ZeroOpNode.cs

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using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
 
namespace System.Data;
 
internal sealed class ZeroOpNode : ExpressionNode
{
    internal readonly int _op;
 
    internal ZeroOpNode(int op)
        : base(null)
    {
        _op = op;
    }
 
    internal override void Bind(DataTable table, List<DataColumn> list)
    {
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    internal override object Eval()
    {
        return _op switch
        {
            33 => true, 
            34 => false, 
            32 => DBNull.Value, 
            _ => DBNull.Value, 
        };
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    internal override object Eval(DataRow row, DataRowVersion version)
    {
        return Eval();
    }
 
    [RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
    internal override object Eval(int[] recordNos)
    {
        return Eval();
    }
 
    internal override bool IsConstant()
    {
        return true;
    }
 
    internal override bool IsTableConstant()
    {
        return true;
    }
 
    internal override bool HasLocalAggregate()
    {
        return false;
    }
 
    internal override bool HasRemoteAggregate()
    {
        return false;
    }
 
    internal override ExpressionNode Optimize()
    {
        return this;
    }
}