Function par_primitive_value

src/gpre/sqe.cpp:2515–2689

//

static gpre_nod* par_primitive_value(gpre_req* request, bool aster_ok,
									 USHORT* paren_count, bool* bool_flag)
{
	USHORT local_count;

	assert_IS_REQ(request);

	gpre_nod* node = 0;

	if (!paren_count)
	{
		local_count = 0;
		paren_count = &local_count;
	}

	if (MSC_match(KW_SELECT))
		return par_stat(request);

	if (MSC_match(KW_MINUS))
		return MSC_unary(nod_negate, par_primitive_value(request, false, paren_count, NULL));

	MSC_match(KW_PLUS);

	if (MSC_match(KW_USER)) {
		return MSC_node(nod_user_name, 0);
	}

	if (MSC_match(KW_VALUE))
	{
		// If request is NULL we must be processing a subquery - and
		// without the request to refer to we're kinda hosed

		if (!request)
			PAR_error("VALUE cannot be used in this context");
		const act* action = request->req_actions;
		if (request->req_type != REQ_ddl || !action ||
			!(action->act_type == ACT_create_domain || action->act_type == ACT_alter_domain))
		{
			PAR_error("VALUE cannot be used in this context");
		}

		return MSC_node(nod_dom_value, 0);
	}

	if (MSC_match(KW_LEFT_PAREN))
	{
		(*paren_count)++;
		if (bool_flag && *bool_flag)
			node = SQE_boolean(request, paren_count);
		else
			node = SQE_value(request, false, paren_count, bool_flag);
		EXP_match_paren();
		(*paren_count)--;
		return node;
	}

	// Check for an aggregate statistical expression.  If we already have a
	// map defined for the request, we're part of either HAVING or a trailing