 PM, soniya B <[EMAIL PROTECTED]> wrote:

> Hi,
>
> Anyone can explain me about use of BinCond function with an example?  I am
> trying a lot but didn't work it.
>
> Regards
> Soniya
>
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soniya B 2013-04-28, 02:12