bool Table::checkNulls(TableTuple& tuple) const {
assert (m_columnCount == tuple.columnCount());
for (int i = m_columnCount - 1; i >= 0; --i) {
if (( ! m_allowNulls[i]) && tuple.isNull(i)) {
VOLT_TRACE ("%d th attribute was NULL. It is non-nillable attribute.", i);
return false;
}
}
return true;
}
/**
* Iterate through the table blocks until all the active tuples have been found. Skip dirty tuples
* and mark them as clean so that they can be copied during the next snapshot.
*/
bool CopyOnWriteIterator::next(TableTuple &out) {
if (m_currentBlock == NULL) {
return false;
}
while (true) {
if (m_blockOffset >= m_currentBlock->unusedTupleBoundary()) {
if (m_blockIterator == m_end) {
m_surgeon->snapshotFinishedScanningBlock(m_currentBlock, TBPtr());
break;
}
m_surgeon->snapshotFinishedScanningBlock(m_currentBlock, m_blockIterator.data());
char *finishedBlock = m_currentBlock->address();
m_location = m_blockIterator.key();
m_currentBlock = m_blockIterator.data();
assert(m_currentBlock->address() == m_location);
m_blockOffset = 0;
// Remove the finished block from the map so that it can be released
// back to the OS if all tuples in the block is deleted.
//
// This invalidates the iterators, so we have to get new iterators
// using the current block's start address. m_blockIterator has to
// point to the next block, hence the upper_bound() call.
m_blocks.erase(finishedBlock);
m_blockIterator = m_blocks.upper_bound(m_currentBlock->address());
m_end = m_blocks.end();
}
assert(m_location < m_currentBlock.get()->address() + m_table->getTableAllocationSize());
assert(m_location < m_currentBlock.get()->address() + (m_table->getTupleLength() * m_table->getTuplesPerBlock()));
assert (out.columnCount() == m_table->columnCount());
m_blockOffset++;
out.move(m_location);
const bool active = out.isActive();
const bool dirty = out.isDirty();
if (dirty) m_skippedDirtyRows++;
if (!active) m_skippedInactiveRows++;
// Return this tuple only when this tuple is not marked as deleted and isn't dirty
if (active && !dirty) {
out.setDirtyFalse();
m_location += m_tupleLength;
return true;
} else {
out.setDirtyFalse();
m_location += m_tupleLength;
}
}
return false;
}
size_t
ExportTupleStream::computeOffsets(TableTuple &tuple,
size_t *rowHeaderSz)
{
// round-up columncount to next multiple of 8 and divide by 8
int columnCount = tuple.columnCount() + METADATA_COL_CNT;
int nullMaskLength = ((columnCount + 7) & -8) >> 3;
// row header is 32-bit length of row plus null mask
*rowHeaderSz = sizeof (int32_t) + nullMaskLength;
// metadata column width: 5 int64_ts plus CHAR(1).
size_t metadataSz = (sizeof (int64_t) * 5) + 1;
// returns 0 if corrupt tuple detected
size_t dataSz = tuple.maxExportSerializationSize();
if (dataSz == 0) {
throwFatalException("Invalid tuple passed to computeTupleMaxLength. Crashing System.");
}
return *rowHeaderSz + metadataSz + dataSz;
}
