Grokbase Groups Pig user August 2010
Something strange is happening with your data. Can you provide an example?

I just tried this, with both Pig 6 and Pig 8 (trunk):

grunt> strings = load 'tmp/strings.txt' as (a:chararray, b:chararray);
grunt> dump strings;
grunt> x = filter strings by a == b;
grunt> dump x;
grunt> x = filter strings by a != b;
grunt> dump x

On Wed, Aug 18, 2010 at 4:22 PM, Dave Wellman wrote:

Because I wasn't able to find one I tossed this UDF into the mix.

public class StrComp extends EvalFunc<Integer> {

public Integer exec(Tuple arg0) throws IOException {
// should have 2 tuples.
if (arg0.size() != 2) {
throw new IOException("Dude where's my tuples?");


And the pig calls:

x = FILTER y BY StrComp(a, b) == 0;


x = FILTER y BY StrComp(a, b) != 0;

The tuples a and b are chararray. My solution "works" but a nice standard
piggy bank udfs would be better.

On Aug 18, 2010, at 4:56 PM, Dmitriy Ryaboy wrote:

Can you provide some sample data? A tuple can't be a chararray (but it can
contain one), so I want to make sure I understand what the data you are
working with looks like.

On Wed, Aug 18, 2010 at 3:29 PM, Dave Wellman wrote:


I have what should be a simple problem. I have 2 tuples that are
chararrays t1, t2 and want to do a comparision. using

x = FILTER y BY (t1 == t2);

results in zero (0) records.

x = FILTER y BY (t1 != t2);

is zero records. And

x = FILTER y BY (t1 matches t2);

is an error. Ideal would be a StrComp(t1, t2) filter func.

Is there a UDF for that?


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categoriespig, hadoop
postedAug 18, '10 at 10:38p
activeAug 20, '10 at 12:49a

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Dave Wellman: 2 posts Dmitriy Ryaboy: 2 posts



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