public ValueGetter <TValue> GetGetter <TValue>(int col)
{
Ch.CheckParam(0 <= col && col < _bindings.ColumnCount, nameof(col));
Ch.CheckParam(IsColumnActive(col), nameof(col));
bool isSrc;
int index = _bindings.MapColumnIndex(out isSrc, col);
if (isSrc)
{
return(Input.GetGetter <TValue>(index));
}
Ch.Assert(index == 0);
Delegate idGetter = Input.GetIdGetter();
Ch.AssertValue(idGetter);
var fn = idGetter as ValueGetter <TValue>;
if (fn == null)
{
throw Ch.Except("Invalid TValue in GetGetter: '{0}'", typeof(TValue));
}
return(fn);
}
/// <summary>
/// Returns a value getter delegate to fetch the value of column with the given columnIndex, from the row.
/// This throws if the column is not active in this row, or if the type
/// <typeparamref name="TValue"/> differs from this column's type.
/// </summary>
/// <typeparam name="TValue"> is the column's content type.</typeparam>
/// <param name="column"> is the output column whose getter should be returned.</param>
public override ValueGetter <TValue> GetGetter <TValue>(DataViewSchema.Column column)
{
Ch.CheckParam(column.Index < _bindings.ColumnCount, nameof(column));
Ch.CheckParam(IsColumnActive(column), nameof(column.Index));
bool isSrc;
int index = _bindings.MapColumnIndex(out isSrc, column.Index);
if (isSrc)
{
return(Input.GetGetter <TValue>(Input.Schema[index]));
}
Ch.Assert(index == 0);
Delegate idGetter = Input.GetIdGetter();
Ch.AssertValue(idGetter);
var fn = idGetter as ValueGetter <TValue>;
if (fn == null)
{
throw Ch.Except($"Invalid TValue in GetGetter: '{typeof(TValue)}', " +
$"expected type: '{idGetter.GetType().GetGenericArguments().First()}'.");
}
return(fn);
}
public bool IsColumnActive(int col)
{
Ch.CheckParam(0 <= col && col < _colToActivesIndex.Length, nameof(col));
return(_colToActivesIndex[col] >= 0);
}
private Delegate CreateGetterDelegate(int col)
{
Ch.CheckParam(IsColumnActive(col), nameof(col));
var parquetType = _loader._columnsLoaded[col].DataType;
switch (parquetType)
{
case DataType.Boolean:
return(CreateGetterDelegateCore <bool, bool>(col, _parquetConversions.Conv));
case DataType.Byte:
return(CreateGetterDelegateCore <byte, byte>(col, _parquetConversions.Conv));
case DataType.SignedByte:
return(CreateGetterDelegateCore <sbyte?, sbyte>(col, _parquetConversions.Conv));
case DataType.UnsignedByte:
return(CreateGetterDelegateCore <byte, byte>(col, _parquetConversions.Conv));
case DataType.Short:
return(CreateGetterDelegateCore <short?, short>(col, _parquetConversions.Conv));
case DataType.UnsignedShort:
return(CreateGetterDelegateCore <ushort, ushort>(col, _parquetConversions.Conv));
case DataType.Int16:
return(CreateGetterDelegateCore <short?, short>(col, _parquetConversions.Conv));
case DataType.UnsignedInt16:
return(CreateGetterDelegateCore <ushort, ushort>(col, _parquetConversions.Conv));
case DataType.Int32:
return(CreateGetterDelegateCore <int?, int>(col, _parquetConversions.Conv));
case DataType.Int64:
return(CreateGetterDelegateCore <long?, long>(col, _parquetConversions.Conv));
case DataType.Int96:
return(CreateGetterDelegateCore <BigInteger, UInt128>(col, _parquetConversions.Conv));
case DataType.ByteArray:
return(CreateGetterDelegateCore <byte[], VBuffer <Byte> >(col, _parquetConversions.Conv));
case DataType.String:
return(CreateGetterDelegateCore <string, ReadOnlyMemory <char> >(col, _parquetConversions.Conv));
case DataType.Float:
return(CreateGetterDelegateCore <float?, Single>(col, _parquetConversions.Conv));
case DataType.Double:
return(CreateGetterDelegateCore <double?, Double>(col, _parquetConversions.Conv));
case DataType.Decimal:
return(CreateGetterDelegateCore <decimal?, Double>(col, _parquetConversions.Conv));
case DataType.DateTimeOffset:
return(CreateGetterDelegateCore <DateTimeOffset, DateTimeOffset>(col, _parquetConversions.Conv));
case DataType.Interval:
return(CreateGetterDelegateCore <Interval, TimeSpan>(col, _parquetConversions.Conv));
default:
return(CreateGetterDelegateCore <IList, ReadOnlyMemory <char> >(col, _parquetConversions.Conv));
}
}
/// <summary>
/// Returns whether the given column is active in this row.
/// </summary>
public override bool IsColumnActive(DataViewSchema.Column column)
{
Ch.CheckParam(column.Index < _colToActivesIndex.Length, nameof(column));
return(_colToActivesIndex[column.Index] >= 0);
}
/// <summary>
/// Returns a value getter delegate to fetch the value of column with the given columnIndex, from the row.
/// This throws if the column is not active in this row, or if the type
/// <typeparamref name="TValue"/> differs from this column's type.
/// </summary>
/// <typeparam name="TValue"> is the column's content type.</typeparam>
/// <param name="column"> is the output column whose getter should be returned.</param>
public override ValueGetter <TValue> GetGetter <TValue>(DataViewSchema.Column column)
{
Ch.CheckParam(IsColumnActive(column), nameof(column), "requested column not active");
return((ref TValue value) => throw Ch.Except(RowCursorUtils.FetchValueStateError));
}
/// <summary>
/// Returns whether the given column is active in this row.
/// </summary>
public override bool IsColumnActive(DataViewSchema.Column column)
{
Ch.CheckParam(column.Index < _active.Length, nameof(column));
_parent._groupBinding.CheckColumnInRange(column.Index);
return(_active[column.Index]);
}