presto-main/src/main/java/io/prestosql/sql/planner/ExpressionInterpreter.java/ExpressionInterpreter/visitExpression
class ExpressionInterpreter:        @Override
        protected Object visitExpression(Expression node, Object context)
        {
            throw new PrestoException(NOT_SUPPORTED, "not yet implemented: " + node.getClass().getName());
        }