protected override object InternalExecute(Program program, PlanNode planNode)
{
if (planNode is BaseTableVarNode)
{
MemoryScan scan = new MemoryScan(program, this, (BaseTableVarNode)planNode);
try
{
scan.NativeTable = EnsureNativeTable(((BaseTableVarNode)planNode).TableVar);
scan.Key = scan.NativeTable.ClusteredIndex.Key;
scan.Open();
return(scan);
}
catch
{
scan.Dispose();
throw;
}
}
else if (planNode is OrderNode)
{
MemoryScan scan = new MemoryScan(program, this, (BaseTableVarNode)planNode.Nodes[0]);
try
{
scan.NativeTable = EnsureNativeTable(((BaseTableVarNode)planNode.Nodes[0]).TableVar);
scan.Key = ((OrderNode)planNode).PhysicalOrder;
scan.Direction = ((OrderNode)planNode).ScanDirection;
scan.Node.Order = ((OrderNode)planNode).Order;
scan.Open();
return(scan);
}
catch
{
scan.Dispose();
throw;
}
}
else if (planNode is CreateTableVarBaseNode)
{
EnsureNativeTable(((CreateTableVarBaseNode)planNode).GetTableVar());
return(null);
}
else if (planNode is AlterTableNode)
{
// TODO: Memory device alter table support
return(null);
}
else if (planNode is DropTableNode)
{
Schema.TableVar tableVar = ((DropTableNode)planNode).Table;
NativeTables tables = GetTables(tableVar.Scope);
lock (tables)
{
int tableIndex = tables.IndexOf(tableVar);
if (tableIndex >= 0)
{
NativeTable nativeTable = tables[tableIndex];
#if USEMEMORYDEVICETRANSACTIONS
RemoveTransactionReferences(nativeTable.TableVar);
#endif
nativeTable.Drop(program.ValueManager);
tables.RemoveAt(tableIndex);
}
}
return(null);
}
else
{
throw new DeviceException(DeviceException.Codes.InvalidExecuteRequest, Device.Name, planNode.ToString());
}
}
