public PrimitiveColumn <T> Clone(PrimitiveColumn <long> mapIndices = null, bool invertMapIndices = false)
{
if (mapIndices is null)
{
PrimitiveColumnContainer <T> newColumnContainer = _columnContainer.Clone();
return(new PrimitiveColumn <T>(Name, newColumnContainer));
}
else
{
if (mapIndices.Length != Length)
{
throw new ArgumentException(Strings.MismatchedColumnLengths, nameof(mapIndices));
}
PrimitiveColumn <T> ret = new PrimitiveColumn <T>(Name);
if (invertMapIndices == false)
{
for (long i = 0; i < mapIndices.Length; i++)
{
ret.Append(_columnContainer[mapIndices._columnContainer[i]]);
}
}
else
{
for (long i = Length - 1; i >= 0; i--)
{
ret.Append(_columnContainer[mapIndices._columnContainer[i]]);
}
}
return(ret);
}
}
public override BaseColumn CloneAndAppendNulls(BaseColumn mapIndices = null, bool invertMapIndices = false)
{
PrimitiveColumn <T> ret = Clone(mapIndices, invertMapIndices) as PrimitiveColumn <T>;
ret.AppendMany(null, NullCount);
return(ret);
}
public override BaseColumn CumulativeProduct(IEnumerable <long> rowIndices, bool inPlace = false)
{
PrimitiveColumn <T> ret = inPlace ? this : Clone();
PrimitiveColumnComputation <T> .Instance.CumulativeProduct(ret._columnContainer, rowIndices);
return(ret);
}
public override BaseColumn CumulativeSum(bool inPlace = false)
{
PrimitiveColumn <T> ret = inPlace ? this : Clone();
PrimitiveColumnComputation <T> .Instance.CumulativeSum(ret._columnContainer);
return(ret);
}
private void GetSortIndices(IComparer <T> comparer, out PrimitiveColumn <long> columnSortIndices)
{
List <List <int> > bufferSortIndices = new List <List <int> >(_columnContainer.Buffers.Count);
// Sort each buffer first
for (int b = 0; b < _columnContainer.Buffers.Count; b++)
{
ReadOnlyDataFrameBuffer <T> buffer = _columnContainer.Buffers[b];
int[] sortIndices = new int[buffer.Length];
for (int i = 0; i < buffer.Length; i++)
{
sortIndices[i] = i;
}
IntrospectiveSort(buffer.ReadOnlySpan, buffer.Length, sortIndices, comparer);
// Bug fix: QuickSort is not stable. When PrimitiveColumn has null values and default values, they move around
List <int> nonNullSortIndices = new List <int>();
for (int i = 0; i < sortIndices.Length; i++)
{
if (IsValid(sortIndices[i] + b * ReadOnlyDataFrameBuffer <T> .MaxCapacity))
{
nonNullSortIndices.Add(sortIndices[i]);
}
}
bufferSortIndices.Add(nonNullSortIndices);
}
// Simple merge sort to build the full column's sort indices
ValueTuple <T, int> GetFirstNonNullValueAndBufferIndexStartingAtIndex(int bufferIndex, int startIndex)
{
T value = _columnContainer.Buffers[bufferIndex][bufferSortIndices[bufferIndex][startIndex]];
long rowIndex = bufferSortIndices[bufferIndex][startIndex] + bufferIndex * ReadOnlyDataFrameBuffer <T> .MaxCapacity;
return(value, startIndex);
}
SortedDictionary <T, List <ValueTuple <int, int> > > heapOfValueAndListOfTupleOfSortAndBufferIndex = new SortedDictionary <T, List <ValueTuple <int, int> > >(comparer);
IList <ReadOnlyDataFrameBuffer <T> > buffers = _columnContainer.Buffers;
for (int i = 0; i < buffers.Count; i++)
{
ReadOnlyDataFrameBuffer <T> buffer = buffers[i];
if (bufferSortIndices[i].Count == 0)
{
// All nulls
continue;
}
ValueTuple <T, int> valueAndBufferIndex = GetFirstNonNullValueAndBufferIndexStartingAtIndex(i, 0);
if (heapOfValueAndListOfTupleOfSortAndBufferIndex.ContainsKey(valueAndBufferIndex.Item1))
{
heapOfValueAndListOfTupleOfSortAndBufferIndex[valueAndBufferIndex.Item1].Add((valueAndBufferIndex.Item2, i));
}
else
{
heapOfValueAndListOfTupleOfSortAndBufferIndex.Add(valueAndBufferIndex.Item1, new List <ValueTuple <int, int> >()
{
(valueAndBufferIndex.Item2, i)
});
public override PrimitiveColumn <bool> NotEquals <T>(T value)
{
PrimitiveColumn <bool> ret = new PrimitiveColumn <bool>(Name, Length);
string valString = value.ToString();
for (long i = 0; i < Length; i++)
{
ret[i] = (string)this[i] != valString;
}
return(ret);
}
public void InsertColumn <T>(int columnIndex, IEnumerable <T> column, string columnName, DataFrame parent)
where T : unmanaged
{
column = column ?? throw new ArgumentNullException(nameof(column));
if ((uint)columnIndex > _columns.Count)
{
throw new ArgumentOutOfRangeException(nameof(columnIndex));
}
BaseColumn newColumn = new PrimitiveColumn <T>(columnName, column);
