Function buildTableExpressionsStackImpl

src/Analyzer/Utils.cpp:748–797

{

void buildTableExpressionsStackImpl(const QueryTreeNodePtr & join_tree_node, QueryTreeNodes & result)
{
    auto node_type = join_tree_node->getNodeType();

    switch (node_type)
    {
        case QueryTreeNodeType::TABLE:
            [[fallthrough]];
        case QueryTreeNodeType::QUERY:
            [[fallthrough]];
        case QueryTreeNodeType::UNION:
            [[fallthrough]];
        case QueryTreeNodeType::TABLE_FUNCTION:
        {
            result.push_back(join_tree_node);
            break;
        }
        case QueryTreeNodeType::ARRAY_JOIN:
        {
            auto & array_join_node = join_tree_node->as<ArrayJoinNode &>();
            buildTableExpressionsStackImpl(array_join_node.getTableExpression(), result);
            result.push_back(join_tree_node);
            break;
        }
        case QueryTreeNodeType::CROSS_JOIN:
        {
            auto & cross_join_node = join_tree_node->as<CrossJoinNode &>();

            for (const auto & expr : cross_join_node.getTableExpressions())
                buildTableExpressionsStackImpl(expr, result);

            result.push_back(join_tree_node);
            break;
        }
        case QueryTreeNodeType::JOIN:
        {
            auto & join_node = join_tree_node->as<JoinNode &>();
            buildTableExpressionsStackImpl(join_node.getLeftTableExpression(), result);
            buildTableExpressionsStackImpl(join_node.getRightTableExpression(), result);
            result.push_back(join_tree_node);
            break;
        }
        default:
        {
            throw Exception(ErrorCodes::LOGICAL_ERROR,
                "Unexpected node type for table expression. Expected table, table function, query, union, join or array join. Actual {}",
                join_tree_node->getNodeTypeName());
        }
    }
}

}