Function par_plan_item

src/gpre/sqe.cpp:2386–2497

//

static gpre_nod* par_plan_item(gpre_req* request, bool /*aster_ok*/, USHORT* /*paren_count*/, bool* /*bool_flag*/)
{
	assert_IS_REQ(request);

	// check for a plan expression

	tok& token = gpreGlob.token_global;

	switch (token.tok_keyword)
	{
	case KW_JOIN:
	case KW_SORT:
	case KW_MERGE:
	case KW_LEFT_PAREN:
		return par_plan(request);
	}

	// parse the list of one or more table names or
	// aliases (more than one is used when there is
	// a need to differentiate base tables of a view)

	int count;
	gpre_lls* stack = NULL;
	for (count = 0; token.tok_type == tok_ident; count++)
	{
		if (token.tok_keyword == KW_NATURAL || token.tok_keyword == KW_ORDER ||
			token.tok_keyword == KW_INDEX)
		{
			break;
		}

		MSC_push((gpre_nod*) upcase_string(token.tok_string), &stack);
		PAR_get_token();
	}

	if (!count)
		CPR_s_error("<table name> or <alias>");

	gpre_nod** ptr;

	gpre_nod* alias_list = MSC_node(nod_list, (SSHORT) count);
	for (ptr = &alias_list->nod_arg[count]; stack;)
		*--ptr = (gpre_nod*) MSC_pop(&stack);

	// lookup the contexts for the aliases

	gpre_nod* index_list = NULL;
	gpre_ctx* context = par_alias_list(request, alias_list);

	// parse the access type

	gpre_nod* access_type = NULL;
	switch (token.tok_keyword)
	{
	case KW_NATURAL:
		access_type = MSC_node(nod_natural, 0);
		PAR_get_token();
		break;