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  then the nulls will be dropped before the join.  Since all null keys go to a 
single reducer, if your key is null even a small percentage of the time the 
gain can be
- significant.  In one test where the key was null 7% of the time and the data 
was spread across 200 reducers, we saw a 6x speed up in the query by adding the 
early
+ significant.  In one test where the key was null 7% of the time and the data 
was spread across 200 reducers, we saw a about a 10x speed up in the query by 
adding the early
  filters.
  

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