bool IEquatable <ISqlExpression> .Equals(ISqlExpression other)
{
if (this == other)
{
return(true);
}
var expr = other as SqlBinaryExpression;
return
(expr != null &&
_operation == expr._operation &&
_systemType == expr._systemType &&
_expr1.Equals(expr._expr1) &&
_expr2.Equals(expr._expr2));
}