public CursorType(InfiniteLoopViewCursorDataFrame view, Func <int, bool> needCol, IRowCursor otherValues)
{
_needCol = needCol;
_view = view;
_state = CursorState.NotStarted;
_otherValues = otherValues;
_wait = true;
_position = 0;
_batch = 1;
_container = null;
_positionDataFrame = -1;
_columnsSchema = _view._columnsSchema;
_columns = new Dictionary <int, int>();
for (int i = 0; i < view.ReplacedCol.Length; ++i)
{
_columns[view.ReplacedCol[i]] = i;
}
}
public CursorType(InfiniteLoopViewCursorDataFrame view, IEnumerable <DataViewSchema.Column> columnsNeeded,
DataViewRowCursor otherValues, int start, int inc)
{
_columnsNeeded = columnsNeeded;
_start = start;
_inc = inc;
_view = view;
_state = CursorState.NotStarted;
_otherValues = otherValues;
_wait = true;
_position = -1;
_batch = 1;
_container = null;
_positionDataFrame = -1;
_columnsSchema = _view._columnsSchema;
_columns = new Dictionary <int, int>();
for (int i = 0; i < view.ReplacedCol.Length; ++i)
{
_columns[view.ReplacedCol[i]] = i;
}
}
ValueMapper <DataFrame, DataFrame> GetMapperRow()
{
var firstView = _sourceToReplace ?? DataViewHelper.GetFirstView(_transform);
var schema = firstView.Schema;
var inputView = new InfiniteLoopViewCursorDataFrame(null, firstView.Schema);
// This is extremely time consuming as the transform is serialized and deserialized.
var outputView = _sourceToReplace == _transform.Source
? ApplyTransformUtils.ApplyTransformToData(_computeEnv, _transform, inputView)
: ApplyTransformUtils.ApplyAllTransformsToData(_computeEnv, _transform, inputView, _sourceToReplace);
// We assume all columns are needed, otherwise they should be removed.
using (var cur = outputView.GetRowCursor(i => true))
{
var getRowFiller = DataFrame.GetRowFiller(cur);
return((in DataFrame src, ref DataFrame dst) =>
{
if (dst is null)
{
dst = new DataFrame(outputView.Schema, src.Length);
}
else if (!dst.CheckSharedSchema(outputView.Schema))
{
throw _env.Except($"DataFrame does not share the same schema, expected {SchemaHelper.ToString(outputView.Schema)}.");
}
dst.Resize(src.Length);
inputView.Set(src);
for (int i = 0; i < src.Length; ++i)
{
cur.MoveNext();
getRowFiller(dst, i);
}
});
