When POUnion is one of the roots of a map plan, POUnion.getNext() gives a null
pointer exception
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Key: PIG-634
URL: https://issues.apache.org/jira/browse/PIG-634
Project: Pig
Issue Type: Bug
Affects Versions: types_branch
Reporter: Pradeep Kamath
Assignee: Pradeep Kamath
Fix For: types_branch
POUnion.getnext() gives a null pointer exception in the following scenario
(pasted from a code comment explaining the fix for this issue). If a script
results in a plan like the one below, currently POUnion.getNext() gives a null
pointer exception
{noformat}
// POUnion
// |
// |--POLocalRearrange
// | |
// | |-POUnion (root 2)--> This union's getNext() can lead
the code here
// |
// |--POLocalRearrange (root 1)
// The inner POUnion above is a root in the plan which has 2
roots.
// So these 2 roots would have input coming from different input
// sources (dfs files). So certain maps would be working on
input only
// meant for "root 1" above and some maps would work on input
// meant only for "root 2". In the former case, "root 2" would
// neither get input attached to it nor does it have
predecessors
{noformat}
A script which can cause a plan like above is:
{code}
a = load 'xyz';
b = load 'abc';
c = union a,b;
d = load 'def';
e = cogroup c by $0 inner , d by $0 inner;
dump e;
{code}
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