bool Tile::SerializeHeaderTo(SerializeOutput &output) {
std::size_t start;
// Use the cache if possible
if (column_header != NULL) {
PL_ASSERT(column_header_size != INVALID_OID);
output.WriteBytes(column_header, column_header_size);
return true;
}
PL_ASSERT(column_header_size == INVALID_OID);
// Skip header position
start = output.Position();
output.WriteInt(-1);
// Status code
output.WriteByte(-128);
// Column counts as a short
output.WriteShort(static_cast<int16_t>(column_count));
// Write an array of column types as bytes
for (oid_t column_itr = 0; column_itr < column_count; ++column_itr) {
type::Type::TypeId type = schema.GetType(column_itr);
output.WriteByte(static_cast<int8_t>(type));
}
// Write the array of column names as strings
// NOTE: strings are ASCII only in metadata (UTF-8 in table storage)
for (oid_t column_itr = 0; column_itr < column_count; ++column_itr) {
// Column name: Write (offset, length) for column definition, and string to
// string table
const std::string &name = GetColumnName(column_itr);
// Column names can't be null, so length must be >= 0
int32_t length = static_cast<int32_t>(name.size());
PL_ASSERT(length >= 0);
// this is standard string serialization for voltdb
output.WriteInt(length);
output.WriteBytes(name.data(), length);
}
// Write the header size which is a non-inclusive int
size_t Position = output.Position();
column_header_size = static_cast<int32_t>(Position - start);
int32_t non_inclusive_header_size =
static_cast<int32_t>(column_header_size - sizeof(int32_t));
output.WriteIntAt(start, non_inclusive_header_size);
// Cache the column header
column_header = new char[column_header_size];
PL_MEMCPY(column_header, static_cast<const char *>(output.Data()) + start,
column_header_size);
return true;
}
void VarlenType::SerializeTo(const Value &val, SerializeOutput &out) const {
uint32_t len = GetLength(val);
out.WriteInt(len);
if (len > 0 && len < PELOTON_VALUE_NULL) {
out.WriteBytes(val.GetData(), len);
}
}