diff --git a/cozo-rocks/src/lib.rs b/cozo-rocks/src/lib.rs
index dbc106fe..326c1d63 100644
--- a/cozo-rocks/src/lib.rs
+++ b/cozo-rocks/src/lib.rs
@@ -318,6 +318,10 @@ pub struct DB {
     pub default_write_options: WriteOptions,
 }
 
+unsafe impl Send for DB {}
+
+unsafe impl Sync for DB {}
+
 pub trait DBImpl {
     fn open(options: Options, path: &Path) -> Result<DB>;
     fn get_cf_handle(&self, name: impl AsRef<str>) -> Result<ColumnFamilyHandle>;
diff --git a/src/ast.rs b/src/ast.rs
index 9a94db5a..85df0d32 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -1,3 +1,4 @@
+use std::sync::Arc;
 use pest::iterators::{Pair};
 use pest::Parser as PestParser;
 use pest::prec_climber::{Assoc, PrecClimber, Operator};
@@ -59,6 +60,7 @@ pub enum Expr<'a> {
     List(Vec<Expr<'a>>),
     Dict(Vec<String>, Vec<Expr<'a>>),
     Apply(Op, Vec<Expr<'a>>),
+    Ident(String),
     Const(Value<'a>),
 }
 
@@ -192,7 +194,7 @@ fn build_expr_primary(pair: Pair<Rule>) -> Result<Expr> {
         Rule::null => Ok(Const(Value::Null)),
         Rule::boolean => Ok(Const(Value::Bool(pair.as_str() == "true"))),
         Rule::quoted_string | Rule::s_quoted_string | Rule::raw_string => Ok(
-            Const(Value::OwnString(Box::new(parse_string(pair)?)))),
+            Const(Value::OwnString(Arc::new(parse_string(pair)?)))),
         Rule::list => {
             let mut vals = vec![];
             let mut has_apply = false;
@@ -209,12 +211,13 @@ fn build_expr_primary(pair: Pair<Rule>) -> Result<Expr> {
             if has_apply {
                 Ok(Expr::List(vals))
             } else {
-                Ok(Const(Value::List(Box::new(vals.into_iter().map(|v| {
+                Ok(Const(Value::List(Arc::new(vals.into_iter().map(|v| {
                     match v {
                         Apply(_, _) => { unreachable!() }
                         Expr::List(_) => { unreachable!() }
                         Expr::Dict(_, _) => { unreachable!() }
                         Const(v) => { v }
+                        Expr::Ident(_) => unimplemented!()
                     }
                 }).collect()))))
             }
@@ -246,7 +249,7 @@ fn build_expr_primary(pair: Pair<Rule>) -> Result<Expr> {
             if has_apply {
                 Ok(Expr::Dict(keys, vals))
             } else {
-                Ok(Const(Value::Dict(Box::new(keys.into_iter().zip(vals.into_iter()).map(|(k, v)| {
+                Ok(Const(Value::Dict(Arc::new(keys.into_iter().zip(vals.into_iter()).map(|(k, v)| {
                     match v {
                         Expr::List(_) => { unreachable!() }
                         Expr::Dict(_, _) => { unreachable!() }
@@ -254,10 +257,14 @@ fn build_expr_primary(pair: Pair<Rule>) -> Result<Expr> {
                         Const(v) => {
                             (k.into(), v)
                         }
+                        Expr::Ident(_) => unimplemented!()
                     }
                 }).collect()))))
             }
         }
+        Rule::param => {
+            Ok(Expr::Ident(pair.as_str().to_string()))
+        }
         _ => {
             println!("Unhandled rule {:?}", pair.as_rule());
             unimplemented!()
@@ -265,7 +272,7 @@ fn build_expr_primary(pair: Pair<Rule>) -> Result<Expr> {
     }
 }
 
-fn build_expr(pair: Pair<Rule>) -> Result<Expr> {
+pub fn build_expr(pair: Pair<Rule>) -> Result<Expr> {
     PREC_CLIMBER.climb(pair.into_inner(), build_expr_primary, build_expr_infix)
 }
 
diff --git a/src/definition.rs b/src/definition.rs
index c18f2196..15f2f4c4 100644
--- a/src/definition.rs
+++ b/src/definition.rs
@@ -1,4 +1,5 @@
 use std::collections::BTreeMap;
+use std::sync::Arc;
 use pest::iterators::{Pair, Pairs};
 use crate::ast::parse_string;
 use crate::env::{Env, LayeredEnv, StructuredEnvItem};
@@ -304,19 +305,20 @@ impl RocksStorage {
             let mut key_parser = ByteArrayParser::new(&k);
             let mut data_parser = ByteArrayParser::new(&v);
             key_parser.parse_varint().unwrap();
-            let table_name = key_parser.parse_value().unwrap().get_string().unwrap();
+            let table_name = key_parser.parse_value().unwrap().get_string().unwrap().to_string();
             let table_kind = data_parser.parse_value().unwrap();
             let table_id = TableId { name: table_name, local_id: 0 };
 
             match table_kind {
                 Value::UInt(i) if i == TableKind::Node as u64 => {
                     let keys: Vec<_> = data_parser.parse_value().unwrap().get_list().unwrap()
-                        .into_iter().map(|v| {
-                        let mut vs = v.get_list().unwrap().into_iter();
-                        let name = vs.next().unwrap().get_string().unwrap();
+                        .iter().map(|v| {
+                        let vs = v.get_list().unwrap();
+                        let mut vs = vs.iter();
+                        let name = vs.next().unwrap().get_string().unwrap().to_string();
                         let typ = vs.next().unwrap().get_string().unwrap();
                         let typ = env.build_type_from_str(&typ).unwrap();
-                        let default = vs.next().unwrap().into_owned();
+                        let default = vs.next().unwrap().to_owned();
                         Col {
                             name,
                             typ,
@@ -324,12 +326,13 @@ impl RocksStorage {
                         }
                     }).collect();
                     let cols: Vec<_> = data_parser.parse_value().unwrap().get_list().unwrap()
-                        .into_iter().map(|v| {
-                        let mut vs = v.get_list().unwrap().into_iter();
-                        let name = vs.next().unwrap().get_string().unwrap();
+                        .iter().map(|v| {
+                        let vs = v.get_list().unwrap();
+                        let mut vs = vs.iter();
+                        let name = vs.next().unwrap().get_string().unwrap().to_string();
                         let typ = vs.next().unwrap().get_string().unwrap();
                         let typ = env.build_type_from_str(&typ).unwrap();
-                        let default = vs.next().unwrap().into_owned();
+                        let default = vs.next().unwrap().to_owned();
                         Col {
                             name,
                             typ,
@@ -348,17 +351,18 @@ impl RocksStorage {
                     ret.push(Structured::Node(node));
                 }
                 Value::UInt(i) if i == TableKind::Edge as u64 => {
-                    let src_name = data_parser.parse_value().unwrap().get_string().unwrap();
-                    let dst_name = data_parser.parse_value().unwrap().get_string().unwrap();
+                    let src_name = data_parser.parse_value().unwrap().get_string().unwrap().to_string();
+                    let dst_name = data_parser.parse_value().unwrap().get_string().unwrap().to_string();
                     let src_id = TableId { name: src_name, local_id: 0 };
                     let dst_id = TableId { name: dst_name, local_id: 0 };
                     let keys: Vec<_> = data_parser.parse_value().unwrap().get_list().unwrap()
-                        .into_iter().map(|v| {
-                        let mut vs = v.get_list().unwrap().into_iter();
-                        let name = vs.next().unwrap().get_string().unwrap();
+                        .iter().map(|v| {
+                        let vs = v.get_list().unwrap();
+                        let mut vs = vs.iter();
+                        let name = vs.next().unwrap().get_string().unwrap().to_string();
                         let typ = vs.next().unwrap().get_string().unwrap();
                         let typ = env.build_type_from_str(&typ).unwrap();
-                        let default = vs.next().unwrap().into_owned();
+                        let default = vs.next().unwrap().to_owned();
                         Col {
                             name,
                             typ,
@@ -366,12 +370,13 @@ impl RocksStorage {
                         }
                     }).collect();
                     let cols: Vec<_> = data_parser.parse_value().unwrap().get_list().unwrap()
-                        .into_iter().map(|v| {
-                        let mut vs = v.get_list().unwrap().into_iter();
-                        let name = vs.next().unwrap().get_string().unwrap();
+                        .iter().map(|v| {
+                        let vs = v.get_list().unwrap();
+                        let mut vs = vs.iter();
+                        let name = vs.next().unwrap().get_string().unwrap().to_string();
                         let typ = vs.next().unwrap().get_string().unwrap();
                         let typ = env.build_type_from_str(&typ).unwrap();
-                        let default = vs.next().unwrap().into_owned();
+                        let default = vs.next().unwrap().to_owned();
                         Col {
                             name,
                             typ,
@@ -408,17 +413,17 @@ impl RocksStorage {
         key_writer.build_value(&Value::RefString(&node.id.name));
         let mut val_writer = ByteArrayBuilder::with_capacity(128);
         val_writer.build_value(&Value::UInt(TableKind::Node as u64));
-        val_writer.build_value(&Value::List(Box::new(node.keys.iter().map(|k| {
-            Value::List(Box::new(vec![
+        val_writer.build_value(&Value::List(Arc::new(node.keys.iter().map(|k| {
+            Value::List(Arc::new(vec![
                 Value::RefString(&k.name),
-                Value::OwnString(Box::new(format!("{}", k.typ))),
+                Value::OwnString(Arc::new(format!("{}", k.typ))),
                 k.default.clone(),
             ]))
         }).collect())));
-        val_writer.build_value(&Value::List(Box::new(node.cols.iter().map(|k| {
-            Value::List(Box::new(vec![
+        val_writer.build_value(&Value::List(Arc::new(node.cols.iter().map(|k| {
+            Value::List(Arc::new(vec![
                 Value::RefString(&k.name),
-                Value::OwnString(Box::new(format!("{}", k.typ))),
+                Value::OwnString(Arc::new(format!("{}", k.typ))),
                 k.default.clone(),
             ]))
         }).collect())));
@@ -437,17 +442,17 @@ impl RocksStorage {
         val_writer.build_value(&Value::UInt(TableKind::Edge as u64));
         val_writer.build_value(&Value::RefString(&edge.src.name));
         val_writer.build_value(&Value::RefString(&edge.dst.name));
-        val_writer.build_value(&Value::List(Box::new(edge.keys.iter().map(|k| {
-            Value::List(Box::new(vec![
+        val_writer.build_value(&Value::List(Arc::new(edge.keys.iter().map(|k| {
+            Value::List(Arc::new(vec![
                 Value::RefString(&k.name),
-                Value::OwnString(Box::new(format!("{}", k.typ))),
+                Value::OwnString(Arc::new(format!("{}", k.typ))),
                 k.default.clone(),
             ]))
         }).collect())));
-        val_writer.build_value(&Value::List(Box::new(edge.cols.iter().map(|k| {
-            Value::List(Box::new(vec![
+        val_writer.build_value(&Value::List(Arc::new(edge.cols.iter().map(|k| {
+            Value::List(Arc::new(vec![
                 Value::RefString(&k.name),
-                Value::OwnString(Box::new(format!("{}", k.typ))),
+                Value::OwnString(Arc::new(format!("{}", k.typ))),
                 k.default.clone(),
             ]))
         }).collect())));
@@ -460,26 +465,27 @@ impl RocksStorage {
 
