A configurable limit on the number of unique values should be set on the
UniqueValueCount and ValueHistogram aggregators
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Key: HADOOP-1342
URL: https://issues.apache.org/jira/browse/HADOOP-1342
Project: Hadoop
Issue Type: Improvement
Reporter: Runping Qi
In the current implementation, the uniq number of values may increase
unbounded, causing out of memory eventually.
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