public RawTableInfo Union(RawTableInfo info)
{
// Number of Table 'columns'
int colCount = tableItems.Count;
var merge1 = SortItems();
var merge2 = info.SortItems();
long size1 = -1;
long size2 = -1;
// First check number of tables in each merge is correct.
if (merge1.Length != merge2.Length)
{
throw new InvalidOperationException("Incorrect format in table union");
}
// Check each table in the merge1 set has identical length row_sets
for (long i = 0; i < merge1.Length; ++i)
{
if (size1 == -1)
{
size1 = merge1[i].Rows.Count;
}
else
{
if (size1 != merge1[i].Rows.Count)
{
throw new InvalidOperationException("Incorrect format in table union");
}
}
}
// Check each table in the merge2 set has identical length row_sets
for (long i = 0; i < merge2.Length; ++i)
{
// Check the tables in merge2 are identical to the tables in merge1
if (!merge2[i].Table.Equals(merge1[i].Table))
{
throw new InvalidOperationException("Incorrect format in table union");
}
if (size2 == -1)
{
size2 = merge2[i].Rows.Count;
}
else
{
if (size2 != merge2[i].Rows.Count)
{
throw new InvalidOperationException("Incorrect format in table union");
}
}
}
// If size1 or size2 are -1 then we have a corrupt table. (It will be
// 0 for an empty table).
if (size1 == -1 || size2 == -1)
{
throw new InvalidOperationException("Incorrect format in table union");
}
// We don't need information in 'raw_info' vector anymore so clear it.
// This may help garbage collection.
var resultItems = new List <RawTableItem>();
// Merge the two together into a new list of RawRowElement[]
var mergeSize = size1 + size2;
var elems = new BigArray <RawRowItem>(mergeSize);
int elemsIndex = 0;
for (long i = 0; i < size1; ++i)
{
var itemRows = new BigArray <long>(colCount);
for (int n = 0; n < colCount; ++n)
{
itemRows[n] = merge1[n].Rows[i];
}
elems[elemsIndex] = new RawRowItem(itemRows);
++elemsIndex;
}
for (long i = 0; i < size2; ++i)
{
var itemRows = new BigArray <long>(colCount);
for (int n = 0; n < colCount; ++n)
{
itemRows[n] = merge2[n].Rows[i];
}
elems[elemsIndex] = new RawRowItem(itemRows);
++elemsIndex;
}
// Now sort the row elements into order.
BigArray <RawRowItem> .QuickSort(elems);
// Remove any duplicate rows.
for (int i = 0; i < colCount; ++i)
{
merge1[i].Rows.Clear();
}
RawRowItem previous = null;
for (int n = 0; n < mergeSize; ++n)
{
var current = elems[n];
// Check that the current element in the set is not a duplicate of the
// previous.
if (previous == null || previous.CompareTo(current) != 0)
{
for (int i = 0; i < colCount; ++i)
{
merge1[i].Rows.Add(current.RowValues[i]);
}
previous = current;
}
}
for (int i = 0; i < colCount; ++i)
{
resultItems.Add(merge1[i]);
}
return(new RawTableInfo(resultItems.ToArray()));
}