Function getExpressionNodeResultTypeOrNull

src/Analyzer/Utils.cpp:322–348

}

DataTypePtr getExpressionNodeResultTypeOrNull(const QueryTreeNodePtr & query_tree_node)
{
    auto node_type = query_tree_node->getNodeType();

    switch (node_type)
    {
        case QueryTreeNodeType::CONSTANT:
            [[fallthrough]];
        case QueryTreeNodeType::COLUMN:
        {
            return query_tree_node->getResultType();
        }
        case QueryTreeNodeType::FUNCTION:
        {
            auto & function_node = query_tree_node->as<FunctionNode &>();
            if (function_node.isResolved())
                return function_node.getResultType();
            break;
        }
        default:
        {
            break;
        }
    }

    return nullptr;
}

QueryTreeNodePtr buildCastFunction(const QueryTreeNodePtr & expression,
    const DataTypePtr & type,