PERFORMANCE: Vectorize operators
Issue Type: Improvement
Reporter: Thejas M Nair
By Vectorization, I mean passing multiple (/vector of) records at a time
between operators (and potentially other functions like udfs)
Vectorization of pig operators can improve performance by
1. improving locality and cache utilization
2. Reducing number of function calls. Many functions calls are likely to be
dynamically resolved. There may be some checks in each function that we might
be able to do once for several recs.
3. Potentially benefit from cpu pipeline architecture. ( But I don't know how
good java VM is at that ..)
To do vectorization in map stage, we need to use MapRunner - see PIG-687.
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