Enable merge join in pig to work with loaders which can internally index sorted
data
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Key: PIG-953
URL: https://issues.apache.org/jira/browse/PIG-953
Project: Pig
Issue Type: Improvement
Affects Versions: 0.3.0
Reporter: Pradeep Kamath
Assignee: Pradeep Kamath
Currently merge join implementation in pig includes construction of an index on
sorted data and use of that index to seek into the "right input" to efficiently
perform the join operation. Some loaders (notably the zebra loader) internally
implement an index on sorted data and can perform this seek efficiently using
their index. So the use of the index needs to be abstracted in such a way that
when the loader supports indexing, pig uses it (indirectly through the loader)
and does not construct an index.
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