InsertColumn(columnIndex, newColumn, parent);
}
private void GetSortIndices(IComparer <T> comparer, out PrimitiveColumn <long> columnSortIndices)
{
List <int[]> bufferSortIndices = new List <int[]>(_columnContainer.Buffers.Count);
// Sort each buffer first
foreach (DataFrameBuffer <T> buffer in _columnContainer.Buffers)
{
var sortIndices = new int[buffer.Length];
for (int i = 0; i < buffer.Length; i++)
{
sortIndices[i] = i;
}
IntrospectiveSort(buffer.Span, buffer.Length, sortIndices, comparer);
bufferSortIndices.Add(sortIndices);
}
// Simple merge sort to build the full column's sort indices
ValueTuple <T, int> GetFirstNonNullValueAndBufferIndexStartingAtIndex(int bufferIndex, int startIndex)
{
T value = _columnContainer.Buffers[bufferIndex][bufferSortIndices[bufferIndex][startIndex]];
long rowIndex = bufferSortIndices[bufferIndex][startIndex] + bufferIndex * _columnContainer.Buffers[0].MaxCapacity;
while (!IsValid(rowIndex) && ++startIndex < bufferSortIndices[bufferIndex].Length)
{
value = _columnContainer.Buffers[bufferIndex][bufferSortIndices[bufferIndex][startIndex]];
rowIndex = startIndex + bufferIndex * _columnContainer.Buffers[0].MaxCapacity;
}
return(value, startIndex);
}
SortedDictionary <T, List <ValueTuple <int, int> > > heapOfValueAndListOfTupleOfSortAndBufferIndex = new SortedDictionary <T, List <ValueTuple <int, int> > >(comparer);
IList <DataFrameBuffer <T> > buffers = _columnContainer.Buffers;
for (int i = 0; i < buffers.Count; i++)
{
DataFrameBuffer <T> buffer = buffers[i];
ValueTuple <T, int> valueAndBufferIndex = GetFirstNonNullValueAndBufferIndexStartingAtIndex(i, 0);
long columnIndex = valueAndBufferIndex.Item2 + i * bufferSortIndices[0].Length;
if (columnIndex == Length)
{
// All nulls
continue;
}
if (heapOfValueAndListOfTupleOfSortAndBufferIndex.ContainsKey(valueAndBufferIndex.Item1))
{
heapOfValueAndListOfTupleOfSortAndBufferIndex[valueAndBufferIndex.Item1].Add((valueAndBufferIndex.Item2, i));
}
else
{
heapOfValueAndListOfTupleOfSortAndBufferIndex.Add(valueAndBufferIndex.Item1, new List <ValueTuple <int, int> >()
{
(valueAndBufferIndex.Item2, i)
});
public override PrimitiveColumn <bool> NotEquals(BaseColumn column)
{
// TODO: Using indexing is VERY inefficient here. Each indexer call will find the "right" buffer and then return the value
if (Length != column.Length)
{
throw new ArgumentException(Strings.MismatchedColumnLengths, nameof(column));
}
PrimitiveColumn <bool> ret = new PrimitiveColumn <bool>(Name, Length);
for (long i = 0; i < Length; i++)
{
ret[i] = (string)this[i] != column[i].ToString();
}
return(ret);
}
public PrimitiveColumn <T> Clone(PrimitiveColumn <long> mapIndices = null, bool invertMapIndices = false)
{
if (mapIndices is null)
{
PrimitiveColumnContainer <T> newColumnContainer = _columnContainer.Clone();
return(new PrimitiveColumn <T>(Name, newColumnContainer));
}
else
{
if (mapIndices.Length > Length)
{
throw new ArgumentException(Strings.MapIndicesExceedsColumnLenth, nameof(mapIndices));
}
PrimitiveColumn <T> ret = new PrimitiveColumn <T>(Name, mapIndices.Length);
ret._columnContainer._modifyNullCountWhileIndexing = false;
if (invertMapIndices == false)
{
for (long i = 0; i < mapIndices.Length; i++)
{
T?value = _columnContainer[mapIndices._columnContainer[i].Value];
ret[i] = value;
if (!value.HasValue)
{
ret._columnContainer.NullCount++;
}
}
}
else
{
long mapIndicesIndex = mapIndices.Length - 1;
for (long i = 0; i < mapIndices.Length; i++)
{
T?value = _columnContainer[mapIndices._columnContainer[mapIndicesIndex - i].Value];
ret[i] = value;
if (!value.HasValue)
{
ret._columnContainer.NullCount++;
}
}
}
ret._columnContainer._modifyNullCountWhileIndexing = true;
return(ret);
}
}
private void GetSortIndices(IComparer <T> comparer, out PrimitiveColumn <long> columnSortIndices)
{
List <int[]> bufferSortIndices = new List <int[]>(_columnContainer.Buffers.Count);
// Sort each buffer first
foreach (DataFrameBuffer <T> buffer in _columnContainer.Buffers)
{
var sortIndices = new int[buffer.Length];
for (int i = 0; i < buffer.Length; i++)
{
sortIndices[i] = i;
}
IntrospectiveSort(buffer.Span, buffer.Length, sortIndices, comparer);
bufferSortIndices.Add(sortIndices);
}
// Simple merge sort to build the full column's sort indices
