Module stats

Traits and utilities to compute and access array statistics.

Modules

flatbuffers

Structs

ArrayStats

A shared StatsSet stored in an array. Can be shared by copies of the array and can also be mutated in place.

IsConstant

IsSorted

IsStrictSorted

LowerBound

Interpret the value as a lower bound. These form a partial order over successively more precise bounds

Max

These structs allow the extraction of the bound from the Precision value. They tie together the Stat and the StatBound, which allows the bound to be extracted.

Min

NullCount

StatsSet

StatsSetIntoIter

Owned iterator over the stats.

StatsSetRef

Reference to an array’s StatsSet. Can be used to get and mutate the underlying stats.

Sum

UncompressedSizeInBytes

UpperBound

Interpret the value as an upper bound, see LowerBound for more details.

Enums

Precision

A statistic has a precision Exact or Inexact. This represents uncertainty in that value. Exact values are computed, where can inexact values are likely inferred from compute functions.

Stat

Constants

PRUNING_STATS

Statistics that are used for pruning files (i.e., we want to ensure they are computed when compressing/writing). Sum is included for boolean arrays.

STATS_TO_WRITE

Stats to keep when serializing arrays to layouts

Traits

StatBound

StatBound defines the operations that can be performed on a bound. The main bounds are Upper (e.g. max) and Lower (e.g. min).

StatType

StatType define the bound of a given statistic. (e.g. Max is an upper bound), this is used to extract the bound from a Precision value, (e.g. p::bound<Max>()).

StatsProvider

StatsProviderExt

Functions

as_stat_bitset_bytes

stats_from_bitset_bytes