presto-main/src/main/java/io/prestosql/sql/analyzer/StatementAnalyzer.java/StatementAnalyzer/createAndAssignScope
class StatementAnalyzer:        private Scope createAndAssignScope(Node node, Optional<Scope> parentScope, List<Field> fields)
        {
            return createAndAssignScope(node, parentScope, new RelationType(fields));
        }