SortedDictionary <T, List <Tuple <int, int> > > heapOfValueAndListOfTupleOfSortAndBufferIndex = new SortedDictionary <T, List <Tuple <int, int> > >(comparer);
IList <DataFrameBuffer <T> > buffers = _columnContainer.Buffers;
for (int i = 0; i < buffers.Count; i++)
{
DataFrameBuffer <T> buffer = buffers[i];
T value = buffer[bufferSortIndices[i][0]];
if (heapOfValueAndListOfTupleOfSortAndBufferIndex.ContainsKey(value))
{
heapOfValueAndListOfTupleOfSortAndBufferIndex[value].Add(new Tuple <int, int>(0, i));
}
else
{
heapOfValueAndListOfTupleOfSortAndBufferIndex.Add(value, new List <Tuple <int, int> >()
{
new Tuple <int, int>(0, i)
});
}
}
columnSortIndices = new PrimitiveColumn <long>("SortIndices");
GetBufferSortIndex getBufferSortIndex = new GetBufferSortIndex((int bufferIndex, int sortIndex) => bufferSortIndices[bufferIndex][sortIndex]);
GetValueAtBuffer <T> getValueAtBuffer = new GetValueAtBuffer <T>((int bufferIndex, int sortIndex) => _columnContainer.Buffers[bufferIndex][bufferSortIndices[bufferIndex][sortIndex]]);
GetBufferLengthAtIndex getBufferLengthAtIndex = new GetBufferLengthAtIndex((int bufferIndex) => bufferSortIndices[bufferIndex].Length);
PopulateColumnSortIndicesWithHeap(heapOfValueAndListOfTupleOfSortAndBufferIndex, columnSortIndices, getBufferSortIndex, getValueAtBuffer, getBufferLengthAtIndex);
}
private void GetSortIndices(IComparer <T> comparer, out PrimitiveColumn <long> columnSortIndices)
{
List <List <int> > bufferSortIndices = new List <List <int> >(_columnContainer.Buffers.Count);
// Sort each buffer first
for (int b = 0; b < _columnContainer.Buffers.Count; b++)
{
ReadOnlyDataFrameBuffer <T> buffer = _columnContainer.Buffers[b];
ReadOnlySpan <byte> nullBitMapSpan = _columnContainer.NullBitMapBuffers[b].ReadOnlySpan;
int[] sortIndices = new int[buffer.Length];
for (int i = 0; i < buffer.Length; i++)
{
sortIndices[i] = i;
}
IntrospectiveSort(buffer.ReadOnlySpan, buffer.Length, sortIndices, comparer);
// Bug fix: QuickSort is not stable. When PrimitiveColumn has null values and default values, they move around
List <int> nonNullSortIndices = new List <int>();
for (int i = 0; i < sortIndices.Length; i++)
{
if (_columnContainer.IsValid(nullBitMapSpan, sortIndices[i]))
{
nonNullSortIndices.Add(sortIndices[i]);
}
}
bufferSortIndices.Add(nonNullSortIndices);
}
// Simple merge sort to build the full column's sort indices
ValueTuple <T, int> GetFirstNonNullValueAndBufferIndexStartingAtIndex(int bufferIndex, int startIndex)
{
int index = bufferSortIndices[bufferIndex][startIndex];
T value;
ReadOnlyMemory <byte> buffer = _columnContainer.Buffers[bufferIndex].ReadOnlyBuffer;
ReadOnlyMemory <T> typedBuffer = Unsafe.As <ReadOnlyMemory <byte>, ReadOnlyMemory <T> >(ref buffer);
if (!typedBuffer.IsEmpty)
{
bool isArray = MemoryMarshal.TryGetArray(typedBuffer, out ArraySegment <T> arraySegment);
if (isArray)
{
value = arraySegment.Array[index + arraySegment.Offset];
}
else
{
value = _columnContainer.Buffers[bufferIndex][index];
}
}
else
{
value = _columnContainer.Buffers[bufferIndex][index];
}
return(value, startIndex);
}
SortedDictionary <T, List <ValueTuple <int, int> > > heapOfValueAndListOfTupleOfSortAndBufferIndex = new SortedDictionary <T, List <ValueTuple <int, int> > >(comparer);
IList <ReadOnlyDataFrameBuffer <T> > buffers = _columnContainer.Buffers;
for (int i = 0; i < buffers.Count; i++)
{
ReadOnlyDataFrameBuffer <T> buffer = buffers[i];
if (bufferSortIndices[i].Count == 0)
{
// All nulls
continue;
}
ValueTuple <T, int> valueAndBufferIndex = GetFirstNonNullValueAndBufferIndexStartingAtIndex(i, 0);
if (heapOfValueAndListOfTupleOfSortAndBufferIndex.ContainsKey(valueAndBufferIndex.Item1))
{
heapOfValueAndListOfTupleOfSortAndBufferIndex[valueAndBufferIndex.Item1].Add((valueAndBufferIndex.Item2, i));
}
else
{
heapOfValueAndListOfTupleOfSortAndBufferIndex.Add(valueAndBufferIndex.Item1, new List <ValueTuple <int, int> >()
{
(valueAndBufferIndex.Item2, i)
});
public override BaseColumn Sort(bool ascending = true)
{
PrimitiveColumn <long> sortIndices = GetAscendingSortIndices() as PrimitiveColumn <long>;
return(Clone(sortIndices, !ascending, NullCount));
}
/// <summary>
/// Reads a text file as a DataFrame.
/// Follows pandas API.
