SPARK-6480 [CORE] histogram() bucket function is wrong in some simple edge cases#5148

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srowen:SPARK-6480

Commits on Mar 23, 2015

Fix fastBucketFunction for histogram() to handle edge conditions more correctly. Add a test, and fix existing one accordingly
srowen
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Commits on Mar 26, 2015

Additional test of huge ranges, and a few more comments (and comment fixes)
srowen
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