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From "Dmitriy V. Ryaboy (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-2420) FLATTEN of null tuples produces unexpected number of fields
Date Sat, 10 Dec 2011 01:02:39 GMT
FLATTEN of null tuples produces unexpected number of fields
-----------------------------------------------------------

                 Key: PIG-2420
                 URL: https://issues.apache.org/jira/browse/PIG-2420
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.9.0, 0.8.1, 0.8.0, 0.9.1, 0.10, 0.9.2
            Reporter: Dmitriy V. Ryaboy


Flattening a null tuple results in a single column (with the value null) being produced.

That leads to all the columns after the flattened value shifting left by n-1 positions, where
n is the number of expected fields in a tuple!

Consider:

grunt> sh cat tmp/x
foo	 bar
a	(b,c)	d
grunt> x = load 'tmp/x' as (a:chararray, b:(b:chararray, c:chararray), d:chararray);
grunt> projected = foreach x generate d;
grunt> dump projected   
(bar)
(d)

grunt> flattened = foreach x generate a, flatten(b) as (b, c), d;
grunt> dump flattened
(foo,,bar)  -- NOTE THREE FIELDS INSTEAD OF EXPECTED 4
(a,b,c,d)                           
grunt> projected = foreach flattened generate d;    
grunt> dump projected   
()  -- NOTE WRONG VALUE 
(d)
grunt> projected = foreach flattened generate c;
() -- NOTE THAT, INCONSISTENTLY, C is NULL! AS IS B.
(c)


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