 impl Evaluator<RocksStorage> {
     pub fn restore_metadata(&mut self) -> Result<()> {
-        let mds = self.storage.all_metadata(self.s_envs.root())?;
+        let mds = self.storage.all_metadata(self.env.root())?;
         for md in &mds {
             match md {
                 v @ Structured::Node(n) => {
                     // TODO: check if they are the same if one already exists
-                    self.s_envs.root_define(n.id.name.clone(), v.clone());
+                    self.env.root_define(n.id.name.clone(), v.clone());
                 }
                 v @ Structured::Edge(e) => {
-                    self.s_envs.root_define(e.id.name.clone(), v.clone());
+                    self.env.root_define(e.id.name.clone(), v.clone());
                 }
                 Structured::Columns(_) => {}
                 Structured::Index(_) => {}
-                Structured::Typing(_) => unreachable!()
+                Structured::Typing(_) => unreachable!(),
+                Structured::Value(_) => unreachable!()
             }
         }
         Ok(())
     }
 
     fn persist_change(&mut self, tname: &str, global: bool) -> Result<()> {
-        let tbl = self.s_envs.resolve_mut(tname).unwrap();
+        let tbl = self.env.resolve_mut(tname).unwrap();
         self.storage.create_table(tname, global)?;
         if global {
             match tbl {
@@ -488,6 +494,7 @@ impl Evaluator<RocksStorage> {
                 Structured::Columns(_) => unimplemented!(),
                 Structured::Index(_) => unimplemented!(),
                 Structured::Typing(_) => panic!(),
+                Structured::Value(_) => unreachable!()
             }
         } else {
             Ok(())
@@ -504,9 +511,9 @@ impl Evaluator<RocksStorage> {
                     let global = r == Rule::global_def;
                     let local_id = self.get_next_local_id(global);
                     let env_to_build = if global {
-                        self.s_envs.root_mut()
+                        self.env.root_mut()
                     } else {
-                        self.s_envs.cur_mut()
+                        self.env.cur_mut()
                     };
                     new_tables.push((global, match inner.as_rule() {
                         Rule::node_def => {
@@ -566,7 +573,7 @@ mod tests {
         eval.build_table(parsed).unwrap();
         eval.restore_metadata().unwrap();
         eval.storage.delete().unwrap();
-        println!("{:#?}", eval.s_envs.resolve("Person"));
-        println!("{:#?}", eval.s_envs.resolve("Friend"));
+        println!("{:#?}", eval.env.resolve("Person"));
+        println!("{:#?}", eval.env.resolve("Friend"));
     }
 }
\ No newline at end of file
diff --git a/src/error.rs b/src/error.rs
index b4918e08..d3d18166 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -22,6 +22,12 @@ pub enum CozoError {
     #[error("Undefined type")]
     UndefinedType,
 
+    #[error("Undefined parameter")]
+    UndefinedParam,
+
+    #[error("Value required")]
+    ValueRequired,
+
     #[error("Wrong type")]
     WrongType,
 
@@ -44,7 +50,10 @@ pub enum CozoError {
     Parse(#[from] pest::error::Error<Rule>),
 
     #[error(transparent)]
-    Storage(#[from] cozo_rocks::BridgeStatus)
+    Storage(#[from] cozo_rocks::BridgeStatus),
+
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
 }
 
 pub type Result<T> = result::Result<T, CozoError>;
\ No newline at end of file
diff --git a/src/eval.rs b/src/eval.rs
index ae166940..00d043b5 100644
--- a/src/eval.rs
+++ b/src/eval.rs
@@ -7,16 +7,17 @@ use crate::error::CozoError;
 use crate::error::CozoError::*;
 use crate::value::Value::*;
 use crate::ast::*;
-use crate::env::StructuredEnv;
+use crate::env::{Env, StructuredEnv};
 use crate::storage::{DummyStorage, RocksStorage, Storage};
+use crate::typing::Structured;
 
 pub struct Evaluator<S: Storage> {
-    pub s_envs: StructuredEnv,
+    pub env: StructuredEnv,
     pub storage: S,
     pub last_local_id: Arc<AtomicUsize>,
 }
 
