Logical Optimizer: Merge cascading foreach
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Key: PIG-1321
URL: https://issues.apache.org/jira/browse/PIG-1321
Project: Pig
Issue Type: New Feature
Components: impl
Affects Versions: 0.7.0
Reporter: Daniel Dai
Assignee: Daniel Dai
We can merge consecutive foreach statement.
Eg:
b = foreach a generate a0#'key1' as b0, a0#'key2' as b1, a1;
c = foreach b generate b0#'kk1', b0#'kk2', b1, a1;
=> c = foreach a generate a0#'key1'#'kk1', a0#'key1'#'kk2', a0#'key2', a1;
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