public void TestEmptyDataFrameRecordBatch()
{
PrimitiveColumn <int> ageColumn = new PrimitiveColumn <int>("Age");
PrimitiveColumn <int> lengthColumn = new PrimitiveColumn <int>("CharCount");
DataFrame df = new DataFrame(new List <BaseColumn>()
{
ageColumn, lengthColumn
});
IEnumerable <RecordBatch> recordBatches = df.AsArrowRecordBatches();
bool foundARecordBatch = false;
foreach (RecordBatch recordBatch in recordBatches)
{
foundARecordBatch = true;
MemoryStream stream = new MemoryStream();
ArrowStreamWriter writer = new ArrowStreamWriter(stream, recordBatch.Schema);
writer.WriteRecordBatchAsync(recordBatch).GetAwaiter().GetResult();
stream.Position = 0;
ArrowStreamReader reader = new ArrowStreamReader(stream);
RecordBatch readRecordBatch = reader.ReadNextRecordBatch();
while (readRecordBatch != null)
{
RecordBatchComparer.CompareBatches(recordBatch, readRecordBatch);
readRecordBatch = reader.ReadNextRecordBatch();
}
}
Assert.True(foundARecordBatch);
}
public void TestArrowIntegration()
{
RecordBatch originalBatch = new RecordBatch.Builder()
.Append("Column1", false, col => col.Int32(array => array.AppendRange(Enumerable.Range(0, 10))))
.Append("Column2", true, new Int32Array(
valueBuffer: new ArrowBuffer.Builder <int>().AppendRange(Enumerable.Range(0, 10)).Build(),
nullBitmapBuffer: new ArrowBuffer.Builder <byte>().Append(0xfd).Append(0xff).Build(),
length: 10,
nullCount: 1,
offset: 0))
.Append("Column3", true, new Int32Array(
valueBuffer: new ArrowBuffer.Builder <int>().AppendRange(Enumerable.Range(0, 10)).Build(),
nullBitmapBuffer: new ArrowBuffer.Builder <byte>().Append(0x00).Append(0x00).Build(),
length: 10,
nullCount: 10,
offset: 0))
.Append("NullableBooleanColumn", true, new BooleanArray(
valueBuffer: new ArrowBuffer.Builder <byte>().Append(0xfd).Append(0xff).Build(),
nullBitmapBuffer: new ArrowBuffer.Builder <byte>().Append(0xed).Append(0xff).Build(),
length: 10,
nullCount: 2,
offset: 0))
.Append("StringColumn", false, new StringArray.Builder().AppendRange(Enumerable.Range(0, 10).Select(x => x.ToString())).Build())
.Append("DoubleColumn", false, new DoubleArray.Builder().AppendRange(Enumerable.Repeat(1.0, 10)).Build())
.Append("FloatColumn", false, new FloatArray.Builder().AppendRange(Enumerable.Repeat(1.0f, 10)).Build())
.Append("ShortColumn", false, new Int16Array.Builder().AppendRange(Enumerable.Repeat((short)1, 10)).Build())
.Append("LongColumn", false, new Int64Array.Builder().AppendRange(Enumerable.Repeat((long)1, 10)).Build())
.Append("UIntColumn", false, new UInt32Array.Builder().AppendRange(Enumerable.Repeat((uint)1, 10)).Build())
.Append("UShortColumn", false, new UInt16Array.Builder().AppendRange(Enumerable.Repeat((ushort)1, 10)).Build())
.Append("ULongColumn", false, new UInt64Array.Builder().AppendRange(Enumerable.Repeat((ulong)1, 10)).Build())
.Append("ByteColumn", false, new Int8Array.Builder().AppendRange(Enumerable.Repeat((sbyte)1, 10)).Build())
.Append("UByteColumn", false, new UInt8Array.Builder().AppendRange(Enumerable.Repeat((byte)1, 10)).Build())
.Build();
DataFrame df = new DataFrame(originalBatch);
IEnumerable <RecordBatch> recordBatches = df.AsArrowRecordBatches();
foreach (RecordBatch batch in recordBatches)
{
RecordBatchComparer.CompareBatches(originalBatch, batch);
}
}