internal void Init(
ArrayPoolBuffer <byte> messageBuffer,
int messageProtobufLength,
SidecarOffset[] sidecarOffsets)
{
_messageBuffer = messageBuffer;
_messageProtobufLength = messageProtobufLength;
_sidecarOffsets = sidecarOffsets;
}
public static Buffer <T> Create(ArrayPool <T> pool, int minimumLength, out IDisposable disposable)
{
if (pool == null)
{
throw new ArgumentNullException(nameof(pool));
}
if (minimumLength <= 0)
{
throw new ArgumentOutOfRangeException(nameof(minimumLength));
}
var buffer = new ArrayPoolBuffer(0, pool, minimumLength);
disposable = buffer;
return(buffer);
}
public override OwnedMemory <byte> Rent(int minimumBufferSize)
{
var buffer = new ArrayPoolBuffer(minimumBufferSize);
return(buffer);
}
// Used to convert the rowwise data to the newer columnar format,
// to avoid virtual calls on ResultSet.
// This is only used if the Kudu server is 1.11 or older.
public static ResultSet Convert(
KuduMessage message,
KuduSchema schema,
RowwiseRowBlockPB rowPb)
{
var numColumns = schema.Columns.Count;
int columnOffsetsSize = numColumns;
if (schema.HasNullableColumns)
{
columnOffsetsSize++;
}
var columnOffsets = new int[columnOffsetsSize];
int currentOffset = 0;
columnOffsets[0] = currentOffset;
// Pre-compute the columns offsets in rowData for easier lookups later.
// If the schema has nullables, we also add the offset for the null bitmap at the end.
for (int i = 1; i < columnOffsetsSize; i++)
{
ColumnSchema column = schema.GetColumn(i - 1);
int previousSize = column.Size;
columnOffsets[i] = previousSize + currentOffset;
currentOffset += previousSize;
}
var rowData = GetRowData(message, rowPb);
var indirectData = GetIndirectData(message, rowPb);
int nonNullBitmapOffset = columnOffsets[columnOffsets.Length - 1];
int rowSize = schema.RowSize;
int numRows = rowPb.NumRows;
var dataSidecarOffsets = new SidecarOffset[numColumns];
var varlenDataSidecarOffsets = new SidecarOffset[numColumns];
var nonNullBitmapSidecarOffsets = new SidecarOffset[numColumns];
int nonNullBitmapSize = KuduEncoder.BitsToBytes(numRows);
int offset = 0;
for (int i = 0; i < numColumns; i++)
{
var column = schema.GetColumn(i);
var dataSize = column.IsFixedSize
? column.Size * numRows
: (4 * numRows) + 4;
dataSidecarOffsets[i] = new SidecarOffset(offset, dataSize);
offset += dataSize;
if (column.IsNullable)
{
nonNullBitmapSidecarOffsets[i] = new SidecarOffset(offset, nonNullBitmapSize);
offset += nonNullBitmapSize;
}
else
{
nonNullBitmapSidecarOffsets[i] = new SidecarOffset(-1, 0);
}
}
var buffer = new ArrayPoolBuffer <byte>(offset + indirectData.Length);
var data = buffer.Buffer;
data.AsSpan().Clear();
var varlenData = data.AsSpan(offset);
int currentDataOffset = 0;
int currentVarlenOffset = 0;
for (int columnIndex = 0; columnIndex < numColumns; columnIndex++)
{
var column = schema.GetColumn(columnIndex);
var isFixedSize = column.IsFixedSize;
var columnarSize = isFixedSize ? column.Size : 4;
var rowwiseSize = column.Size;
var dataOffset = dataSidecarOffsets[columnIndex];
var nonNullOffset = nonNullBitmapSidecarOffsets[columnIndex].Start;
var dataOutput = data.AsSpan(dataOffset.Start, dataOffset.Length);
for (int rowIndex = 0; rowIndex < numRows; rowIndex++)
{
bool isSet = true;
var rowSlice = rowData.Slice(rowSize * rowIndex, rowSize);
if (nonNullOffset > 0)
{
isSet = !rowSlice.GetBit(nonNullBitmapOffset, columnIndex);
if (isSet)
{
data.SetBit(nonNullOffset, rowIndex);
}
}
if (isSet)
{
if (isFixedSize)
{
var rawData = rowSlice.Slice(currentDataOffset, columnarSize);
rawData.CopyTo(dataOutput);
}
else
{
var offsetData = rowSlice.Slice(currentDataOffset, 8);
var lengthData = rowSlice.Slice(currentDataOffset + 8, 8);
int start = (int)KuduEncoder.DecodeInt64(offsetData);
int length = (int)KuduEncoder.DecodeInt64(lengthData);
var indirectSlice = indirectData.Slice(start, length);
indirectSlice.CopyTo(varlenData);
varlenData = varlenData.Slice(length);
KuduEncoder.EncodeInt32(dataOutput, currentVarlenOffset);
currentVarlenOffset += length;
}
}
dataOutput = dataOutput.Slice(columnarSize);
}
currentDataOffset += rowwiseSize;
if (!isFixedSize)
{
KuduEncoder.EncodeInt32(dataOutput, currentVarlenOffset);
varlenDataSidecarOffsets[columnIndex] = new SidecarOffset(offset, currentVarlenOffset);
offset += currentVarlenOffset;
currentVarlenOffset = 0;
}
}
return(new ResultSet(
buffer,
schema,
numRows,
dataSidecarOffsets,
varlenDataSidecarOffsets,
nonNullBitmapSidecarOffsets));
}
