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  1. Apache Arrow
  2. ARROW-4147

[JAVA] Reduce heap usage for variable width vectors

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      This is a follow up to ARROW-1807. The same changes need to be done for variable len vectors too.

      Also, the default value for initial allocations (4096) causes a lot of wastage, and needs to be changed (to 3970).

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              pravindra Pindikura Ravindra
              pravindra Pindikura Ravindra
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