/// </summary>
/// <param name="createStream">function which creates a stream</param>
/// <param name="separator">column separator</param>
/// <param name="header">has a header or not</param>
/// <param name="columnNames">column names (can be empty)</param>
/// <param name="dataTypes">column types (can be empty)</param>
/// <param name="numberOfRowsToRead">number of rows to read not including the header(if present)</param>
/// <param name="guessRows">number of rows used to guess types</param>
/// <param name="addIndexColumn">add one column with the row index</param>
/// <returns>DataFrame</returns>
public static DataFrame ReadStream(Func <StreamReader> createStream,
char separator = ',', bool header = true,
string[] columnNames = null, Type[] dataTypes = null,
long numberOfRowsToRead = -1, int guessRows = 10, bool addIndexColumn = false)
{
var linesForGuessType = new List <string[]>();
long rowline = 0;
int numberOfColumns = 0;
if (header == true && numberOfRowsToRead != -1)
{
numberOfRowsToRead++;
}
// First pass: schema and number of rows.
using (var st = createStream())
{
string line = st.ReadLine();
while (line != null)
{
if ((numberOfRowsToRead == -1) || rowline < numberOfRowsToRead)
{
if (linesForGuessType.Count < guessRows)
{
var spl = line.Split(separator);
if (header && rowline == 0)
{
if (columnNames == null)
{
columnNames = spl;
}
}
else
{
linesForGuessType.Add(spl);
numberOfColumns = Math.Max(numberOfColumns, spl.Length);
}
}
}
++rowline;
if (rowline == numberOfRowsToRead)
{
break;
}
line = st.ReadLine();
}
}
if (linesForGuessType.Count == 0)
{
throw new FormatException(Strings.EmptyFile);
}
List <BaseColumn> columns = new List <BaseColumn>(numberOfColumns);
// Guesses types and adds columns.
for (int i = 0; i < numberOfColumns; ++i)
{
Type kind = GuessKind(i, linesForGuessType);
if (kind == typeof(bool))
{
BaseColumn boolColumn = new PrimitiveColumn <bool>(columnNames == null ? "Column" + i.ToString() : columnNames[i], header == true ? rowline - 1 : rowline);
columns.Add(boolColumn);
}
else if (kind == typeof(float))
{
BaseColumn floatColumn = new PrimitiveColumn <float>(columnNames == null ? "Column" + i.ToString() : columnNames[i], header == true ? rowline - 1 : rowline);
columns.Add(floatColumn);
}
else if (kind == typeof(string))
{
BaseColumn stringColumn = new StringColumn(columnNames == null ? "Column" + i.ToString() : columnNames[i], header == true ? rowline - 1 : rowline);
columns.Add(stringColumn);
}
else
{
throw new NotSupportedException(nameof(kind));
}
}
// Fills values.
using (StreamReader st = createStream())
{
string line = st.ReadLine();
rowline = 0;
while (line != null && (numberOfRowsToRead == -1 || rowline < numberOfRowsToRead))
{
var spl = line.Split(separator);
if (header && rowline == 0)
{
// Skips.
}
else
{
AppendRow(columns, header == true ? rowline - 1 : rowline, spl);
}
++rowline;
line = st.ReadLine();
}
}
if (addIndexColumn)
{
PrimitiveColumn <int> indexColumn = new PrimitiveColumn <int>("IndexColumn", columns[0].Length);
for (int i = 0; i < columns[0].Length; i++)
{
indexColumn[i] = i;
}
columns.Insert(0, indexColumn);
}
return(new DataFrame(columns));
}
// TODO: Merge API with an "On" parameter that merges on a column common to 2 dataframes
/// <summary>
/// Merge DataFrames with a database style join
/// </summary>
/// <param name="other"></param>
/// <param name="leftJoinColumn"></param>
/// <param name="rightJoinColumn"></param>
/// <param name="leftSuffix"></param>
/// <param name="rightSuffix"></param>
/// <param name="joinAlgorithm"></param>
/// <returns></returns>
public DataFrame Merge <TKey>(DataFrame other, string leftJoinColumn, string rightJoinColumn, string leftSuffix = "_left", string rightSuffix = "_right", JoinAlgorithm joinAlgorithm = JoinAlgorithm.Left)
{
// A simple hash join
DataFrame ret = new DataFrame();
PrimitiveColumn <long> emptyMap = new PrimitiveColumn <long>("Empty");
for (int i = 0; i < ColumnCount; i++)
{
// Create empty columns
BaseColumn column = Column(i).Clone(emptyMap);
ret.InsertColumn(ret.ColumnCount, column);
}
for (int i = 0; i < other.ColumnCount; i++)
{
// Create empty columns
BaseColumn column = other.Column(i).Clone(emptyMap);
SetSuffixForDuplicatedColumnNames(ret, column, leftSuffix, rightSuffix);
ret.InsertColumn(ret.ColumnCount, column);
}
// The final table size is not known until runtime
long rowNumber = 0;
if (joinAlgorithm == JoinAlgorithm.Left)
{
// First hash other dataframe on the rightJoinColumn
BaseColumn otherColumn = other[rightJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = otherColumn.GroupColumnValues <TKey>();
// Go over the records in this dataframe and match with the dictionary
BaseColumn thisColumn = this[leftJoinColumn];
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(thisColumn.Length);
}
for (long i = 0; i < thisColumn.Length; i++)
{
