Function ExecBuildAuxRowMark

src/backend/executor/execMain.c:3551–3590

* ExecBuildAuxRowMark -- create an ExecAuxRowMark struct * * Inputs are the underlying ExecRowMark struct and the targetlist of the * input plan node (not planstate node!). We need the latter to find out * the column numbers of the resjunk columns. */

 * the column numbers of the resjunk columns.
 */
ExecAuxRowMark *
ExecBuildAuxRowMark(ExecRowMark *erm, List *targetlist)
{
	ExecAuxRowMark *aerm = (ExecAuxRowMark *) palloc0(sizeof(ExecAuxRowMark));
	char		resname[32];

	aerm->rowmark = erm;

	/* Look up the resjunk columns associated with this rowmark */
	if (erm->markType != ROW_MARK_COPY)
	{
		/* need ctid for all methods other than COPY */
		snprintf(resname, sizeof(resname), "ctid%u", erm->rowmarkId);
		aerm->ctidAttNo = ExecFindJunkAttributeInTlist(targetlist,
													   resname);
		if (!AttributeNumberIsValid(aerm->ctidAttNo))
			elog(ERROR, "could not find junk %s column", resname);
	}
	else
	{
		/* need wholerow if COPY */
		snprintf(resname, sizeof(resname), "wholerow%u", erm->rowmarkId);
		aerm->wholeAttNo = ExecFindJunkAttributeInTlist(targetlist,
														resname);
		if (!AttributeNumberIsValid(aerm->wholeAttNo))
			elog(ERROR, "could not find junk %s column", resname);
	}

	/* if child rel, need tableoid */
	if (erm->rti != erm->prti)
	{
		snprintf(resname, sizeof(resname), "tableoid%u", erm->rowmarkId);
		aerm->toidAttNo = ExecFindJunkAttributeInTlist(targetlist,
													   resname);
		if (!AttributeNumberIsValid(aerm->toidAttNo))
			elog(ERROR, "could not find junk %s column", resname);
	}

	return aerm;
}


/*