Remove this method and let different instances of ColumnExpression exist

[smitpatel]

efcore/src/EFCore.Relational/Query/JsonQueryExpression.cs

Lines 189 to 199 in 0efc506

	/// <summary>
	/// Makes this JSON query expression nullable re-using existing nullable key properties
	/// </summary>
	/// <returns>A new expression which has <see cref="IsNullable" /> property set to true.</returns>
	[EntityFrameworkInternal]
	public virtual JsonQueryExpression MakeNullable(IReadOnlyDictionary<IProperty, ColumnExpression> nullableKeyPropertyMap)
	=> Update(
	JsonColumn.MakeNullable(),
	nullableKeyPropertyMap,
	JsonPath,
	nullable: true);