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Pig >> mail # user >> newbie just not getting structure


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newbie just not getting structure
I'm having problems with understanding storage structures. Here's what I
did:

on the cluster I loaded some data and created a relation with one row.
I output the row using store relation into '/file' using PigStorage('|');
then I copied it my local workspace, copyToLocal /file ./file
then I tarred up the local file and scp'd it to my laptop.

on my laptop I untarred the file into data/file
then I ran these pig commands:

b = load 'data/file' using PigStorage('|') as (a:map[]); --because I'm
expecting a map
dump b;

return is successful but result is ().

then I ran
c = foreach b generate *;
dump c;

return is successful but result is ().

then I tried

d = load 'data/file' using PigStorage('|');
dump d;

return
is ([id#ID1,documentDate#1344461328851,source#93931,indexed#false,lastModifiedDate#1344461328851,contexts#{([id#CID1])}])

since that is a map, I'm not sure why dump b didn't return values. so then
I tried
e = foreach d generate $0#'id';
dump e;

and the return was ();

Does anyone see where I'm missing the point? And how do I grab those map
values?

Thanks
+
Cheolsoo Park 2012-08-15, 23:06
+
Lauren Blau 2012-08-16, 09:48
+
Lauren Blau 2012-08-21, 12:14