public void GetMetadata <TValue>(string kind, int col, ref TValue value)
{
_env.Check(0 <= col && col < ColumnCount);
var inputCol = _shape[col];
var metaShape = inputCol.Metadata;
if (metaShape == null || !metaShape.TryFindColumn(kind, out var metaColumn))
{
throw _env.ExceptGetMetadata();
}
var colType = MakeColumnType(metaColumn);
_env.Check(colType.RawType.Equals(typeof(TValue)));
if (colType.IsVector)
{
// This as an atypical use of VBuffer: we create it in GetMetadataVec, and then pass through
// via boxing to be returned out of this method. This is intentional.
value = (TValue)Utils.MarshalInvoke(GetMetadataVec <int>, colType.ItemType.RawType);
}
else
{
value = default;
}
}