Module stats 

This module provides data structures to represent statistics

Structs

ColumnStatistics

Statistics for a column within a relation

Statistics

Statistics for a relation Fields are optional and can be inexact because the sources sometimes provide approximate estimates for performance reasons and the transformations output are not always predictable.

Enums

NdvFallback

Fallback to use when NDV overlap can not be estimated from column bounds.

Precision

Represents a value with a degree of certainty. Precision is used to propagate information the precision of statistical values.

Functions

estimate_ndv_with_overlap

Estimates the combined number of distinct values (NDV) when merging two column statistics, using range overlap to avoid double-counting shared values.