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Comment: Update hive.stats.ndv.error definition to tell it only affects the FM-Sketch

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Standard error allowed for NDV estimates, expressed in percentage. This provides a tradeoff between accuracy and compute cost. A lower value for the error indicates higher accuracy and a higher compute cost. (NDV means number of distinct values.) 

It only affects the FM-Sketch (not the HLL algorithm which is the default), where it computes the number of necessary bitvectors to achieve the accuracy.

hive.stats.collect.tablekeys

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