-impl <S:Storage> Evaluator<S> {
+impl<S: Storage> Evaluator<S> {
     pub fn get_next_local_id(&self, is_global: bool) -> usize {
         if is_global {
             0
@@ -32,7 +33,7 @@ pub type BareEvaluator = Evaluator<DummyStorage>;
 impl EvaluatorWithStorage {
     pub fn new(path: String) -> Result<Self> {
         Ok(Self {
-            s_envs: StructuredEnv::new(),
+            env: StructuredEnv::new(),
             storage: RocksStorage::new(path)?,
             last_local_id: Arc::new(AtomicUsize::new(1)),
         })
@@ -42,7 +43,7 @@ impl EvaluatorWithStorage {
 impl Default for BareEvaluator {
     fn default() -> Self {
         Self {
-            s_envs: StructuredEnv::new(),
+            env: StructuredEnv::new(),
             storage: DummyStorage,
             last_local_id: Arc::new(AtomicUsize::new(0)),
         }
@@ -80,6 +81,16 @@ impl<'a, S: Storage> ExprVisitor<'a, Result<Expr<'a>>> for Evaluator<S> {
             Const(v) => Ok(Const(v.clone())),
             Expr::List(_) => { unimplemented!() }
             Expr::Dict(_, _) => { unimplemented!() }
+            Ident(ident) => {
+                let resolved = self.env.resolve(ident).ok_or(UndefinedParam)?;
+                match resolved {
+                    Structured::Value(v) => {
+                        Ok(Const(v.clone()))
+                    }
+                    _ => return Err(ValueRequired)
+                }
+
+            }
         }
     }
 }
@@ -100,10 +111,10 @@ impl<S: Storage> Evaluator<S> {
                             (Float(va), Int(vb)) => Float(va + vb as f64),
                             (Int(va), Float(vb)) => Float(va as f64 + vb),
                             (Float(va), Float(vb)) => Float(va + vb),
-                            (OwnString(va), OwnString(vb)) => OwnString(Box::new(*va + &*vb)),
-                            (OwnString(va), RefString(vb)) => OwnString(Box::new(*va + &*vb)),
-                            (RefString(va), OwnString(vb)) => OwnString(Box::new(va.to_string() + &*vb)),
-                            (RefString(va), RefString(vb)) => OwnString(Box::new(va.to_string() + &*vb)),
+                            (OwnString(va), OwnString(vb)) => OwnString(Arc::new(va.clone().to_string() + &vb)),
+                            (OwnString(va), RefString(vb)) => OwnString(Arc::new(va.clone().to_string() + &*vb)),
+                            (RefString(va), OwnString(vb)) => OwnString(Arc::new(va.to_string() + &*vb)),
+                            (RefString(va), RefString(vb)) => OwnString(Arc::new(va.to_string() + &*vb)),
                             (_, _) => return Err(CozoError::TypeError)
                         }
                     }
@@ -535,342 +546,4 @@ mod tests {
         println!("{:#?}", ev.visit_expr(&parse_expr_from_str("null || true").unwrap()).unwrap());
         println!("{:#?}", ev.visit_expr(&parse_expr_from_str("true && null").unwrap()).unwrap());
     }
-
-
-    #[test]
-    fn data() -> Result<()> {
-        let data = r#"[{"_src":"AR","_dst":2,"_type":"InRegion"},
-{"_src":"AU","_dst":3,"_type":"InRegion"},
-{"_src":"BE","_dst":1,"_type":"InRegion"},
-{"_src":"BR","_dst":2,"_type":"InRegion"},
-{"_src":"CA","_dst":2,"_type":"InRegion"},
-{"_src":"CH","_dst":1,"_type":"InRegion"},
-{"_src":"CN","_dst":3,"_type":"InRegion"},
-{"_src":"DE","_dst":1,"_type":"InRegion"},
-{"_src":"DK","_dst":1,"_type":"InRegion"},
-{"_src":"EG","_dst":4,"_type":"InRegion"},
-{"_src":"FR","_dst":1,"_type":"InRegion"},
-{"_src":"HK","_dst":3,"_type":"InRegion"},
-{"_src":"IL","_dst":4,"_type":"InRegion"},
-{"_src":"IN","_dst":3,"_type":"InRegion"},
-{"_src":"IT","_dst":1,"_type":"InRegion"},
-{"_src":"JP","_dst":3,"_type":"InRegion"},
-{"_src":"KW","_dst":4,"_type":"InRegion"},
-{"_src":"MX","_dst":2,"_type":"InRegion"},
-{"_src":"NG","_dst":4,"_type":"InRegion"},
-{"_src":"NL","_dst":1,"_type":"InRegion"},
-{"_src":"SG","_dst":3,"_type":"InRegion"},
-{"_src":"UK","_dst":1,"_type":"InRegion"},
-{"_src":"US","_dst":2,"_type":"InRegion"},
-{"_src":"ZM","_dst":4,"_type":"InRegion"},
-{"_src":"ZW","_dst":4,"_type":"InRegion"},
-{"_src":1400,"_dst":"US","_type":"InCountry"},
-{"_src":1500,"_dst":"US","_type":"InCountry"},
-{"_src":1700,"_dst":"US","_type":"InCountry"},
-{"_src":1800,"_dst":"CA","_type":"InCountry"},
-{"_src":2400,"_dst":"UK","_type":"InCountry"},
-{"_src":2500,"_dst":"UK","_type":"InCountry"},
-{"_src":2700,"_dst":"DE","_type":"InCountry"},
-{"_dst":101,"_src":100,"_type":"Manages"},
-{"_dst":102,"_src":100,"_type":"Manages"},
-{"_dst":103,"_src":102,"_type":"Manages"},
-{"_dst":104,"_src":103,"_type":"Manages"},
-{"_dst":105,"_src":103,"_type":"Manages"},
-{"_dst":106,"_src":103,"_type":"Manages"},
-{"_dst":107,"_src":103,"_type":"Manages"},
-{"_dst":108,"_src":101,"_type":"Manages"},
-{"_dst":109,"_src":108,"_type":"Manages"},
-{"_dst":110,"_src":108,"_type":"Manages"},
-{"_dst":111,"_src":108,"_type":"Manages"},
-{"_dst":112,"_src":108,"_type":"Manages"},
-{"_dst":113,"_src":108,"_type":"Manages"},
-{"_dst":114,"_src":100,"_type":"Manages"},
-{"_dst":115,"_src":114,"_type":"Manages"},
-{"_dst":116,"_src":114,"_type":"Manages"},
-{"_dst":117,"_src":114,"_type":"Manages"},
-{"_dst":118,"_src":114,"_type":"Manages"},
-{"_dst":119,"_src":114,"_type":"Manages"},
-{"_dst":120,"_src":100,"_type":"Manages"},
-{"_dst":121,"_src":100,"_type":"Manages"},
-{"_dst":122,"_src":100,"_type":"Manages"},
-{"_dst":123,"_src":100,"_type":"Manages"},
-{"_dst":126,"_src":120,"_type":"Manages"},
-{"_dst":145,"_src":100,"_type":"Manages"},
-{"_dst":146,"_src":100,"_type":"Manages"},
-{"_dst":176,"_src":100,"_type":"Manages"},
-{"_dst":177,"_src":100,"_type":"Manages"},
-{"_dst":178,"_src":100,"_type":"Manages"},
-{"_dst":179,"_src":100,"_type":"Manages"},
-{"_dst":192,"_src":123,"_type":"Manages"},
-{"_dst":193,"_src":123,"_type":"Manages"},
-{"_dst":200,"_src":101,"_type":"Manages"},
-{"_dst":201,"_src":100,"_type":"Manages"},
-{"_dst":202,"_src":201,"_type":"Manages"},
-{"_dst":203,"_src":101,"_type":"Manages"},
-{"_dst":204,"_src":101,"_type":"Manages"},
-{"_dst":205,"_src":101,"_type":"Manages"},
-{"_dst":206,"_src":205,"_type":"Manages"},
-{"_src":100,"hire_date":"1987-06-17","_dst":4,"salary":24000.0,"_type":"HasJob"},
-{"_src":101,"hire_date":"1989-09-21","_dst":5,"salary":17000.0,"_type":"HasJob"},
-{"_src":102,"hire_date":"1993-01-13","_dst":5,"salary":17000.0,"_type":"HasJob"},
-{"_src":103,"hire_date":"1990-01-03","_dst":9,"salary":9000.0,"_type":"HasJob"},
-{"_src":104,"hire_date":"1991-05-21","_dst":9,"salary":6000.0,"_type":"HasJob"},
-{"_src":105,"hire_date":"1997-06-25","_dst":9,"salary":4800.0,"_type":"HasJob"},
-{"_src":106,"hire_date":"1998-02-05","_dst":9,"salary":4800.0,"_type":"HasJob"},
-{"_src":107,"hire_date":"1999-02-07","_dst":9,"salary":4200.0,"_type":"HasJob"},
-{"_src":108,"hire_date":"1994-08-17","_dst":7,"salary":12000.0,"_type":"HasJob"},
-{"_src":109,"hire_date":"1994-08-16","_dst":6,"salary":9000.0,"_type":"HasJob"},
-{"_src":110,"hire_date":"1997-09-28","_dst":6,"salary":8200.0,"_type":"HasJob"},
-{"_src":111,"hire_date":"1997-09-30","_dst":6,"salary":7700.0,"_type":"HasJob"},
-{"_src":112,"hire_date":"1998-03-07","_dst":6,"salary":7800.0,"_type":"HasJob"},
-{"_src":113,"hire_date":"1999-12-07","_dst":6,"salary":6900.0,"_type":"HasJob"},
-{"_src":114,"hire_date":"1994-12-07","_dst":14,"salary":11000.0,"_type":"HasJob"},
-{"_src":115,"hire_date":"1995-05-18","_dst":13,"salary":3100.0,"_type":"HasJob"},
-{"_src":116,"hire_date":"1997-12-24","_dst":13,"salary":2900.0,"_type":"HasJob"},
-{"_src":117,"hire_date":"1997-07-24","_dst":13,"salary":2800.0,"_type":"HasJob"},
-{"_src":118,"hire_date":"1998-11-15","_dst":13,"salary":2600.0,"_type":"HasJob"},
-{"_src":119,"hire_date":"1999-08-10","_dst":13,"salary":2500.0,"_type":"HasJob"},
-{"_src":120,"hire_date":"1996-07-18","_dst":19,"salary":8000.0,"_type":"HasJob"},
-{"_src":121,"hire_date":"1997-04-10","_dst":19,"salary":8200.0,"_type":"HasJob"},
-{"_src":122,"hire_date":"1995-05-01","_dst":19,"salary":7900.0,"_type":"HasJob"},
-{"_src":123,"hire_date":"1997-10-10","_dst":19,"salary":6500.0,"_type":"HasJob"},
-{"_src":126,"hire_date":"1998-09-28","_dst":18,"salary":2700.0,"_type":"HasJob"},
-{"_src":145,"hire_date":"1996-10-01","_dst":15,"salary":14000.0,"_type":"HasJob"},
-{"_src":146,"hire_date":"1997-01-05","_dst":15,"salary":13500.0,"_type":"HasJob"},
-{"_src":176,"hire_date":"1998-03-24","_dst":16,"salary":8600.0,"_type":"HasJob"},
-{"_src":177,"hire_date":"1998-04-23","_dst":16,"salary":8400.0,"_type":"HasJob"},
-{"_src":178,"hire_date":"1999-05-24","_dst":16,"salary":7000.0,"_type":"HasJob"},
-{"_src":179,"hire_date":"2000-01-04","_dst":16,"salary":6200.0,"_type":"HasJob"},
-{"_src":192,"hire_date":"1996-02-04","_dst":17,"salary":4000.0,"_type":"HasJob"},
-{"_src":193,"hire_date":"1997-03-03","_dst":17,"salary":3900.0,"_type":"HasJob"},
-{"_src":200,"hire_date":"1987-09-17","_dst":3,"salary":4400.0,"_type":"HasJob"},
-{"_src":201,"hire_date":"1996-02-17","_dst":10,"salary":13000.0,"_type":"HasJob"},
-{"_src":202,"hire_date":"1997-08-17","_dst":11,"salary":6000.0,"_type":"HasJob"},
-{"_src":203,"hire_date":"1994-06-07","_dst":8,"salary":6500.0,"_type":"HasJob"},
-{"_src":204,"hire_date":"1994-06-07","_dst":12,"salary":10000.0,"_type":"HasJob"},
-{"_src":205,"hire_date":"1994-06-07","_dst":2,"salary":12000.0,"_type":"HasJob"},
-{"_src":206,"hire_date":"1994-06-07","_dst":1,"salary":8300.0,"_type":"HasJob"},
-{"_src":1,"_dst":1700,"_type":"InLocation"},
-{"_src":2,"_dst":1800,"_type":"InLocation"},
-{"_src":3,"_dst":1700,"_type":"InLocation"},
-{"_src":4,"_dst":2400,"_type":"InLocation"},
-{"_src":5,"_dst":1500,"_type":"InLocation"},
-{"_src":6,"_dst":1400,"_type":"InLocation"},
-{"_src":7,"_dst":2700,"_type":"InLocation"},
-{"_src":8,"_dst":2500,"_type":"InLocation"},
-{"_src":9,"_dst":1700,"_type":"InLocation"},
-{"_src":10,"_dst":1700,"_type":"InLocation"},
-{"_src":11,"_dst":1700,"_type":"InLocation"},
-{"id":1,"title":"Public Accountant","min_salary":4200.0,"max_salary":9000.0,"_type":"Job"},
-{"id":2,"title":"Accounting Manager","min_salary":8200.0,"max_salary":16000.0,"_type":"Job"},
-{"id":3,"title":"Administration Assistant","min_salary":3000.0,"max_salary":6000.0,"_type":"Job"},
-{"id":4,"title":"President","min_salary":20000.0,"max_salary":40000.0,"_type":"Job"},
-{"id":5,"title":"Administration Vice President","min_salary":15000.0,"max_salary":30000.0,"_type":"Job"},
-{"id":6,"title":"Accountant","min_salary":4200.0,"max_salary":9000.0,"_type":"Job"},
-{"id":7,"title":"Finance Manager","min_salary":8200.0,"max_salary":16000.0,"_type":"Job"},
-{"id":8,"title":"Human Resources Representative","min_salary":4000.0,"max_salary":9000.0,"_type":"Job"},
-{"id":9,"title":"Programmer","min_salary":4000.0,"max_salary":10000.0,"_type":"Job"},
-{"id":10,"title":"Marketing Manager","min_salary":9000.0,"max_salary":15000.0,"_type":"Job"},
-{"id":11,"title":"Marketing Representative","min_salary":4000.0,"max_salary":9000.0,"_type":"Job"},
-{"id":12,"title":"Public Relations Representative","min_salary":4500.0,"max_salary":10500.0,"_type":"Job"},
-{"id":13,"title":"Purchasing Clerk","min_salary":2500.0,"max_salary":5500.0,"_type":"Job"},
-{"id":14,"title":"Purchasing Manager","min_salary":8000.0,"max_salary":15000.0,"_type":"Job"},
-{"id":15,"title":"Sales Manager","min_salary":10000.0,"max_salary":20000.0,"_type":"Job"},
-{"id":16,"title":"Sales Representative","min_salary":6000.0,"max_salary":12000.0,"_type":"Job"},
-{"id":17,"title":"Shipping Clerk","min_salary":2500.0,"max_salary":5500.0,"_type":"Job"},
-{"id":18,"title":"Stock Clerk","min_salary":2000.0,"max_salary":5000.0,"_type":"Job"},
-{"id":19,"title":"Stock Manager","min_salary":5500.0,"max_salary":8500.0,"_type":"Job"},
-{"id":1,"first_name":"Penelope","last_name":"Gietz","_type":"Dependent"},
-{"id":2,"first_name":"Nick","last_name":"Higgins","_type":"Dependent"},
-{"id":3,"first_name":"Ed","last_name":"Whalen","_type":"Dependent"},
-{"id":4,"first_name":"Jennifer","last_name":"King","_type":"Dependent"},
-{"id":5,"first_name":"Johnny","last_name":"Kochhar","_type":"Dependent"},
-{"id":6,"first_name":"Bette","last_name":"De Haan","_type":"Dependent"},
-{"id":7,"first_name":"Grace","last_name":"Faviet","_type":"Dependent"},
-{"id":8,"first_name":"Matthew","last_name":"Chen","_type":"Dependent"},
-{"id":9,"first_name":"Joe","last_name":"Sciarra","_type":"Dependent"},
-{"id":10,"first_name":"Christian","last_name":"Urman","_type":"Dependent"},
-{"id":11,"first_name":"Zero","last_name":"Popp","_type":"Dependent"},
-{"id":12,"first_name":"Karl","last_name":"Greenberg","_type":"Dependent"},
-{"id":13,"first_name":"Uma","last_name":"Mavris","_type":"Dependent"},
-{"id":14,"first_name":"Vivien","last_name":"Hunold","_type":"Dependent"},
-{"id":15,"first_name":"Cuba","last_name":"Ernst","_type":"Dependent"},
-{"id":16,"first_name":"Fred","last_name":"Austin","_type":"Dependent"},
-{"id":17,"first_name":"Helen","last_name":"Pataballa","_type":"Dependent"},
-{"id":18,"first_name":"Dan","last_name":"Lorentz","_type":"Dependent"},
-{"id":19,"first_name":"Bob","last_name":"Hartstein","_type":"Dependent"},
-{"id":20,"first_name":"Lucille","last_name":"Fay","_type":"Dependent"},
-{"id":21,"first_name":"Kirsten","last_name":"Baer","_type":"Dependent"},
-{"id":22,"first_name":"Elvis","last_name":"Khoo","_type":"Dependent"},
-{"id":23,"first_name":"Sandra","last_name":"Baida","_type":"Dependent"},
-{"id":24,"first_name":"Cameron","last_name":"Tobias","_type":"Dependent"},
