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概要 †

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引数 †

  1. tupleDesc : TupleDesc型
  2. values : Datum型へのポインタ
  3. isnull : bool型へのポインタ
  4. data : char型へのポインタ
  5. infomask : uint16型へのポインタ
  6. bit : bits8型へのポインタ
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実装 †

void heap_fill_tuple(TupleDesc tupleDesc,

				Datum *values,
				bool *isnull,
				char *data, 
				uint16 *infomask, 
				bits8 *bit)

{

	bits8	   *bitP;
	int			bitmask;
	int			i;
	int			numberOfAttributes = tupleDesc->natts;
	Form_pg_attribute *att = tupleDesc->attrs;
	if (bit != NULL)
	{
		bitP = &bit[-1];
		bitmask = CSIGNBIT;
	}
	else
	{
		/* just to keep compiler quiet */
		bitP = NULL;
		bitmask = 0;
	}
	*infomask &= ~(HEAP_HASNULL | HEAP_HASVARWIDTH | HEAP_HASEXTENDED);
	for (i = 0; i < numberOfAttributes; i++)
	{
		Size		data_length;
		if (bit != NULL)
		{
			if (bitmask != CSIGNBIT)
				bitmask <<= 1;
			else
			{
				bitP += 1;
				*bitP = 0x0;
				bitmask = 1;
			}
			if (isnull[i])
			{
				*infomask |= HEAP_HASNULL;
				continue;
			}
			*bitP |= bitmask;
		}
		/* XXX we are aligning the pointer itself, not the offset */
		data = (char *) att_align((long) data, att[i]->attalign);
		if (att[i]->attbyval)
		{
			/* pass-by-value */
			store_att_byval(data, values[i], att[i]->attlen);
			data_length = att[i]->attlen;
		}
		else if (att[i]->attlen == -1)
		{
			/* varlena */
			*infomask |= HEAP_HASVARWIDTH;
			if (VARATT_IS_EXTERNAL(values[i]))
				*infomask |= HEAP_HASEXTERNAL;
			if (VARATT_IS_COMPRESSED(values[i]))
				*infomask |= HEAP_HASCOMPRESSED;
			data_length = VARATT_SIZE(DatumGetPointer(values[i]));
			memcpy(data, DatumGetPointer(values[i]), data_length);
		}
		else if (att[i]->attlen == -2)
		{
			/* cstring */
			*infomask |= HEAP_HASVARWIDTH;
			data_length = strlen(DatumGetCString(values[i])) + 1;
			memcpy(data, DatumGetPointer(values[i]), data_length);
		}
		else
		{
			/* fixed-length pass-by-reference */
			Assert(att[i]->attlen > 0);
			data_length = att[i]->attlen;
			memcpy(data, DatumGetPointer(values[i]), data_length);
		}
		data += data_length;
	}

}

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呼出元 †

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備考 †

* heap_fill_tuple
*		Load data portion of a tuple from values/isnull arrays
*
* We also fill the null bitmap (if any) and set the infomask bits
* that reflect the tuple's data contents.
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履歴 †

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コメント †


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