EquiDepthHistogram creates a histogram where each bucket contains roughly the same number of samples (though it can vary when a boundary value has high frequency).

NewTableStatisticsCache creates a new TableStatisticsCache, with the size of the underlying statsCache set to statsCacheSize, and the size of the underlying histogramCache set to histogramCacheSize.

HistogramCacheKey is used as the key type for entries in the TableStatisticsCache which contain a histogram.

HistogramData encodes the data for a histogram, which captures the distribution of values on a specific column.

JSONHistoBucket is a struct used for JSON marshaling and unmarshaling of histogram data.

JSONStatistic is a struct used for JSON marshaling and unmarshaling statistics.

SampledRow is a row that was sampled.

SampleReservoir implements reservoir sampling using random sort.

A TableStatistic object holds a statistic for a particular column or group of columns.

A TableStatisticsCache contains two underlying LRU caches: (1) A cache of []*TableStatistic objects, keyed by table ID.