Function ExecReScanUnique

src/backend/executor/nodeUnique.c:181–193

void
ExecReScanUnique(UniqueState *node)
{
	/* must clear result tuple so first input tuple is returned */
	ExecClearTuple(node->ps.ps_ResultTupleSlot);

	/*
	 * if chgParam of subnode is not null then plan will be re-scanned by
	 * first ExecProcNode.
	 */
	if (node->ps.lefttree->chgParam == NULL)
		ExecReScan(node->ps.lefttree);
}