if (rowNumber >= thisColumn.Length)
{
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(rowNumber + 1);
}
}
TKey value = (TKey)(thisColumn[i] ?? default(TKey));
if (multimap.TryGetValue(value, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (thisColumn[i] == null)
{
// Match only with nulls in otherColumn
if (otherColumn[row] == null)
{
AppendForMerge(ret, rowNumber++, this, other, i, row);
}
}
else
{
// Cannot match nulls in otherColumn
if (otherColumn[row] != null)
{
AppendForMerge(ret, rowNumber++, this, other, i, row);
}
}
}
}
else
{
AppendForMerge(ret, rowNumber++, this, other, i, -1);
}
}
ret._table.RowCount = rowNumber;
}
else if (joinAlgorithm == JoinAlgorithm.Right)
{
BaseColumn thisColumn = this[leftJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = thisColumn.GroupColumnValues <TKey>();
BaseColumn otherColumn = other[rightJoinColumn];
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(otherColumn.Length);
}
for (long i = 0; i < otherColumn.Length; i++)
{
if (rowNumber >= otherColumn.Length)
{
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(rowNumber + 1);
}
}
TKey value = (TKey)(otherColumn[i] ?? default(TKey));
if (multimap.TryGetValue(value, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (otherColumn[i] == null)
{
if (thisColumn[row] == null)
{
AppendForMerge(ret, rowNumber++, this, other, row, i);
}
}
else
{
if (thisColumn[row] != null)
{
AppendForMerge(ret, rowNumber++, this, other, row, i);
}
}
}
}
else
{
AppendForMerge(ret, rowNumber++, this, other, -1, i);
}
}
ret._table.RowCount = rowNumber;
}
else if (joinAlgorithm == JoinAlgorithm.Inner)
{
// Hash the column with the smaller RowCount
long leftRowCount = RowCount;
long rightRowCount = other.RowCount;
DataFrame longerDataFrame = leftRowCount < rightRowCount ? other : this;
DataFrame shorterDataFrame = ReferenceEquals(longerDataFrame, this) ? other : this;
BaseColumn hashColumn = (leftRowCount < rightRowCount) ? this[leftJoinColumn] : other[rightJoinColumn];
BaseColumn otherColumn = ReferenceEquals(hashColumn, this[leftJoinColumn]) ? other[rightJoinColumn] : this[leftJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = hashColumn.GroupColumnValues <TKey>();
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(1);
}
for (long i = 0; i < otherColumn.Length; i++)
{
if (rowNumber >= ret.Column(0).Length)
{
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(rowNumber + 1);
}
}
TKey value = (TKey)(otherColumn[i] ?? default(TKey));
if (multimap.TryGetValue(value, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (otherColumn[i] == null)
{
if (hashColumn[row] == null)
{
AppendForMerge(ret, rowNumber++, this, other, ReferenceEquals(this, shorterDataFrame) ? row : i, ReferenceEquals(this, shorterDataFrame) ? i : row);
}
}
else
{
if (hashColumn[row] != null)
{
AppendForMerge(ret, rowNumber++, this, other, ReferenceEquals(this, shorterDataFrame) ? row : i, ReferenceEquals(this, shorterDataFrame) ? i : row);
}
}
}
}
}
ret._table.RowCount = rowNumber;
}
else if (joinAlgorithm == JoinAlgorithm.FullOuter)
{
BaseColumn otherColumn = other[rightJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = otherColumn.GroupColumnValues <TKey>();
Dictionary <TKey, long> intersection = new Dictionary <TKey, long>(EqualityComparer <TKey> .Default);
// Go over the records in this dataframe and match with the dictionary
BaseColumn thisColumn = this[leftJoinColumn];
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(thisColumn.Length + 1);
}
for (long i = 0; i < thisColumn.Length; i++)
{
if (rowNumber >= thisColumn.Length)
{
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(rowNumber + 1);
}
}
TKey value = (TKey)(thisColumn[i] ?? default(TKey));
if (multimap.TryGetValue(value, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (thisColumn[i] == null)
{
// Has to match only with nulls in otherColumn
if (otherColumn[row] == null)
{
AppendForMerge(ret, rowNumber++, this, other, i, row);
if (!intersection.ContainsKey(value))
{
intersection.Add(value, rowNumber);
}
}
}
else
{
// Cannot match to nulls in otherColumn
if (otherColumn[row] != null)
{
AppendForMerge(ret, rowNumber++, this, other, i, row);
if (!intersection.ContainsKey(value))
{
intersection.Add(value, rowNumber);
}
}
}
}
}
else
{
AppendForMerge(ret, rowNumber++, this, other, i, -1);
}
}
for (long i = 0; i < otherColumn.Length; i++)
{
if (rowNumber >= ret.Column(0).Length)
{
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(rowNumber + 1);
}
}
TKey value = (TKey)(otherColumn[i] ?? default(TKey));
if (!intersection.ContainsKey(value))
{
if (rowNumber >= otherColumn.Length)
{
for (int c = 0; c < ret.ColumnCount; c++)
{
ret.Column(c).Resize(rowNumber + 1);
}
}
AppendForMerge(ret, rowNumber++, this, other, -1, i);
}
}
ret._table.RowCount = rowNumber;
}
return(ret);
}
public override BaseColumn Sort(bool ascending = true)
{
