Brian Hulette created ARROW-2144:

             Summary: [JS] Don't repeat dictionary lookups in DataFrame ops
                 Key: ARROW-2144
             Project: Apache Arrow
          Issue Type: Improvement
          Components: JavaScript
            Reporter: Brian Hulette

Currently we repeat dictionary lookups every time we bind a new record batch 
when doing an equality check in a DataFrame op 

In most cases the dictionary won't be changing between record batches, so we 
should remember these reverse dictionary lookups, either permanently, or at 
least for the duration of the current operation.

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