Function check_partner_index

src/jrd/idx.cpp:1868–1996

static idx_e check_partner_index(thread_db* tdbb,
								 jrd_rel* relation,
								 Record* record,
								 jrd_tra* transaction,
								 index_desc* idx,
								 jrd_rel* partner_relation,
								 USHORT index_id)
{
/**************************************
 *
 *	c h e c k _ p a r t n e r _ i n d e x
 *
 **************************************
 *
 * Functional description
 *	The passed index participates in a foreign key.
 *	Check the passed record to see if a corresponding
 *	record appears in the partner index.
 *
 **************************************/
	SET_TDBB(tdbb);

	// get the index root page for the partner relation

	WIN window(get_root_page(tdbb, partner_relation));
	index_root_page* root = (index_root_page*) CCH_FETCH(tdbb, &window, LCK_read, pag_root);

	// get the description of the partner index

	index_desc partner_idx;
	if (!BTR_description(tdbb, partner_relation, root, &partner_idx, index_id))
	{
		CCH_RELEASE(tdbb, &window);
		BUGCHECK(175);			// msg 175 partner index description not found
	}

	fb_assert(!(idx->idx_flags & idx_condition));
	fb_assert(!(partner_idx.idx_flags & idx_condition));

	bool starting = false;
	USHORT segment;

	if (!(partner_idx.idx_flags & idx_unique))
	{
		const index_desc::idx_repeat* idx_desc = partner_idx.idx_rpt;
		for (segment = 0; segment < partner_idx.idx_count; ++segment, ++idx_desc)
		{
			if (idx_desc->idx_itype >= idx_first_intl_string)
			{
				TextType* textType = INTL_texttype_lookup(tdbb, INTL_INDEX_TO_TEXT(idx_desc->idx_itype));

				if (textType->getFlags() & TEXTTYPE_SEPARATE_UNIQUE)
				{
					starting = true;
					++segment;
					break;
				}
			}