Add cross as a nested_op
------------------------
Key: PIG-1665
URL: https://issues.apache.org/jira/browse/PIG-1665
Project: Pig
Issue Type: New Feature
Components: grunt
Affects Versions: 0.7.0
Reporter: hc busy
It would be good to be able to cross inside a foreach:
\\
{code}
A = load 'data' as (ind:int, ind2:int, ind3:int, value:int);
B = group A by ind;
C = foreach B {
c = cross A.(ind2, value), A.(ind3, value);
generate group as ind, FLATTEN(c) as (ind2, value1, ind3, value2);
}
{code}
This reassures me that the cross is happening only within the group of ind1 and
not generating a full (ind1, ind2, ind3) cross, and then limiting to just one
ind1.
In the words of the manual [Pig Latin Reference Manual 2,
ver0.7|http://hadoop.apache.org/pig/docs/r0.7.0/piglatin_ref2.html#FOREACH]
this ticket asks for "cross" to be added as a "nested_op". Consider also the
following example:
{code}
A = load 'data' as (ind:int, ind2:int, ind3:int, ind4:int, value:int);
B = group A by ind;
C = foreach B {
c1 = cross A.(ind2, value), A.(ind3, value);
c2 = cross A.(ind2, value), A.(ind4, value);
generate group as ind, FLATTEN(c1) as (ind2, value1, ind3, value2),
FLATTEN(c2) as (ind4, value1, ind5, value2);
}
{code}
which you would not be able to accomplish without a cross nested_op.
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