Viraj Bhat commented on PIG-1060:

Hi Ankur and Richard,
 I have a script which demonstrates a similar problem, but can be solved by 
using the -M option. This script can reproduce the problem even without the 
UNION operator , but it has  properties 1 and 2 of the original problem 

Try commenting out the F alias. It works fine.


ORGINALDATA = load '/user/viraj/somedata.txt' using PigStorage() as (col1, 
col2, col3, col4, col5, col6, col7, col8);

--Check data

A = foreach ORGINALDATA generate col1, col2, col3, col4, col5, col6;

B = group A all;

C = foreach B generate COUNT(A);

store C into '/user/viraj/result1';

D = filter A by (col1 == col2) or (col1 == col3);

E = group D all;

F = foreach E generate COUNT(D);

--try commenting F
store F into '/user/viraj/result2';

G = filter D by (col4 == col5) ;

H = group G all;

I = foreach H generate COUNT(G);

store I into '/user/viraj/result3';

J = filter G by (((col6 == 'm') or (col6 == 'M')) and (col6 == 1)) or (((col6 
== 'f') or (col6 == 'F')) and (col6 == 0)) or ((col6 == '') and (col6 == -1));

K = group J all;

L = foreach K generate COUNT(J);

store L into '/user/viraj/result4';


> MultiQuery optimization throws error for multi-level splits
> -----------------------------------------------------------
>                 Key: PIG-1060
>                 URL: https://issues.apache.org/jira/browse/PIG-1060
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.5.0
>            Reporter: Ankur
>            Assignee: Richard Ding
> Consider the following scenario :-
> 1. Multi-level splits in the map plan.
> 2. Each split branch further progressing across a local-global rearrange.
> 3. Output of each of these finally merged via a UNION.
> MultiQuery optimizer throws the following error in such a case:
> "ERROR 2146: Internal Error. Inconsistency in key index found during 
> optimization."

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