PrimitiveColumn<long> sortIndices = GetAscendingSortIndices() as PrimitiveColumn<long>;
return CloneAndAppendNulls(sortIndices, !ascending);
}
public DataFrame(RecordBatch recordBatch)
{
_table = new DataFrameTable();
Apache.Arrow.Schema arrowSchema = recordBatch.Schema;
int fieldIndex = 0;
IEnumerable <IArrowArray> arrowArrays = recordBatch.Arrays;
foreach (IArrowArray arrowArray in arrowArrays)
{
Field field = arrowSchema.GetFieldByIndex(fieldIndex);
IArrowType fieldType = field.DataType;
BaseColumn dataFrameColumn = null;
switch (fieldType.TypeId)
{
case ArrowTypeId.Boolean:
BooleanArray arrowBooleanArray = (BooleanArray)arrowArray;
ReadOnlyMemory <byte> valueBuffer = arrowBooleanArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> nullBitMapBuffer = arrowBooleanArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <bool>(field.Name, valueBuffer, nullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.Double:
PrimitiveArray <double> arrowDoubleArray = (PrimitiveArray <double>)arrowArray;
ReadOnlyMemory <byte> doubleValueBuffer = arrowDoubleArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> doubleNullBitMapBuffer = arrowDoubleArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <double>(field.Name, doubleValueBuffer, doubleNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.Float:
PrimitiveArray <float> arrowFloatArray = (PrimitiveArray <float>)arrowArray;
ReadOnlyMemory <byte> floatValueBuffer = arrowFloatArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> floatNullBitMapBuffer = arrowFloatArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <float>(field.Name, floatValueBuffer, floatNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.Int8:
PrimitiveArray <sbyte> arrowsbyteArray = (PrimitiveArray <sbyte>)arrowArray;
ReadOnlyMemory <byte> sbyteValueBuffer = arrowsbyteArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> sbyteNullBitMapBuffer = arrowsbyteArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <sbyte>(field.Name, sbyteValueBuffer, sbyteNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.Int16:
PrimitiveArray <short> arrowshortArray = (PrimitiveArray <short>)arrowArray;
ReadOnlyMemory <byte> shortValueBuffer = arrowshortArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> shortNullBitMapBuffer = arrowshortArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <short>(field.Name, shortValueBuffer, shortNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.Int32:
PrimitiveArray <int> arrowIntArray = (PrimitiveArray <int>)arrowArray;
ReadOnlyMemory <byte> intValueBuffer = arrowIntArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> intNullBitMapBuffer = arrowIntArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <int>(field.Name, intValueBuffer, intNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.Int64:
PrimitiveArray <long> arrowLongArray = (PrimitiveArray <long>)arrowArray;
ReadOnlyMemory <byte> longValueBuffer = arrowLongArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> longNullBitMapBuffer = arrowLongArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <long>(field.Name, longValueBuffer, longNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.String:
StringArray stringArray = (StringArray)arrowArray;
ReadOnlyMemory <byte> dataMemory = stringArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> offsetsMemory = stringArray.ValueOffsetsBuffer.Memory;
ReadOnlyMemory <byte> nullMemory = stringArray.NullBitmapBuffer.Memory;
dataFrameColumn = new ArrowStringColumn(field.Name, dataMemory, offsetsMemory, nullMemory, stringArray.Length, stringArray.NullCount);
break;
case ArrowTypeId.UInt8:
PrimitiveArray <byte> arrowbyteArray = (PrimitiveArray <byte>)arrowArray;
ReadOnlyMemory <byte> byteValueBuffer = arrowbyteArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> byteNullBitMapBuffer = arrowbyteArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <byte>(field.Name, byteValueBuffer, byteNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.UInt16:
PrimitiveArray <ushort> arrowUshortArray = (PrimitiveArray <ushort>)arrowArray;
ReadOnlyMemory <byte> ushortValueBuffer = arrowUshortArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> ushortNullBitMapBuffer = arrowUshortArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <ushort>(field.Name, ushortValueBuffer, ushortNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.UInt32:
PrimitiveArray <uint> arrowUintArray = (PrimitiveArray <uint>)arrowArray;
ReadOnlyMemory <byte> uintValueBuffer = arrowUintArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> uintNullBitMapBuffer = arrowUintArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <uint>(field.Name, uintValueBuffer, uintNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.UInt64:
PrimitiveArray <ulong> arrowUlongArray = (PrimitiveArray <ulong>)arrowArray;