-{"id":25,"first_name":"Kevin","last_name":"Himuro","_type":"Dependent"},
-{"id":26,"first_name":"Rip","last_name":"Colmenares","_type":"Dependent"},
-{"id":27,"first_name":"Julia","last_name":"Raphaely","_type":"Dependent"},
-{"id":28,"first_name":"Woody","last_name":"Russell","_type":"Dependent"},
-{"id":29,"first_name":"Alec","last_name":"Partners","_type":"Dependent"},
-{"id":30,"first_name":"Sandra","last_name":"Taylor","_type":"Dependent"},
-{"id":1,"name":"Administration","_type":"Department"},
-{"id":2,"name":"Marketing","_type":"Department"},
-{"id":3,"name":"Purchasing","_type":"Department"},
-{"id":4,"name":"Human Resources","_type":"Department"},
-{"id":5,"name":"Shipping","_type":"Department"},
-{"id":6,"name":"IT","_type":"Department"},
-{"id":7,"name":"Public Relations","_type":"Department"},
-{"id":8,"name":"Sales","_type":"Department"},
-{"id":9,"name":"Executive","_type":"Department"},
-{"id":10,"name":"Finance","_type":"Department"},
-{"id":11,"name":"Accounting","_type":"Department"},
-{"id":1,"name":"Europe","_type":"Region"},
-{"id":2,"name":"Americas","_type":"Region"},
-{"id":3,"name":"Asia","_type":"Region"},
-{"id":4,"name":"Middle East and Africa","_type":"Region"},
-{"id":"AR","name":"Argentina","_type":"Country"},
-{"id":"AU","name":"Australia","_type":"Country"},
-{"id":"BE","name":"Belgium","_type":"Country"},
-{"id":"BR","name":"Brazil","_type":"Country"},
-{"id":"CA","name":"Canada","_type":"Country"},
-{"id":"CH","name":"Switzerland","_type":"Country"},
-{"id":"CN","name":"China","_type":"Country"},
-{"id":"DE","name":"Germany","_type":"Country"},
-{"id":"DK","name":"Denmark","_type":"Country"},
-{"id":"EG","name":"Egypt","_type":"Country"},
-{"id":"FR","name":"France","_type":"Country"},
-{"id":"HK","name":"HongKong","_type":"Country"},
-{"id":"IL","name":"Israel","_type":"Country"},
-{"id":"IN","name":"India","_type":"Country"},
-{"id":"IT","name":"Italy","_type":"Country"},
-{"id":"JP","name":"Japan","_type":"Country"},
-{"id":"KW","name":"Kuwait","_type":"Country"},
-{"id":"MX","name":"Mexico","_type":"Country"},
-{"id":"NG","name":"Nigeria","_type":"Country"},
-{"id":"NL","name":"Netherlands","_type":"Country"},
-{"id":"SG","name":"Singapore","_type":"Country"},
-{"id":"UK","name":"United Kingdom","_type":"Country"},
-{"id":"US","name":"United States of America","_type":"Country"},
-{"id":"ZM","name":"Zambia","_type":"Country"},
-{"id":"ZW","name":"Zimbabwe","_type":"Country"},
-{"_src":1,"relationship":"Child","_dst":206,"_type":"HasDependent"},
-{"_src":2,"relationship":"Child","_dst":205,"_type":"HasDependent"},
-{"_src":3,"relationship":"Child","_dst":200,"_type":"HasDependent"},
-{"_src":4,"relationship":"Child","_dst":100,"_type":"HasDependent"},
-{"_src":5,"relationship":"Child","_dst":101,"_type":"HasDependent"},
-{"_src":6,"relationship":"Child","_dst":102,"_type":"HasDependent"},
-{"_src":7,"relationship":"Child","_dst":109,"_type":"HasDependent"},
-{"_src":8,"relationship":"Child","_dst":110,"_type":"HasDependent"},
-{"_src":9,"relationship":"Child","_dst":111,"_type":"HasDependent"},
-{"_src":10,"relationship":"Child","_dst":112,"_type":"HasDependent"},
-{"_src":11,"relationship":"Child","_dst":113,"_type":"HasDependent"},
-{"_src":12,"relationship":"Child","_dst":108,"_type":"HasDependent"},
-{"_src":13,"relationship":"Child","_dst":203,"_type":"HasDependent"},
-{"_src":14,"relationship":"Child","_dst":103,"_type":"HasDependent"},
-{"_src":15,"relationship":"Child","_dst":104,"_type":"HasDependent"},
-{"_src":16,"relationship":"Child","_dst":105,"_type":"HasDependent"},
-{"_src":17,"relationship":"Child","_dst":106,"_type":"HasDependent"},
-{"_src":18,"relationship":"Child","_dst":107,"_type":"HasDependent"},
-{"_src":19,"relationship":"Child","_dst":201,"_type":"HasDependent"},
-{"_src":20,"relationship":"Child","_dst":202,"_type":"HasDependent"},
-{"_src":21,"relationship":"Child","_dst":204,"_type":"HasDependent"},
-{"_src":22,"relationship":"Child","_dst":115,"_type":"HasDependent"},
-{"_src":23,"relationship":"Child","_dst":116,"_type":"HasDependent"},
-{"_src":24,"relationship":"Child","_dst":117,"_type":"HasDependent"},
-{"_src":25,"relationship":"Child","_dst":118,"_type":"HasDependent"},
-{"_src":26,"relationship":"Child","_dst":119,"_type":"HasDependent"},
-{"_src":27,"relationship":"Child","_dst":114,"_type":"HasDependent"},
-{"_src":28,"relationship":"Child","_dst":145,"_type":"HasDependent"},
-{"_src":29,"relationship":"Child","_dst":146,"_type":"HasDependent"},
-{"_src":30,"relationship":"Child","_dst":176,"_type":"HasDependent"},
-{"id":1400,"street_address":"2014 Jabberwocky Rd","postal_code":"26192","city":"Southlake","state_province":"Texas","_type":"Location"},
-{"id":1500,"street_address":"2011 Interiors Blvd","postal_code":"99236","city":"South San Francisco","state_province":"California","_type":"Location"},
-{"id":1700,"street_address":"2004 Charade Rd","postal_code":"98199","city":"Seattle","state_province":"Washington","_type":"Location"},
-{"id":1800,"street_address":"147 Spadina Ave","postal_code":"M5V 2L7","city":"Toronto","state_province":"Ontario","_type":"Location"},
-{"id":2400,"street_address":"8204 Arthur St","postal_code":null,"city":"London","state_province":null,"_type":"Location"},
-{"id":2500,"street_address":"Magdalen Centre  The Oxford Science Park","postal_code":"OX9 9ZB","city":"Oxford","state_province":"Oxford","_type":"Location"},
-{"id":2700,"street_address":"Schwanthalerstr. 7031","postal_code":"80925","city":"Munich","state_province":"Bavaria","_type":"Location"},
-{"id":100,"first_name":"Steven","last_name":"King","email":"steven.king@sqltutorial.org","phone_number":"515.123.4567","_type":"Employee"},
-{"id":101,"first_name":"Neena","last_name":"Kochhar","email":"neena.kochhar@sqltutorial.org","phone_number":"515.123.4568","_type":"Employee"},
-{"id":102,"first_name":"Lex","last_name":"De Haan","email":"lex.de haan@sqltutorial.org","phone_number":"515.123.4569","_type":"Employee"},
-{"id":103,"first_name":"Alexander","last_name":"Hunold","email":"alexander.hunold@sqltutorial.org","phone_number":"590.423.4567","_type":"Employee"},
-{"id":104,"first_name":"Bruce","last_name":"Ernst","email":"bruce.ernst@sqltutorial.org","phone_number":"590.423.4568","_type":"Employee"},
-{"id":105,"first_name":"David","last_name":"Austin","email":"david.austin@sqltutorial.org","phone_number":"590.423.4569","_type":"Employee"},
-{"id":106,"first_name":"Valli","last_name":"Pataballa","email":"valli.pataballa@sqltutorial.org","phone_number":"590.423.4560","_type":"Employee"},
-{"id":107,"first_name":"Diana","last_name":"Lorentz","email":"diana.lorentz@sqltutorial.org","phone_number":"590.423.5567","_type":"Employee"},
-{"id":108,"first_name":"Nancy","last_name":"Greenberg","email":"nancy.greenberg@sqltutorial.org","phone_number":"515.124.4569","_type":"Employee"},
-{"id":109,"first_name":"Daniel","last_name":"Faviet","email":"daniel.faviet@sqltutorial.org","phone_number":"515.124.4169","_type":"Employee"},
-{"id":110,"first_name":"John","last_name":"Chen","email":"john.chen@sqltutorial.org","phone_number":"515.124.4269","_type":"Employee"},
-{"id":111,"first_name":"Ismael","last_name":"Sciarra","email":"ismael.sciarra@sqltutorial.org","phone_number":"515.124.4369","_type":"Employee"},
-{"id":112,"first_name":"Jose Manuel","last_name":"Urman","email":"jose manuel.urman@sqltutorial.org","phone_number":"515.124.4469","_type":"Employee"},
-{"id":113,"first_name":"Luis","last_name":"Popp","email":"luis.popp@sqltutorial.org","phone_number":"515.124.4567","_type":"Employee"},
-{"id":114,"first_name":"Den","last_name":"Raphaely","email":"den.raphaely@sqltutorial.org","phone_number":"515.127.4561","_type":"Employee"},
-{"id":115,"first_name":"Alexander","last_name":"Khoo","email":"alexander.khoo@sqltutorial.org","phone_number":"515.127.4562","_type":"Employee"},
-{"id":116,"first_name":"Shelli","last_name":"Baida","email":"shelli.baida@sqltutorial.org","phone_number":"515.127.4563","_type":"Employee"},
-{"id":117,"first_name":"Sigal","last_name":"Tobias","email":"sigal.tobias@sqltutorial.org","phone_number":"515.127.4564","_type":"Employee"},
-{"id":118,"first_name":"Guy","last_name":"Himuro","email":"guy.himuro@sqltutorial.org","phone_number":"515.127.4565","_type":"Employee"},
-{"id":119,"first_name":"Karen","last_name":"Colmenares","email":"karen.colmenares@sqltutorial.org","phone_number":"515.127.4566","_type":"Employee"},
-{"id":120,"first_name":"Matthew","last_name":"Weiss","email":"matthew.weiss@sqltutorial.org","phone_number":"650.123.1234","_type":"Employee"},
-{"id":121,"first_name":"Adam","last_name":"Fripp","email":"adam.fripp@sqltutorial.org","phone_number":"650.123.2234","_type":"Employee"},
-{"id":122,"first_name":"Payam","last_name":"Kaufling","email":"payam.kaufling@sqltutorial.org","phone_number":"650.123.3234","_type":"Employee"},
-{"id":123,"first_name":"Shanta","last_name":"Vollman","email":"shanta.vollman@sqltutorial.org","phone_number":"650.123.4234","_type":"Employee"},
-{"id":126,"first_name":"Irene","last_name":"Mikkilineni","email":"irene.mikkilineni@sqltutorial.org","phone_number":"650.124.1224","_type":"Employee"},
-{"id":145,"first_name":"John","last_name":"Russell","email":"john.russell@sqltutorial.org","phone_number":null,"_type":"Employee"},
-{"id":146,"first_name":"Karen","last_name":"Partners","email":"karen.partners@sqltutorial.org","phone_number":null,"_type":"Employee"},
-{"id":176,"first_name":"Jonathon","last_name":"Taylor","email":"jonathon.taylor@sqltutorial.org","phone_number":null,"_type":"Employee"},
-{"id":177,"first_name":"Jack","last_name":"Livingston","email":"jack.livingston@sqltutorial.org","phone_number":null,"_type":"Employee"},
-{"id":178,"first_name":"Kimberely","last_name":"Grant","email":"kimberely.grant@sqltutorial.org","phone_number":null,"_type":"Employee"},
-{"id":179,"first_name":"Charles","last_name":"Johnson","email":"charles.johnson@sqltutorial.org","phone_number":null,"_type":"Employee"},
-{"id":192,"first_name":"Sarah","last_name":"Bell","email":"sarah.bell@sqltutorial.org","phone_number":"650.501.1876","_type":"Employee"},
-{"id":193,"first_name":"Britney","last_name":"Everett","email":"britney.everett@sqltutorial.org","phone_number":"650.501.2876","_type":"Employee"},
-{"id":200,"first_name":"Jennifer","last_name":"Whalen","email":"jennifer.whalen@sqltutorial.org","phone_number":"515.123.4444","_type":"Employee"},
-{"id":201,"first_name":"Michael","last_name":"Hartstein","email":"michael.hartstein@sqltutorial.org","phone_number":"515.123.5555","_type":"Employee"},
-{"id":202,"first_name":"Pat","last_name":"Fay","email":"pat.fay@sqltutorial.org","phone_number":"603.123.6666","_type":"Employee"},
-{"id":203,"first_name":"Susan","last_name":"Mavris","email":"susan.mavris@sqltutorial.org","phone_number":"515.123.7777","_type":"Employee"},
-{"id":204,"first_name":"Hermann","last_name":"Baer","email":"hermann.baer@sqltutorial.org","phone_number":"515.123.8888","_type":"Employee"},
-{"id":205,"first_name":"Shelley","last_name":"Higgins","email":"shelley.higgins@sqltutorial.org","phone_number":"515.123.8080","_type":"Employee"},
-{"id":206,"first_name":"William","last_name":"Gietz","email":"william.gietz@sqltutorial.org","phone_number":"515.123.8181","_type":"Employee"},
-{"_src":100,"_dst":9,"_type":"InDepartment"},
-{"_src":101,"_dst":9,"_type":"InDepartment"},
-{"_src":102,"_dst":9,"_type":"InDepartment"},
-{"_src":103,"_dst":6,"_type":"InDepartment"},
-{"_src":104,"_dst":6,"_type":"InDepartment"},
-{"_src":105,"_dst":6,"_type":"InDepartment"},
-{"_src":106,"_dst":6,"_type":"InDepartment"},
-{"_src":107,"_dst":6,"_type":"InDepartment"},
-{"_src":108,"_dst":10,"_type":"InDepartment"},
-{"_src":109,"_dst":10,"_type":"InDepartment"},
-{"_src":110,"_dst":10,"_type":"InDepartment"},
-{"_src":111,"_dst":10,"_type":"InDepartment"},
-{"_src":112,"_dst":10,"_type":"InDepartment"},
-{"_src":113,"_dst":10,"_type":"InDepartment"},
-{"_src":114,"_dst":3,"_type":"InDepartment"},
-{"_src":115,"_dst":3,"_type":"InDepartment"},
-{"_src":116,"_dst":3,"_type":"InDepartment"},
-{"_src":117,"_dst":3,"_type":"InDepartment"},
-{"_src":118,"_dst":3,"_type":"InDepartment"},
-{"_src":119,"_dst":3,"_type":"InDepartment"},
-{"_src":120,"_dst":5,"_type":"InDepartment"},
-{"_src":121,"_dst":5,"_type":"InDepartment"},
-{"_src":122,"_dst":5,"_type":"InDepartment"},
-{"_src":123,"_dst":5,"_type":"InDepartment"},
-{"_src":126,"_dst":5,"_type":"InDepartment"},
-{"_src":145,"_dst":8,"_type":"InDepartment"},
-{"_src":146,"_dst":8,"_type":"InDepartment"},
-{"_src":176,"_dst":8,"_type":"InDepartment"},
-{"_src":177,"_dst":8,"_type":"InDepartment"},
-{"_src":178,"_dst":8,"_type":"InDepartment"},
-{"_src":179,"_dst":8,"_type":"InDepartment"},
-{"_src":192,"_dst":5,"_type":"InDepartment"},
-{"_src":193,"_dst":5,"_type":"InDepartment"},
-{"_src":200,"_dst":1,"_type":"InDepartment"},
-{"_src":201,"_dst":2,"_type":"InDepartment"},
-{"_src":202,"_dst":2,"_type":"InDepartment"},
-{"_src":203,"_dst":4,"_type":"InDepartment"},
-{"_src":204,"_dst":7,"_type":"InDepartment"},
-{"_src":205,"_dst":11,"_type":"InDepartment"},
-{"_src":206,"_dst":11,"_type":"InDepartment"}]"#;
-        let parsed = parse_expr_from_str(data)?;
-        let mut ev = BareEvaluator::default();
-        let evaluated = ev.visit_expr(&parsed)?;
-        println!("{:#?}", evaluated);
-        Ok(())
-    }
 }
\ No newline at end of file
diff --git a/src/grammar.pest b/src/grammar.pest
index 906520fc..55a6b634 100644
--- a/src/grammar.pest
+++ b/src/grammar.pest
@@ -158,7 +158,7 @@ statement = _{ global_def | local_def }
 
