Redesign graph operations in OperatorPlan
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Key: PIG-827
URL: https://issues.apache.org/jira/browse/PIG-827
Project: Pig
Issue Type: Improvement
Components: impl
Affects Versions: 0.2.1
Reporter: Santhosh Srinivasan
Fix For: 0.2.1
The graph operations swap, insertBetween, pushBefore, etc. have to be
re-implemented in a layered fashion. The layering will facilitate the re-use of
operations. In addition, use of operator.rewire in the aforementioned
operations requires transaction like ability due to various pre-conditions.
Often, the result of one of the operations leaves the graph in an inconsistent
state for the rewire operation. Clear layering and assignment of the ability to
rewire will remove these inconsistencies. For now, use of rewire has resulted
in a slightly less maintainable code along with the necessity to use rewire
with discretion.
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