ReadOnlyMemory <byte> ulongValueBuffer = arrowUlongArray.ValueBuffer.Memory;
ReadOnlyMemory <byte> ulongNullBitMapBuffer = arrowUlongArray.NullBitmapBuffer.Memory;
dataFrameColumn = new PrimitiveColumn <ulong>(field.Name, ulongValueBuffer, ulongNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
break;
case ArrowTypeId.Decimal:
case ArrowTypeId.Binary:
case ArrowTypeId.Date32:
case ArrowTypeId.Date64:
case ArrowTypeId.Dictionary:
case ArrowTypeId.FixedSizedBinary:
case ArrowTypeId.HalfFloat:
case ArrowTypeId.Interval:
case ArrowTypeId.List:
case ArrowTypeId.Map:
case ArrowTypeId.Null:
case ArrowTypeId.Struct:
case ArrowTypeId.Time32:
case ArrowTypeId.Time64:
default:
throw new NotImplementedException(nameof(fieldType.Name));
}
_table.InsertColumn(ColumnCount, dataFrameColumn);
fieldIndex++;
}
}
public DataFrame Join(DataFrame other, string leftSuffix = "_left", string rightSuffix = "_right", JoinAlgorithm joinAlgorithm = JoinAlgorithm.Left)
{
DataFrame ret = new DataFrame();
if (joinAlgorithm == JoinAlgorithm.Left)
{
for (int i = 0; i < ColumnCount; i++)
{
BaseColumn newColumn = Column(i).Clone();
ret.InsertColumn(ret.ColumnCount, newColumn);
}
long minLength = Math.Min(RowCount, other.RowCount);
PrimitiveColumn <long> mapIndices = new PrimitiveColumn <long>("mapIndices", minLength);
for (long i = 0; i < minLength; i++)
{
mapIndices[i] = i;
}
for (int i = 0; i < other.ColumnCount; i++)
{
BaseColumn newColumn;
if (other.RowCount < RowCount)
{
newColumn = other.Column(i).Clone(numberOfNullsToAppend: RowCount - other.RowCount);
}
else
{
newColumn = other.Column(i).Clone(mapIndices);
}
SetSuffixForDuplicatedColumnNames(ret, newColumn, leftSuffix, rightSuffix);
ret.InsertColumn(ret.ColumnCount, newColumn);
}
}
else if (joinAlgorithm == JoinAlgorithm.Right)
{
long minLength = Math.Min(RowCount, other.RowCount);
PrimitiveColumn <long> mapIndices = new PrimitiveColumn <long>("mapIndices", minLength);
for (long i = 0; i < minLength; i++)
{
mapIndices[i] = i;
}
for (int i = 0; i < ColumnCount; i++)
{
BaseColumn newColumn;
if (RowCount < other.RowCount)
{
newColumn = Column(i).Clone(numberOfNullsToAppend: other.RowCount - RowCount);
}
else
{
newColumn = Column(i).Clone(mapIndices);
}
ret.InsertColumn(ret.ColumnCount, newColumn);
}
for (int i = 0; i < other.ColumnCount; i++)
{
BaseColumn newColumn = other.Column(i).Clone();
SetSuffixForDuplicatedColumnNames(ret, newColumn, leftSuffix, rightSuffix);
ret.InsertColumn(ret.ColumnCount, newColumn);
}
}
else if (joinAlgorithm == JoinAlgorithm.FullOuter)
{
long newRowCount = Math.Max(RowCount, other.RowCount);
long numberOfNulls = newRowCount - RowCount;
for (int i = 0; i < ColumnCount; i++)
{
BaseColumn newColumn = Column(i).Clone(numberOfNullsToAppend: numberOfNulls);
ret.InsertColumn(ret.ColumnCount, newColumn);
}
numberOfNulls = newRowCount - other.RowCount;
for (int i = 0; i < other.ColumnCount; i++)
{
BaseColumn newColumn = other.Column(i).Clone(numberOfNullsToAppend: numberOfNulls);
SetSuffixForDuplicatedColumnNames(ret, newColumn, leftSuffix, rightSuffix);
ret.InsertColumn(ret.ColumnCount, newColumn);
}
}
else if (joinAlgorithm == JoinAlgorithm.Inner)
{
long newRowCount = Math.Min(RowCount, other.RowCount);
PrimitiveColumn <long> mapIndices = new PrimitiveColumn <long>("mapIndices", newRowCount);
for (long i = 0; i < newRowCount; i++)
{
mapIndices[i] = i;
}
for (int i = 0; i < ColumnCount; i++)
{
BaseColumn newColumn = Column(i).Clone(mapIndices);
ret.InsertColumn(ret.ColumnCount, newColumn);
}
for (int i = 0; i < other.ColumnCount; i++)
{
BaseColumn newColumn = other.Column(i).Clone(mapIndices);
SetSuffixForDuplicatedColumnNames(ret, newColumn, leftSuffix, rightSuffix);
ret.InsertColumn(ret.ColumnCount, newColumn);
}
}
return(ret);
}
// TODO: Merge API with an "On" parameter that merges on a column common to 2 dataframes
/// <summary>
/// Merge DataFrames with a database style join
/// </summary>
/// <param name="other"></param>
/// <param name="leftJoinColumn"></param>
/// <param name="rightJoinColumn"></param>
/// <param name="leftSuffix"></param>
/// <param name="rightSuffix"></param>
/// <param name="joinAlgorithm"></param>
/// <returns></returns>
public DataFrame Merge <TKey>(DataFrame other, string leftJoinColumn, string rightJoinColumn, string leftSuffix = "_left", string rightSuffix = "_right", JoinAlgorithm joinAlgorithm = JoinAlgorithm.Left)
{
// A simple hash join
DataFrame ret = new DataFrame();
DataFrame leftDataFrame = this;
DataFrame rightDataFrame = other;
// The final table size is not known until runtime
long rowNumber = 0;
PrimitiveColumn <long> leftRowIndices = new PrimitiveColumn <long>("LeftIndices");
PrimitiveColumn <long> rightRowIndices = new PrimitiveColumn <long>("RightIndices");
if (joinAlgorithm == JoinAlgorithm.Left)
{
// First hash other dataframe on the rightJoinColumn
