public void TestStructArray()
{
// The following can be improved with a Builder class for StructArray.
List <Field> fields = new List <Field>();
Field.Builder fieldBuilder = new Field.Builder();
fields.Add(fieldBuilder.Name("Strings").DataType(StringType.Default).Nullable(true).Build());
fieldBuilder = new Field.Builder();
fields.Add(fieldBuilder.Name("Ints").DataType(Int32Type.Default).Nullable(true).Build());
StructType structType = new StructType(fields);
StringArray.Builder stringBuilder = new StringArray.Builder();
StringArray stringArray = stringBuilder.Append("joe").AppendNull().AppendNull().Append("mark").Build();
Int32Array.Builder intBuilder = new Int32Array.Builder();
Int32Array intArray = intBuilder.Append(1).Append(2).AppendNull().Append(4).Build();
List <Array> arrays = new List <Array>();
arrays.Add(stringArray);
arrays.Add(intArray);
ArrowBuffer.BitmapBuilder nullBitmap = new ArrowBuffer.BitmapBuilder();
var nullBitmapBuffer = nullBitmap.Append(true).Append(true).Append(false).Append(true).Build();
StructArray structs = new StructArray(structType, 4, arrays, nullBitmapBuffer, 1);
Assert.Equal(4, structs.Length);
Assert.Equal(1, structs.NullCount);
ArrayData[] childArrays = structs.Data.Children; // Data for StringArray and Int32Array
Assert.Equal(2, childArrays.Length);
for (int i = 0; i < childArrays.Length; i++)
{
ArrayData arrayData = childArrays[i];
Assert.Null(arrayData.Children);
if (i == 0)
{
Assert.Equal(ArrowTypeId.String, arrayData.DataType.TypeId);
Array array = new StringArray(arrayData);
StringArray structStringArray = array as StringArray;
Assert.NotNull(structStringArray);
Assert.Equal(structs.Length, structStringArray.Length);
Assert.Equal(stringArray.Length, structStringArray.Length);
Assert.Equal(stringArray.NullCount, structStringArray.NullCount);
for (int j = 0; j < stringArray.Length; j++)
{
Assert.Equal(stringArray.GetString(j), structStringArray.GetString(j));
}
}
if (i == 1)
{
Assert.Equal(ArrowTypeId.Int32, arrayData.DataType.TypeId);
Array array = new Int32Array(arrayData);
Int32Array structIntArray = array as Int32Array;
Assert.NotNull(structIntArray);
Assert.Equal(structs.Length, structIntArray.Length);
Assert.Equal(intArray.Length, structIntArray.Length);
Assert.Equal(intArray.NullCount, structIntArray.NullCount);
for (int j = 0; j < intArray.Length; j++)
{
Assert.Equal(intArray.GetValue(j), structIntArray.GetValue(j));
}
}
}
}
public static Func <int, T> GetGetter <T>(IArrowArray array)
{
if (array is null)
{
return(null);
}
// TODO: determine fastest way to read out a value from the array.
if (typeof(T) == typeof(bool))
{
var booleanArray = new BooleanArray(array.Data);
return((Func <int, T>)(object) new Func <int, bool>(
index => booleanArray.GetBoolean(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(bool?))
{
var booleanArray = new BooleanArray(array.Data);
return((Func <int, T>)(object) new Func <int, bool?>(booleanArray.GetBoolean));
}
if (typeof(T) == typeof(sbyte))
{
var int8Array = new Int8Array(array.Data);
return((Func <int, T>)(object) new Func <int, sbyte>(
index => int8Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(sbyte?))
{
var int8Array = new Int8Array(array.Data);
return((Func <int, T>)(object) new Func <int, sbyte?>(int8Array.GetValue));
}
if (typeof(T) == typeof(byte))
{
var uint8Array = new UInt8Array(array.Data);
return((Func <int, T>)(object) new Func <int, byte>(
index => uint8Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(byte?))
{
var uint8Array = new UInt8Array(array.Data);
return((Func <int, T>)(object) new Func <int, byte?>(uint8Array.GetValue));
}
if (typeof(T) == typeof(short))
{
var int16Array = new Int16Array(array.Data);
return((Func <int, T>)(object) new Func <int, short>(
index => int16Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(short?))
{
var int16Array = new Int16Array(array.Data);
return((Func <int, T>)(object) new Func <int, short?>(int16Array.GetValue));
}
if (typeof(T) == typeof(ushort))
{
var uint16Array = new UInt16Array(array.Data);
return((Func <int, T>)(object) new Func <int, ushort>(
index => uint16Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(ushort?))
{
var uint16Array = new UInt16Array(array.Data);
return((Func <int, T>)(object) new Func <int, ushort?>(uint16Array.GetValue));
}
if (typeof(T) == typeof(int))
{
var int32Array = new Int32Array(array.Data);
return((Func <int, T>)(object) new Func <int, int>(
index => int32Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(int?))
