ArrowStringDataFrameColumn.GroupColumnValues<TKey> Method

Reference

Definition

Namespace:: Microsoft.Data.Analysis

Assembly:: Microsoft.Data.Analysis.dll

Package:: Microsoft.Data.Analysis v0.21.1

Important

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Groups the rows of this column by their value.

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

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

Public Overrides 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