Skewed join generates incorrect results
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Key: PIG-955
URL: https://issues.apache.org/jira/browse/PIG-955
Project: Pig
Issue Type: Improvement
Reporter: Ying He
Fragmented replicated join has a few limitations:
- One of the tables needs to be loaded into memory
- Join is limited to two tables
Skewed join partitions the table and joins the records in the reduce phase. It
computes a histogram of the key space to account for skewing in the input
records. Further, it adjusts the number of reducers depending on the key
distribution.
We need to implement the skewed join in pig.
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