{
var int32Array = new Int32Array(array.Data);
return((Func <int, T>)(object) new Func <int, int?>(int32Array.GetValue));
}
if (typeof(T) == typeof(uint))
{
var uint32Array = new UInt32Array(array.Data);
return((Func <int, T>)(object) new Func <int, uint>(
index => uint32Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(uint?))
{
var uint32Array = new UInt32Array(array.Data);
return((Func <int, T>)(object) new Func <int, uint?>(uint32Array.GetValue));
}
if (typeof(T) == typeof(long))
{
var int64Array = new Int64Array(array.Data);
return((Func <int, T>)(object) new Func <int, long>(
index => int64Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(long?))
{
var int64Array = new Int64Array(array.Data);
return((Func <int, T>)(object) new Func <int, long?>(int64Array.GetValue));
}
if (typeof(T) == typeof(ulong))
{
var uint64Array = new UInt64Array(array.Data);
return((Func <int, T>)(object) new Func <int, ulong>(
index => uint64Array.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(ulong?))
{
var uint64Array = new UInt64Array(array.Data);
return((Func <int, T>)(object) new Func <int, ulong?>(uint64Array.GetValue));
}
if (typeof(T) == typeof(double))
{
var doubleArray = new DoubleArray(array.Data);
return((Func <int, T>)(object) new Func <int, double>(
index => doubleArray.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(double?))
{
var doubleArray = new DoubleArray(array.Data);
return((Func <int, T>)(object) new Func <int, double?>(doubleArray.GetValue));
}
if (typeof(T) == typeof(float))
{
var floatArray = new FloatArray(array.Data);
return((Func <int, T>)(object) new Func <int, float>(
index => floatArray.GetValue(index).GetValueOrDefault()));
}
if (typeof(T) == typeof(float?))
{
var floatArray = new FloatArray(array.Data);
return((Func <int, T>)(object) new Func <int, float?>(floatArray.GetValue));
}
if (typeof(T) == typeof(DateTime))
{
if (array.Data.DataType.TypeId == ArrowTypeId.Date32)
{
var date32Array = new Date32Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTime>(
index => date32Array.GetDate(index).GetValueOrDefault().DateTime));
}
else if (array.Data.DataType.TypeId == ArrowTypeId.Date64)
{
var date64Array = new Date64Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTime>(
index => date64Array.GetDate(index).GetValueOrDefault().DateTime));
}
}
if (typeof(T) == typeof(DateTime?))
{
if (array.Data.DataType.TypeId == ArrowTypeId.Date32)
{
var date32Array = new Date32Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTime?>(
index => date32Array.GetDate(index)?.DateTime));
}
else if (array.Data.DataType.TypeId == ArrowTypeId.Date64)
{
var date64Array = new Date64Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTime?>(
index => date64Array.GetDate(index)?.DateTime));
}
}
if (typeof(T) == typeof(DateTimeOffset))
{
if (array.Data.DataType.TypeId == ArrowTypeId.Date32)
{
var date32Array = new Date32Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTimeOffset>(
index => date32Array.GetDate(index).GetValueOrDefault()));
}
else if (array.Data.DataType.TypeId == ArrowTypeId.Date64)
{
var date64Array = new Date64Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTimeOffset>(
index => date64Array.GetDate(index).GetValueOrDefault()));
}
}
if (typeof(T) == typeof(DateTimeOffset?))
{
if (array.Data.DataType.TypeId == ArrowTypeId.Date32)
{
var date32Array = new Date32Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTimeOffset?>(
date32Array.GetDate));
}
else if (array.Data.DataType.TypeId == ArrowTypeId.Date64)
{
var date64Array = new Date64Array(array.Data);
return((Func <int, T>)(object) new Func <int, DateTimeOffset?>(
date64Array.GetDate));
}
}
if (typeof(T) == typeof(TimeSpan))
{
var timestampArray = new TimestampArray(array.Data);
return((Func <int, T>)(object) new Func <int, TimeSpan>(
index => timestampArray.GetTimestamp(index).GetValueOrDefault().TimeOfDay));
}
if (typeof(T) == typeof(TimeSpan?))
{
var timestampArray = new TimestampArray(array.Data);
return((Func <int, T>)(object) new Func <int, TimeSpan?>(
index => timestampArray.GetTimestamp(index)?.TimeOfDay));
}
if (typeof(T) == typeof(byte[]))
{
var binaryArray = new BinaryArray(array.Data);
return((Func <int, T>)(object) new Func <int, byte[]>(
// TODO: how to avoid this allocation/copy?
index => binaryArray.GetBytes(index).ToArray()));
}
if (typeof(T) == typeof(string))
{
var stringArray = new StringArray(array.Data);
return((Func <int, T>)(object) new Func <int, string>(
index => stringArray.GetString(index)));
}
// It's something else we don't yet support.
switch (array.Data.DataType.TypeId)
{
case ArrowTypeId.Decimal:
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:
case ArrowTypeId.Union:
default:
// TODO: support additional types?
throw new NotSupportedException(
$"Not supported array type: {array.Data.DataType.TypeId}");
}
}