 mutation = { (insert|update|delete) ~ expr ~ ("as" ~ name_in_def)? ~
              ( (exclude ~ name_in_def ~ ("," ~ name_in_def)*)
-             | (include ~ name_in_def ~ ("," ~ name_in_def)*))? }
+             | (include ~ name_in_def ~ ("," ~ name_in_def)*))? ~ ";" }
 exclude = {"exclude"}
 include = {"include"}
 insert = {"insert"}
diff --git a/src/lib.rs b/src/lib.rs
index 1c2037bb..70f64599 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,4 +7,5 @@ pub mod eval;
 pub mod function;
 pub mod error;
 pub mod definition;
-pub mod storage;
\ No newline at end of file
+pub mod storage;
+pub mod mutation;
\ No newline at end of file
diff --git a/src/mutation.rs b/src/mutation.rs
new file mode 100644
index 00000000..71b0b707
--- /dev/null
+++ b/src/mutation.rs
@@ -0,0 +1,65 @@
+use pest::iterators::Pair;
+use crate::ast::{build_expr, Expr, ExprVisitor};
+use crate::error::CozoError::ValueRequired;
+use crate::eval::Evaluator;
+use crate::storage::{RocksStorage};
+use crate::error::Result;
+use crate::parser::{Parser, Rule};
+use crate::value::Value;
+
+impl Evaluator<RocksStorage> {
+    pub fn eval_mutation(&mut self, pair: Pair<Rule>) -> Result<()> {
+        let mut pairs = pair.into_inner();
+        let op = pairs.next().unwrap().as_rule();
+        let expr = pairs.next().unwrap();
+        let expr = build_expr(expr)?;
+        let expr = self.visit_expr(&expr)?;
+        let val = match expr {
+            Expr::Const(v) => v,
+            _ => return Err(ValueRequired)
+        };
+        println!("{:#?}", val);
+        Ok(())
+    }
+}
+
+
+#[cfg(test)]
+mod tests {
+    use std::fs;
+    use super::*;
+    use crate::ast::{Expr, ExprVisitor, parse_expr_from_str};
+    use crate::eval::{BareEvaluator, EvaluatorWithStorage};
+    use pest::Parser as PestParser;
+    use cozo_rocks::DBImpl;
+    use crate::env::Env;
+    use crate::typing::Structured;
+
+    #[test]
+    fn data() -> Result<()> {
+        let ddl = fs::read_to_string("test_data/hr.cozo")?;
+        let parsed = Parser::parse(Rule::file, &ddl).unwrap();
+        let mut eval = EvaluatorWithStorage::new("_path_hr".to_string()).unwrap();
+        eval.build_table(parsed).unwrap();
+        eval.restore_metadata().unwrap();
+        println!("{:?}", eval.storage.db.all_cf_names());
+
+        let insertion = "insert $data;";
+        let mut insert_stmt = Parser::parse(Rule::mutation, insertion).unwrap();
+
+        let data = fs::read_to_string("test_data/hr.json")?;
+        let parsed = parse_expr_from_str(&data)?;
+        let mut ev = BareEvaluator::default();
+        let evaluated = ev.visit_expr(&parsed)?;
+        let bound_value = match evaluated {
+            Expr::Const(v) => v,
+            _ => unreachable!()
+        };
+        eval.env.push();
+        eval.env.define("$data".to_string(), Structured::Value(bound_value.to_owned()));
+        eval.eval_mutation(insert_stmt.next().unwrap()).unwrap();
+        // println!("{:#?}", evaluated);
+        eval.env.pop();
+        Ok(())
+    }
+}
\ No newline at end of file
diff --git a/src/typing.rs b/src/typing.rs
index dcbc90f6..10f4e55e 100644
--- a/src/typing.rs
+++ b/src/typing.rs
@@ -204,6 +204,7 @@ pub enum Structured {
     Edge(Edge),
     Columns(Columns),
     Index(Index),
+    Value(Value<'static>)
 }
 