BaseColumn otherColumn = other[rightJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = otherColumn.GroupColumnValues <TKey>();
// Go over the records in this dataframe and match with the dictionary
BaseColumn thisColumn = this[leftJoinColumn];
for (long i = 0; i < thisColumn.Length; i++)
{
var thisColumnValue = thisColumn[i];
TKey thisColumnValueOrDefault = (TKey)(thisColumnValue == null ? default(TKey) : thisColumnValue);
if (multimap.TryGetValue(thisColumnValueOrDefault, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (thisColumnValue == null)
{
// Match only with nulls in otherColumn
if (otherColumn[row] == null)
{
leftRowIndices.Append(i);
rightRowIndices.Append(row);
}
}
else
{
// Cannot match nulls in otherColumn
if (otherColumn[row] != null)
{
leftRowIndices.Append(i);
rightRowIndices.Append(row);
}
}
}
}
else
{
leftRowIndices.Append(i);
rightRowIndices.Append(null);
}
}
}
else if (joinAlgorithm == JoinAlgorithm.Right)
{
BaseColumn thisColumn = this[leftJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = thisColumn.GroupColumnValues <TKey>();
BaseColumn otherColumn = other[rightJoinColumn];
for (long i = 0; i < otherColumn.Length; i++)
{
var otherColumnValue = otherColumn[i];
TKey otherColumnValueOrDefault = (TKey)(otherColumnValue == null ? default(TKey) : otherColumnValue);
if (multimap.TryGetValue(otherColumnValueOrDefault, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (otherColumnValue == null)
{
if (thisColumn[row] == null)
{
leftRowIndices.Append(row);
rightRowIndices.Append(i);
}
}
else
{
if (thisColumn[row] != null)
{
leftRowIndices.Append(row);
rightRowIndices.Append(i);
}
}
}
}
else
{
leftRowIndices.Append(null);
rightRowIndices.Append(i);
}
}
}
else if (joinAlgorithm == JoinAlgorithm.Inner)
{
// Hash the column with the smaller RowCount
long leftRowCount = RowCount;
long rightRowCount = other.RowCount;
DataFrame longerDataFrame = leftRowCount < rightRowCount ? other : this;
DataFrame shorterDataFrame = ReferenceEquals(longerDataFrame, this) ? other : this;
BaseColumn hashColumn = (leftRowCount < rightRowCount) ? this[leftJoinColumn] : other[rightJoinColumn];
BaseColumn otherColumn = ReferenceEquals(hashColumn, this[leftJoinColumn]) ? other[rightJoinColumn] : this[leftJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = hashColumn.GroupColumnValues <TKey>();
for (long i = 0; i < otherColumn.Length; i++)
{
var otherColumnValue = otherColumn[i];
TKey otherColumnValueOrDefault = (TKey)(otherColumnValue == null ? default(TKey) : otherColumnValue);
if (multimap.TryGetValue(otherColumnValueOrDefault, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (otherColumnValue == null)
{
if (hashColumn[row] == null)
{
leftRowIndices.Append(row);
rightRowIndices.Append(i);
}
}
else
{
if (hashColumn[row] != null)
{
leftRowIndices.Append(row);
rightRowIndices.Append(i);
}
}
}
}
}
leftDataFrame = shorterDataFrame;
rightDataFrame = longerDataFrame;
}
else if (joinAlgorithm == JoinAlgorithm.FullOuter)
{
BaseColumn otherColumn = other[rightJoinColumn];
Dictionary <TKey, ICollection <long> > multimap = otherColumn.GroupColumnValues <TKey>();
Dictionary <TKey, long> intersection = new Dictionary <TKey, long>(EqualityComparer <TKey> .Default);
// Go over the records in this dataframe and match with the dictionary
BaseColumn thisColumn = this[leftJoinColumn];
for (long i = 0; i < thisColumn.Length; i++)
{
var thisColumnValue = thisColumn[i];
TKey thisColumnValueOrDefault = (TKey)(thisColumnValue == null ? default(TKey) : thisColumnValue);
if (multimap.TryGetValue(thisColumnValueOrDefault, out ICollection <long> rowNumbers))
{
foreach (long row in rowNumbers)
{
if (thisColumnValue == null)
{
// Has to match only with nulls in otherColumn
if (otherColumn[row] == null)
{
leftRowIndices.Append(i);
rightRowIndices.Append(row);
if (!intersection.ContainsKey(thisColumnValueOrDefault))
{
intersection.Add(thisColumnValueOrDefault, rowNumber);
}
}
}
else
{
// Cannot match to nulls in otherColumn
if (otherColumn[row] != null)
{
leftRowIndices.Append(i);
rightRowIndices.Append(row);
if (!intersection.ContainsKey(thisColumnValueOrDefault))
{
intersection.Add(thisColumnValueOrDefault, rowNumber);
}
}
}
}
}
else
{
leftRowIndices.Append(i);
rightRowIndices.Append(null);
}
}
for (long i = 0; i < otherColumn.Length; i++)
{
TKey value = (TKey)(otherColumn[i] ?? default(TKey));
if (!intersection.ContainsKey(value))
{
leftRowIndices.Append(null);
rightRowIndices.Append(i);
}
}
}
else
{
throw new NotImplementedException(nameof(joinAlgorithm));
}
for (int i = 0; i < leftDataFrame.ColumnCount; i++)
{
ret.InsertColumn(i, leftDataFrame.Column(i).Clone(leftRowIndices));
}
for (int i = 0; i < rightDataFrame.ColumnCount; i++)
{
BaseColumn column = rightDataFrame.Column(i).Clone(rightRowIndices);
SetSuffixForDuplicatedColumnNames(ret, column, leftSuffix, rightSuffix);
ret.InsertColumn(ret.ColumnCount, column);
}
return(ret);
}
