private UngroupTransform(IHost host, ModelLoadContext ctx, IDataView input)
: base(host, input)
{
Host.AssertValue(ctx);
// *** Binary format ***
// (binding)
_ungroupBinding = UngroupBinding.Create(ctx, host, input.Schema);
}
public UngroupTransform(IHostEnvironment env, Arguments args, IDataView input)
: base(env, LoaderSignature, input)
{
Host.CheckValue(args, nameof(args));
Host.CheckUserArg(Utils.Size(args.Column) > 0, nameof(args.Column), "There must be at least one pivot column");
Host.CheckUserArg(args.Column.Distinct().Count() == args.Column.Length, nameof(args.Column),
"Duplicate pivot columns are not allowed");
_ungroupBinding = new UngroupBinding(Host, Source.Schema, args.Mode, args.Column);
}
public Cursor(IChannelProvider provider, RowCursor input, UngroupBinding schema, Func <int, bool> predicate)
: base(provider, input)
{
_ungroupBinding = schema;
_active = Utils.BuildArray(_ungroupBinding.InputColumnCount, predicate);
_cachedGetters = new Delegate[_ungroupBinding.InputColumnCount];
_colSizes = new int[_ungroupBinding.InputColumnCount];
int sizeColumnsLim = _ungroupBinding.Mode == UngroupMode.First ? 1 : _ungroupBinding.PivotColumnCount;
_fixedSize = 0;
var needed = new List <Func <int> >();
for (int i = 0; i < sizeColumnsLim; i++)
{
var info = _ungroupBinding.GetPivotColumnInfo(i);
if (info.Size > 0)
{
if (_fixedSize == 0)
{
_fixedSize = info.Size;
}
else if (_ungroupBinding.Mode == UngroupMode.Inner && _fixedSize > info.Size)
{
_fixedSize = info.Size;
}
else if (_ungroupBinding.Mode == UngroupMode.Outer && _fixedSize < info.Size)
{
_fixedSize = info.Size;
}
}
else
{
// This will also create and cache a getter for the pivot column.
// That's why MakeSizeGetter is an instance method.
var rawItemType = info.ItemType.RawType;
Func <int, Func <int> > del = MakeSizeGetter <int>;
var mi = del.GetMethodInfo().GetGenericMethodDefinition().MakeGenericMethod(rawItemType);
var sizeGetter = (Func <int>)mi.Invoke(this, new object[] { info.Index });
needed.Add(sizeGetter);
}
}
_sizeGetters = needed.ToArray();
Ch.Assert(_fixedSize > 0 || _sizeGetters.Length > 0);
}