 impl Structured {
@@ -213,7 +214,8 @@ impl Structured {
             Structured::Node(n) => Some(n.id.clone()),
             Structured::Edge(e) => Some(e.id.clone()),
             Structured::Columns(c) => Some(c.id.clone()),
-            Structured::Index(i) => Some(i.id.clone())
+            Structured::Index(i) => Some(i.id.clone()),
+            Structured::Value(_) => None
         }
     }
 }
diff --git a/src/value.rs b/src/value.rs
index 26c43992..7cbd70ab 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -6,6 +6,7 @@ use ordered_float::OrderedFloat;
 use uuid::Uuid;
 use crate::typing::{Typing};
 use Ordering::{Greater, Less, Equal};
+use std::sync::Arc;
 
 // TODO: array types, alignment of values
 #[repr(u8)]
@@ -66,22 +67,22 @@ pub enum Value<'a> {
     Float(f64),
     Uuid(Uuid),
     RefString(&'a str),
-    OwnString(Box<String>),
-    List(Box<Vec<Value<'a>>>),
-    Dict(Box<BTreeMap<Cow<'a, str>, Value<'a>>>),
+    OwnString(Arc<String>),
+    List(Arc<Vec<Value<'a>>>),
+    Dict(Arc<BTreeMap<Cow<'a, str>, Value<'a>>>),
 }
 
