Function IDX_modify_flag_uk_modified

src/jrd/idx.cpp:1436–1496

void IDX_modify_flag_uk_modified(thread_db* tdbb,
								 record_param* org_rpb,
								 record_param* new_rpb,
								 jrd_tra* transaction)
{
/**************************************
 *
 *	I D X _ m o d i f y _ f l a g _ u k _ m o d i f i e d
 *
 **************************************
 *
 * Functional description
 *	Set record flag if key field value was changed by this update or
 *  if this is second update of this record in the same transaction and
 *  flag is already set by one of the previous update.
 *
 **************************************/

	SET_TDBB(tdbb);

	if ((org_rpb->rpb_flags & rpb_uk_modified) &&
		(org_rpb->rpb_transaction_nr == new_rpb->rpb_transaction_nr))
	{
		new_rpb->rpb_flags |= rpb_uk_modified;
		return;
	}

	jrd_rel* const relation = org_rpb->rpb_relation;
	fb_assert(new_rpb->rpb_relation == relation);

	RelationPages* const relPages = relation->getPages(tdbb);
	WIN window(relPages->rel_pg_space_id, -1);

	DSC desc1, desc2;
	index_desc idx;
	idx.idx_id = idx_invalid;

	while (BTR_next_index(tdbb, relation, transaction, &idx, &window))
	{
		if (!(idx.idx_flags & (idx_primary | idx_unique)) ||
			!MET_lookup_partner(tdbb, relation, &idx, 0))
		{
			continue;
		}

		for (USHORT i = 0; i < idx.idx_count; i++)
		{
			const USHORT field_id = idx.idx_rpt[i].idx_field;

			const bool flag_org = EVL_field(relation, org_rpb->rpb_record, field_id, &desc1);
			const bool flag_new = EVL_field(relation, new_rpb->rpb_record, field_id, &desc2);

			if (flag_org != flag_new || (flag_new && MOV_compare(tdbb, &desc1, &desc2)))
			{
				new_rpb->rpb_flags |= rpb_uk_modified;
				CCH_RELEASE(tdbb, &window);
				return;
			}