/// <summary>
/// Helper for VisitBinaryOperator. Builds the new case with distributed valueds.
/// </summary>
private SqlExpression DistributeOperatorIntoCase(SqlNodeType nt, SqlSimpleCase sc, SqlExpression expr)
{
if (nt != SqlNodeType.EQ && nt != SqlNodeType.NE && nt != SqlNodeType.EQ2V && nt != SqlNodeType.NE2V)
{
throw Error.ArgumentOutOfRange("nt");
}
object val = Eval(expr);
List <SqlExpression> values = new List <SqlExpression>();
List <SqlExpression> matches = new List <SqlExpression>();
foreach (SqlWhen when in sc.Whens)
{
matches.Add(when.Match);
object whenVal = Eval(when.Value);
bool eq = when.Value.SqlType.AreValuesEqual(whenVal, val);
values.Add(sql.ValueFromObject((nt == SqlNodeType.EQ || nt == SqlNodeType.EQ2V) == eq, false, sc.SourceExpression));
}
return(this.VisitExpression(sql.Case(typeof(bool), sc.Expression, matches, values, sc.SourceExpression)));
}