Incremental operation
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Key: PIG-242
URL: https://issues.apache.org/jira/browse/PIG-242
Project: Pig
Issue Type: New Feature
Components: impl
Reporter: John DeTreville
Some Pig programs repeatedly perform operations on different versions of
tables, where these versions differ only slightly. For example, a program may
compute f(T) at one point and f(T + delta T) at a later point. In many such
cases, having already computed f(T) can allow us to speed up the computation of
f(T + delta T). For example, if f is a map operation, then f(T + delta T) is
f(T) + f(delta T), which can be computed relatively rapidly if delta T is small
and f(T) is already known.
It is already possible but often tedious for Pig programers to perform
incremental operations. It would possibly help if Pig provided syntax for
incremental operation.
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