Not entirely following you on the Order UDF.. doesn one exist or are you
proposing I create this myself?
Thanks.
On 5/11/12 10:49 AM, Jonathan Coveney wrote:
The nesting and the non-nested are indeed the same. To limit, you could do:
b = group a by (country, search_term);
c = foreach b generate flatten(group) as (country, search_term), COUNT(a)
as ct;
d = foreach (group c by country) generate ORDER_UDF(TOP(b, 2, 10)); --I
forget the order of commands, check documentation
the ORDER_UDF doesn't exist. It's important to remember that bags have no
order, so if you want a TUPLE in term order, you need to take in a bag, and
then get the elements, sort them, and put them in a Tuple. If you need help
with that, less us know.
2012/5/11 Mark<[email protected]>
Also, using your example, how could I limit the number of terms per
country?
On 5/11/12 9:47 AM, Mark wrote:
Thank you so much, that's pretty much what I was going for but with a
slightly different output.
Just to be clear... are these equivalent?
b = foreach (group a by (country, search_term)) generate flatten(group) as
(country, search_term), COUNT(a) as ct;
b = group a by (country, search_term);
c = foreach b generate flatten(group) as (country, search_term), COUNT(a)
as ct;
I'm guessing so... I didn't know you could combine/nest these statements.
After experimenting with your example I'm pretty sure I understand
everything that's going on. I can work with this format but I was wondering
how would I massage this into something like:
(country1, top term1, topterm2, topterm3, ...)
(country2, top term1, topterm2, topterm3, ...)
(country3, top term1, topterm2, topterm3, ...)
Maybe it has to be something like this:
(country1, (top term1, topterm2, topterm3, ...))
So one row per country with the first value being the country and the
following values the top terms in order? Is this even possible with Pig?
Thanks for the clarification.
On 5/10/12 5:32 PM, Jonathan Coveney wrote:
a = load 'log' as (country:chararray, search_term:chararray);
b = foreach (group a by (country, search_term)) generate flatten(group)
as
(country, search_term), COUNT(a) as ct;
c = order b by country asc, ct desc;
It sort of depends what format you want the output in, though. Note: if
you
know that the number of search terms is low you could do this in memory
and
do it in one m/r job, but this version will be scalable.
If this solution doesn't make sense, I can help explain it. It's
important
to know what format you want the output in. This would give you every
country (in ascending alphabetical order), and then the search term and
count starting with the highest.
2012/5/10 Mark<[email protected]**>
We have logs in the following format
us, foo
us, foo
fr, fizz
us, bar
fr, baz
fr, fizz
us, foo
fr, fizz
Where the first column is a country and the second column is a search
term.
How in the world can I output the country followed by the top terms in
order of occurrence... ie:
us, (foo, bar) # Top term for 'us' is foo then bar then ...
fr, (fizz, baz) # Top term for 'fr' is fizz then baz then ...
Thanks
