DataFrameColumn.GroupColumnValues<TKey>(HashSet<Int64>) Method

Reference

Definition

Namespace:: Microsoft.Data.Analysis

Assembly:: Microsoft.Data.Analysis.dll

Package:: Microsoft.Data.Analysis v0.21.1

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Groups the rows of this column by their value.

public virtual System.Collections.Generic.Dictionary<TKey,System.Collections.Generic.ICollection<long>> GroupColumnValues<TKey> (out System.Collections.Generic.HashSet<long> nullIndices);

abstract member GroupColumnValues : HashSet -> System.Collections.Generic.Dictionary<'Key, System.Collections.Generic.ICollection<int64>>
override this.GroupColumnValues : HashSet -> System.Collections.Generic.Dictionary<'Key, System.Collections.Generic.ICollection<int64>>

Public Overridable Function GroupColumnValues(Of TKey) (ByRef nullIndices As HashSet(Of Long)) As Dictionary(Of TKey, ICollection(Of Long))

Type Parameters

TKey

The type of data held by this column

Parameters

nullIndices: HashSet<Int64>

Returns

Dictionary<TKey,ICollection<Int64>>

A mapping of value(TKey) to the indices containing this value. Should be sorted collection.

Applies to

Share via