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

定义

按列的值对此列的行进行分组。

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))

类型参数

TKey

此列保留的数据类型

参数

nullIndices
HashSet<Int64>

返回

值 (TKey) 映射到包含此值的索引。 应对集合进行排序。

适用于