예제 #1
0
void DRTupleStream::writeRowTuple(TableTuple& tuple,
        size_t rowHeaderSz,
        size_t rowMetadataSz,
        const std::vector<int> *interestingColumns,
        const std::pair<const TableIndex*, uint32_t> &indexPair,
        ExportSerializeOutput &io) {
    size_t startPos = io.position();
    // initialize the full row header to 0. This also
    // has the effect of setting each column non-null.
    ::memset(m_currBlock->mutableDataPtr() + io.position(), 0, rowHeaderSz);
    // the nullarray lives in rowheader after the 4 byte header length prefix
    uint8_t *nullArray =
        reinterpret_cast<uint8_t*>(m_currBlock->mutableDataPtr() + io.position() + rowMetadataSz);

    // Reserve the row header by moving the position beyond the row header.
    // The row header includes the 4 byte length prefix and the null array.
    const size_t lengthPrefixPosition = io.reserveBytes(rowHeaderSz);

    tuple.serializeToDR(io, 0, nullArray, interestingColumns);

    ExportSerializeOutput hdr(m_currBlock->mutableDataPtr() + lengthPrefixPosition, rowMetadataSz);
    if (interestingColumns) {
        // add the row length and a crc of the index used to the header
        hdr.writeInt((int32_t)(io.position() - startPos - 2 * sizeof(int32_t)));
        hdr.writeInt(indexPair.second);
    } else {
        // add the row length to the header
        hdr.writeInt((int32_t)(io.position() - startPos - sizeof(int32_t)));
    }
}
void CompatibleDRTupleStream::writeRowTuple(TableTuple& tuple,
        size_t rowHeaderSz,
        size_t rowMetadataSz,
        ExportSerializeOutput &io) {
    size_t startPos = io.position();
    // initialize the full row header to 0. This also
    // has the effect of setting each column non-null.
    ::memset(m_currBlock->mutableDataPtr() + io.position(), 0, rowHeaderSz);
    // the nullarray lives in rowheader after the 4 byte header length prefix
    uint8_t *nullArray =
        reinterpret_cast<uint8_t*>(m_currBlock->mutableDataPtr() + io.position() + rowMetadataSz);

    // Reserve the row header by moving the position beyond the row header.
    // The row header includes the 4 byte length prefix and the null array.
    const size_t lengthPrefixPosition = io.reserveBytes(rowHeaderSz);

    tuple.serializeToDR(io, 0, nullArray);

    ExportSerializeOutput hdr(m_currBlock->mutableDataPtr() + lengthPrefixPosition, rowMetadataSz);
    // add the row length to the header
    hdr.writeInt((int32_t)(io.position() - startPos - sizeof(int32_t)));
}