示例#1
0
        private static DataFrameColumn CreateColumn(Type kind, string[] columnNames, int columnIndex)
        {
            DataFrameColumn ret;

            if (kind == typeof(bool))
            {
                ret = new BooleanDataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(int))
            {
                ret = new Int32DataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(float))
            {
                ret = new SingleDataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(string))
            {
                ret = new StringDataFrameColumn(GetColumnName(columnNames, columnIndex), 0);
            }
            else if (kind == typeof(long))
            {
                ret = new Int64DataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(decimal))
            {
                ret = new DecimalDataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(byte))
            {
                ret = new ByteDataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(char))
            {
                ret = new CharDataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(double))
            {
                ret = new DoubleDataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(sbyte))
            {
                ret = new SByteDataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(short))
            {
                ret = new Int16DataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(uint))
            {
                ret = new UInt32DataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(ulong))
            {
                ret = new UInt64DataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else if (kind == typeof(ushort))
            {
                ret = new UInt16DataFrameColumn(GetColumnName(columnNames, columnIndex));
            }
            else
            {
                throw new NotSupportedException(nameof(kind));
            }
            return(ret);
        }
示例#2
0
        private static void AppendDataFrameColumnFromArrowArray(Field field, IArrowArray arrowArray, DataFrame ret, string fieldNamePrefix = "")
        {
            IArrowType      fieldType       = field.DataType;
            DataFrameColumn dataFrameColumn = null;
            string          fieldName       = fieldNamePrefix + field.Name;

            switch (fieldType.TypeId)
            {
            case ArrowTypeId.Boolean:
                BooleanArray          arrowBooleanArray = (BooleanArray)arrowArray;
                ReadOnlyMemory <byte> valueBuffer       = arrowBooleanArray.ValueBuffer.Memory;
                ReadOnlyMemory <byte> nullBitMapBuffer  = arrowBooleanArray.NullBitmapBuffer.Memory;
                dataFrameColumn = new BooleanDataFrameColumn(fieldName, 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 DoubleDataFrameColumn(fieldName, 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 SingleDataFrameColumn(fieldName, 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 SByteDataFrameColumn(fieldName, 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 Int16DataFrameColumn(fieldName, 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 Int32DataFrameColumn(fieldName, 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 Int64DataFrameColumn(fieldName, 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 ArrowStringDataFrameColumn(fieldName, 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 ByteDataFrameColumn(fieldName, 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 UInt16DataFrameColumn(fieldName, 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 UInt32DataFrameColumn(fieldName, 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 UInt64DataFrameColumn(fieldName, ulongValueBuffer, ulongNullBitMapBuffer, arrowArray.Length, arrowArray.NullCount);
                break;

            case ArrowTypeId.Struct:
                StructArray               structArray           = (StructArray)arrowArray;
                StructType                structType            = (StructType)field.DataType;
                IEnumerator <Field>       fieldsEnumerator      = structType.Fields.GetEnumerator();
                IEnumerator <IArrowArray> structArrayEnumerator = structArray.Fields.GetEnumerator();
                while (fieldsEnumerator.MoveNext() && structArrayEnumerator.MoveNext())
                {
                    AppendDataFrameColumnFromArrowArray(fieldsEnumerator.Current, structArrayEnumerator.Current, ret, field.Name + "_");
                }
                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.Time32:
            case ArrowTypeId.Time64:
            default:
                throw new NotImplementedException(nameof(fieldType.Name));
            }

            if (dataFrameColumn != null)
            {
                ret.Columns.Insert(ret.Columns.Count, dataFrameColumn);
            }
        }
示例#3
0
        /// <summary>
        /// Wraps a <see cref="DataFrame"/> around an Arrow <see cref="RecordBatch"/> without copying data
        /// </summary>
        /// <param name="recordBatch"></param>
        /// <returns><see cref="DataFrame"/></returns>
        public static DataFrame FromArrowRecordBatch(RecordBatch recordBatch)
        {
            DataFrame ret = new DataFrame();

            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;
                DataFrameColumn 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 BooleanDataFrameColumn(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 DoubleDataFrameColumn(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 SingleDataFrameColumn(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 SByteDataFrameColumn(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 Int16DataFrameColumn(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 Int32DataFrameColumn(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 Int64DataFrameColumn(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 ArrowStringDataFrameColumn(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 ByteDataFrameColumn(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 UInt16DataFrameColumn(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 UInt32DataFrameColumn(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 UInt64DataFrameColumn(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));
                }
                ret.Columns.Insert(ret.Columns.Count, dataFrameColumn);
                fieldIndex++;
            }
            return(ret);
        }