 impl<'a> Value<'a> {
-    pub fn get_list(self) -> Option<Vec<Self>> {
+    pub fn get_list(&self) -> Option<Arc<Vec<Self>>> {
         match self {
-            Value::List(v) => Some(*v),
+            Value::List(v) => Some(v.clone()),
             _ => None
         }
     }
-    pub fn get_string(self) -> Option<String> {
+    pub fn get_string(&self) -> Option<Arc<String>> {
         match self {
-            Value::OwnString(v) => Some(*v),
-            Value::RefString(v) => Some(v.to_string()),
+            Value::OwnString(v) => Some(v.clone()),
+            Value::RefString(v) => Some(Arc::new(v.to_string())),
             _ => None
         }
     }
@@ -282,8 +283,8 @@ impl<'a> ByteArrayParser<'a> {
             FloatTag => Some(Float(self.parse_float()?)),
             StringTag => Some(RefString(self.parse_string()?)),
             UIntTag => Some(UInt(self.parse_varint()?)),
-            ListTag => Some(List(Box::new(self.parse_list()?))),
-            DictTag => Some(Dict(Box::new(self.parse_dict()?))),
+            ListTag => Some(List(Arc::new(self.parse_list()?))),
+            DictTag => Some(Dict(Arc::new(self.parse_dict()?))),
             UuidTag => Some(Uuid(self.parse_uuid()?))
         }
     }
@@ -505,35 +506,35 @@ pub fn cmp_data<'a>(pa: &mut ByteArrayParser<'a>, pb: &mut ByteArrayParser<'a>)
 
 
 impl<'a> Value<'a> {
-    pub fn into_owned(self) -> Value<'static> {
+    pub fn to_owned(&self) -> Value<'static> {
         use Value::*;
 
         match self {
             Null => Null,
-            Bool(b) => Bool(b),
-            EdgeDir(dir) => EdgeDir(dir),
-            UInt(u) => UInt(u),
-            Int(i) => Int(i),
-            Float(f) => Float(f),
-            RefString(s) => OwnString(Box::new(s.to_string())),
-            OwnString(s) => OwnString(s),
+            Bool(b) => Bool(*b),
+            EdgeDir(dir) => EdgeDir(*dir),
+            UInt(u) => UInt(*u),
+            Int(i) => Int(*i),
+            Float(f) => Float(*f),
+            RefString(s) => OwnString(Arc::new(s.to_string())),
+            OwnString(s) => OwnString(s.clone()),
             List(l) => {
                 let mut inner = Vec::with_capacity(l.len());
 
