System.Data.Common.SqlBooleanStorage.Aggregate C# (CSharp) Метод

        public override object Aggregate(int[] records, AggregateType kind)
        {
            bool hasData = false;
            try
            {
                switch (kind)
                {
                    case AggregateType.Min:
                        SqlBoolean min = true;
                        for (int i = 0; i < records.Length; i++)
                        {
                            int record = records[i];
                            if (IsNull(record))
                                continue;
                            min = SqlBoolean.And(_values[record], min);
                            hasData = true;
                        }
                        if (hasData)
                        {
                            return min;
                        }
                        return _nullValue;

                    case AggregateType.Max:
                        SqlBoolean max = false;
                        for (int i = 0; i < records.Length; i++)
                        {
                            int record = records[i];
                            if (IsNull(record))
                                continue;
                            max = SqlBoolean.Or(_values[record], max);
                            hasData = true;
                        }
                        if (hasData)
                        {
                            return max;
                        }
                        return _nullValue;

                    case AggregateType.First:
                        if (records.Length > 0)
                        {
                            return _values[records[0]];
                        }
                        return _nullValue;

                    case AggregateType.Count:
                        int count = 0;
                        for (int i = 0; i < records.Length; i++)
                        {
                            if (!IsNull(records[i]))
                                count++;
                        }
                        return count;
                }
            }
            catch (OverflowException)
            {
                throw ExprException.Overflow(typeof(SqlBoolean));
            }
            throw ExceptionBuilder.AggregateException(kind, _dataType);
        }