/*
* heap_compute_data_size
* Determine size of the data area of a tuple to be constructed
*/
Size
heap_compute_data_size(TupleDesc tupleDesc,
Datum *values,
bool *isnull)
{
Size data_length = 0;
int i;
int numberOfAttributes = tupleDesc->natts;
Form_pg_attribute *att = tupleDesc->attrs;
for (i = 0; i < numberOfAttributes; i++)
{
Datum val;
Form_pg_attribute atti;
if (isnull[i])
continue;
val = values[i];
atti = att[i];
if (ATT_IS_PACKABLE(atti) &&
VARATT_CAN_MAKE_SHORT(DatumGetPointer(val)))
{
/*
* we're anticipating converting to a short varlena header, so
* adjust length and don't count any alignment
*/
data_length += VARATT_CONVERTED_SHORT_SIZE(DatumGetPointer(val));
}
else if (atti->attlen == -1 &&
VARATT_IS_EXTERNAL_EXPANDED(DatumGetPointer(val)))
{
/*
* we want to flatten the expanded value so that the constructed
* tuple doesn't depend on it
*/
data_length = att_align_nominal(data_length, atti->attalign);
data_length += EOH_get_flat_size(DatumGetEOHP(val));
}
else
{
data_length = att_align_datum(data_length, atti->attalign,
atti->attlen, val);
data_length = att_addlength_datum(data_length, atti->attlen,
val);
}
}
return data_length;
}
/*
* heap_compute_data_size
* Determine size of the data area of a tuple to be constructed
*/
Size
heap_compute_data_size(TupleDesc tupleDesc,
Datum *values,
bool *isnull)
{
Size data_length = 0;
int i;
int numberOfAttributes = tupleDesc->natts;
Form_pg_attribute *att = tupleDesc->attrs;
for (i = 0; i < numberOfAttributes; i++)
{
Datum val;
if (isnull[i])
continue;
val = values[i];
if (ATT_IS_PACKABLE(att[i]) &&
VARATT_CAN_MAKE_SHORT(DatumGetPointer(val)))
{
/*
* we're anticipating converting to a short varlena header, so
* adjust length and don't count any alignment
*/
data_length += VARATT_CONVERTED_SHORT_SIZE(DatumGetPointer(val));
}
else
{
data_length = att_align_datum(data_length, att[i]->attalign,
att[i]->attlen, val);
data_length = att_addlength_datum(data_length, att[i]->attlen,
val);
}
}
return data_length;
}