-                for el in *l {
-                    inner.push(el.into_owned())
+                for el in l.iter() {
+                    inner.push(el.clone().to_owned())
                 }
-                List(Box::new(inner))
+                List(Arc::new(inner))
             }
             Dict(d) => {
                 let mut inner = BTreeMap::new();
-                for (k, v) in *d {
-                    let new_k = Cow::from(k.into_owned());
-                    inner.insert(new_k, v.into_owned());
+                for (k, v) in d.iter() {
+                    let new_k = Cow::from(k.clone().into_owned());
+                    inner.insert(new_k, v.clone().to_owned());
                 }
-                Dict(Box::new(inner))
+                Dict(Arc::new(inner))
             }
-            Uuid(u) => Uuid(u),
+            Uuid(u) => Uuid(*u),
         }
     }
 }
diff --git a/test_data/hr.cozo b/test_data/hr.cozo
new file mode 100644
index 00000000..a607e47f
--- /dev/null
+++ b/test_data/hr.cozo
@@ -0,0 +1,62 @@
+create node Job {
+    *id: Int,
+    title: String,
+    min_salary: Float,
+    max_salary: Float
+}
+
+create node Employee {
+    *id: Int,
+    first_name: String,
+    last_name: String,
+    email: String,
+    phone_number: ?String
+}
+
+create node Dependent {
+    *id: Int,
+    first_name: String,
+    last_name: String
+}
+
+create node Department {
+    *id: Int,
+    name: String
+}
+
+create node Location {
+    *id: Int,
+    street_address: String,
+    postal_code: ?String,
+    city: String,
+    state_province: ?String
+}
+
+create node Country {
+    *id: String,
+    name: String
+}
+
+create node Region {
+    *id: Int,
+    name: String
+}
+
+create edge (Employee)-[HasJob]->(Job) {
+    salary: Float,
+    hire_date: String
+}
+
+create edge (Employee)-[InDepartment]->(Department)
+
+create edge (Employee)-[Manages]->(Employee)
+
+create edge (Employee)-[HasDependent]->(Dependent) {
+    relationship: String
+}
+
+create edge (Department)-[InLocation]->(Location)
+
+create edge (Location)-[InCountry]->(Country)
+
+create edge (Country)-[InRegion]->(Region)
\ No newline at end of file
diff --git a/test_data/hr.json b/test_data/hr.json
new file mode 100644
index 00000000..0c51f53e
--- /dev/null
+++ b/test_data/hr.json
@@ -0,0 +1,1961 @@
+[
+  {
+    "_src": "AR",
+    "_dst": 2,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "AU",
+    "_dst": 3,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "BE",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "BR",
+    "_dst": 2,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "CA",
+    "_dst": 2,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "CH",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "CN",
+    "_dst": 3,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "DE",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "DK",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "EG",
+    "_dst": 4,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "FR",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "HK",
+    "_dst": 3,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "IL",
+    "_dst": 4,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "IN",
+    "_dst": 3,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "IT",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "JP",
+    "_dst": 3,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "KW",
+    "_dst": 4,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "MX",
+    "_dst": 2,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "NG",
+    "_dst": 4,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "NL",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "SG",
+    "_dst": 3,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "UK",
+    "_dst": 1,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "US",
+    "_dst": 2,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "ZM",
+    "_dst": 4,
+    "_type": "InRegion"
+  },
+  {
+    "_src": "ZW",
+    "_dst": 4,
+    "_type": "InRegion"
+  },
+  {
+    "_src": 1400,
+    "_dst": "US",
+    "_type": "InCountry"
+  },
+  {
+    "_src": 1500,
+    "_dst": "US",
+    "_type": "InCountry"
+  },
+  {
+    "_src": 1700,
+    "_dst": "US",
+    "_type": "InCountry"
+  },
+  {
+    "_src": 1800,
+    "_dst": "CA",
+    "_type": "InCountry"
+  },
+  {
+    "_src": 2400,
+    "_dst": "UK",
+    "_type": "InCountry"
+  },
+  {
+    "_src": 2500,
+    "_dst": "UK",
+    "_type": "InCountry"
+  },
+  {
+    "_src": 2700,
+    "_dst": "DE",
+    "_type": "InCountry"
+  },
+  {
+    "_dst": 101,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 102,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 103,
+    "_src": 102,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 104,
+    "_src": 103,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 105,
+    "_src": 103,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 106,
+    "_src": 103,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 107,
+    "_src": 103,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 108,
+    "_src": 101,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 109,
+    "_src": 108,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 110,
+    "_src": 108,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 111,
+    "_src": 108,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 112,
+    "_src": 108,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 113,
+    "_src": 108,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 114,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 115,
+    "_src": 114,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 116,
+    "_src": 114,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 117,
+    "_src": 114,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 118,
+    "_src": 114,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 119,
+    "_src": 114,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 120,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 121,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 122,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 123,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 126,
+    "_src": 120,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 145,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 146,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 176,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 177,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 178,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 179,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 192,
+    "_src": 123,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 193,
+    "_src": 123,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 200,
+    "_src": 101,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 201,
+    "_src": 100,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 202,
+    "_src": 201,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 203,
+    "_src": 101,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 204,
+    "_src": 101,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 205,
+    "_src": 101,
+    "_type": "Manages"
+  },
+  {
+    "_dst": 206,
+    "_src": 205,
+    "_type": "Manages"
+  },
+  {
+    "_src": 100,
+    "hire_date": "1987-06-17",
+    "_dst": 4,
+    "salary": 24000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 101,
+    "hire_date": "1989-09-21",
+    "_dst": 5,
+    "salary": 17000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 102,
+    "hire_date": "1993-01-13",
+    "_dst": 5,
+    "salary": 17000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 103,
+    "hire_date": "1990-01-03",
+    "_dst": 9,
+    "salary": 9000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 104,
+    "hire_date": "1991-05-21",
+    "_dst": 9,
+    "salary": 6000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 105,
+    "hire_date": "1997-06-25",
+    "_dst": 9,
+    "salary": 4800.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 106,
+    "hire_date": "1998-02-05",
+    "_dst": 9,
+    "salary": 4800.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 107,
+    "hire_date": "1999-02-07",
+    "_dst": 9,
+    "salary": 4200.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 108,
+    "hire_date": "1994-08-17",
+    "_dst": 7,
+    "salary": 12000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 109,
+    "hire_date": "1994-08-16",
+    "_dst": 6,
+    "salary": 9000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 110,
+    "hire_date": "1997-09-28",
+    "_dst": 6,
+    "salary": 8200.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 111,
+    "hire_date": "1997-09-30",
+    "_dst": 6,
+    "salary": 7700.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 112,
+    "hire_date": "1998-03-07",
+    "_dst": 6,
+    "salary": 7800.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 113,
+    "hire_date": "1999-12-07",
+    "_dst": 6,
+    "salary": 6900.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 114,
+    "hire_date": "1994-12-07",
+    "_dst": 14,
+    "salary": 11000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 115,
+    "hire_date": "1995-05-18",
+    "_dst": 13,
+    "salary": 3100.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 116,
+    "hire_date": "1997-12-24",
+    "_dst": 13,
+    "salary": 2900.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 117,
+    "hire_date": "1997-07-24",
+    "_dst": 13,
+    "salary": 2800.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 118,
+    "hire_date": "1998-11-15",
+    "_dst": 13,
+    "salary": 2600.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 119,
+    "hire_date": "1999-08-10",
+    "_dst": 13,
+    "salary": 2500.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 120,
+    "hire_date": "1996-07-18",
+    "_dst": 19,
+    "salary": 8000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 121,
+    "hire_date": "1997-04-10",
+    "_dst": 19,
+    "salary": 8200.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 122,
+    "hire_date": "1995-05-01",
+    "_dst": 19,
+    "salary": 7900.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 123,
+    "hire_date": "1997-10-10",
+    "_dst": 19,
+    "salary": 6500.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 126,
+    "hire_date": "1998-09-28",
+    "_dst": 18,
+    "salary": 2700.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 145,
+    "hire_date": "1996-10-01",
+    "_dst": 15,
+    "salary": 14000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 146,
+    "hire_date": "1997-01-05",
+    "_dst": 15,
+    "salary": 13500.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 176,
+    "hire_date": "1998-03-24",
+    "_dst": 16,
+    "salary": 8600.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 177,
+    "hire_date": "1998-04-23",
+    "_dst": 16,
+    "salary": 8400.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 178,
+    "hire_date": "1999-05-24",
+    "_dst": 16,
+    "salary": 7000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 179,
+    "hire_date": "2000-01-04",
+    "_dst": 16,
+    "salary": 6200.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 192,
+    "hire_date": "1996-02-04",
+    "_dst": 17,
+    "salary": 4000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 193,
+    "hire_date": "1997-03-03",
+    "_dst": 17,
+    "salary": 3900.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 200,
+    "hire_date": "1987-09-17",
+    "_dst": 3,
+    "salary": 4400.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 201,
+    "hire_date": "1996-02-17",
+    "_dst": 10,
+    "salary": 13000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 202,
+    "hire_date": "1997-08-17",
+    "_dst": 11,
+    "salary": 6000.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 203,
+    "hire_date": "1994-06-07",
+    "_dst": 8,
+    "salary": 6500.0,
+    "_type": "HasJob"
+  },
+  {
+    "_src": 204,
+    "hire_date": "1994-06-07",
+    "_dst": 12,
+    "salary": 10000.0,
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\ No newline at end of file