class DataFrameStatFunctions extends AnyRef
Stat functions for dataframe
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def
batchCreateBloomFilter(columnNames: Seq[String], expectedNumItems: Long, fpp: Double): Seq[BloomFilter]
Batch creating multiple bloomFilters, one for each column.
Batch creating multiple bloomFilters, one for each column. This is more efficient than using Spark implementation, as this only requires reading input dataset once, while the Spark implementation will read input dataset once per bloomfilter
- columnNames
column names to create bloomfilters on, e.g when creating bloomfilter for multiple join key combinations such as <x>, <y>, <x, y>
- expectedNumItems
expected number of distinct item in the dataframe regarding the join key
- fpp
false positive rate
- returns
sequence of created bloomfilters
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