public SqlExpression BuildProjection(SqlExpression item, MetaType rowType, bool allowDeferred, SqlLink link, Expression source)
{
if (!rowType.HasInheritance)
{
return(BuildProjectionInternal(item, rowType, (rowType.Table != null) ? rowType.PersistentDataMembers : rowType.DataMembers, allowDeferred, link, source));
}
var list = new List <MetaType>(rowType.InheritanceTypes);
var list2 = new List <SqlTypeCaseWhen>();
SqlTypeCaseWhen when = null;
MetaType inheritanceRoot = rowType.InheritanceRoot;
MetaDataMember discriminator = inheritanceRoot.Discriminator;
Type type = discriminator.Type;
SqlMember member2 = sql.Member(item, discriminator.Member);
foreach (MetaType type3 in list)
{
if (type3.HasInheritanceCode)
{
SqlNew typeBinding = BuildProjectionInternal(item, type3, type3.PersistentDataMembers, allowDeferred, link, source);
if (type3.IsInheritanceDefault)
{
when = new SqlTypeCaseWhen(null, typeBinding);
}
object obj2 = InheritanceRules.InheritanceCodeForClientCompare(type3.InheritanceCode, member2.SqlType);
SqlExpression match = sql.Value(type, sql.Default(discriminator), obj2, true, source);
list2.Add(new SqlTypeCaseWhen(match, typeBinding));
}
}
if (when == null)
{
throw Error.EmptyCaseNotSupported();
}
list2.Add(when);
return(sql.TypeCase(inheritanceRoot.Type, inheritanceRoot, member2, list2.ToArray(), source));
}
private static bool IsSupportedMember(SqlMember m)
{
if (!IsNullableHasValue(m))
{
return(IsNullableHasValue(m));
}
return(true);
}
protected override SqlNode VisitMember(SqlMember m)
{
m.Expression = this.VisitExpression(m.Expression);
if (IsNullableValue(m))
{
return(sql.UnaryValueOf(m.Expression, m.SourceExpression));
}
if (IsNullableHasValue(m))
{
return(sql.Unary(SqlNodeType.IsNotNull, m.Expression, m.SourceExpression));
}
return(m);
}
protected virtual SqlNode VisitMember(SqlMember m)
{
m.Expression = this.VisitExpression(m.Expression);
return(m);
}
protected override SqlNode VisitMember(SqlMember m)
{
return(new SqlMember(m.ClrType, m.SqlType, (SqlExpression)this.Visit(m.Expression), m.Member));
}
private static bool IsNullableValue(SqlMember m)
{
return(TypeSystem.IsNullableType(m.Expression.ClrType) && (m.Member.Name == "Value"));
}