size_t
DRTupleStream::computeOffsets(TableTuple &tuple,
size_t *rowHeaderSz)
{
// round-up columncount to next multiple of 8 and divide by 8
const int columnCount = tuple.sizeInValues();
int nullMaskLength = ((columnCount + 7) & -8) >> 3;
// row header is 32-bit length of row plus null mask
*rowHeaderSz = sizeof(int32_t) + nullMaskLength;
//Can return 0 for a single column varchar with null
size_t dataSz = tuple.maxExportSerializationSize();
return *rowHeaderSz + dataSz;
}
// helper to make a schema, a tuple and calculate EL size
size_t
TableTupleExportTest::maxElSize(std::vector<uint16_t> &keep_offsets,
bool useNullStrings)
{
TableTuple *tt;
TupleSchema *ts;
char buf[1024]; // tuple data
ts = TupleSchema::createTupleSchema(m_schema, keep_offsets);
tt = new TableTuple(buf, ts);
// if the tuple includes strings, add some content
// assuming all Export tuples were allocated for persistent
// storage and choosing set* api accordingly here.
if (ts->columnCount() > 6) {
NValue nv = ValueFactory::getStringValue("ABCDEabcde"); // 10 char
if (useNullStrings)
{
nv.free(); nv.setNull();
}
tt->setNValueAllocateForObjectCopies(6, nv, NULL);
nv.free();
}
if (ts->columnCount() > 7) {
NValue nv = ValueFactory::getStringValue("abcdeabcdeabcdeabcde"); // 20 char
if (useNullStrings)
{
nv.free(); nv.setNull();
}
tt->setNValueAllocateForObjectCopies(7, nv, NULL);
nv.free();
}
// The function under test!
size_t sz = tt->maxExportSerializationSize();
// and cleanup
tt->freeObjectColumns();
delete tt;
TupleSchema::freeTupleSchema(ts);
return sz;
}
size_t
TupleStreamWrapper::computeOffsets(TableTuple &tuple,
size_t *rowHeaderSz)
{
// round-up columncount to next multiple of 8 and divide by 8
int columnCount = tuple.sizeInValues() + 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;
}