<PackageReference Include="System.Reactive" Version="6.1.0" />

System.Reactive.Joins.QueryablePlan<TResult>

public class QueryablePlan<TResult>
Represents an execution plan for join patterns represented by an expression tree.
namespace System.Reactive.Joins { public class QueryablePlan<[System.Runtime.CompilerServices.Nullable(2)] TResult> { public Expression Expression { get; } } }