diff --git a/aquery_parser/sql_parser.py b/aquery_parser/sql_parser.py
index e24479b..fe0ebd9 100644
--- a/aquery_parser/sql_parser.py
+++ b/aquery_parser/sql_parser.py
@@ -16,18 +16,6 @@ from aquery_parser.types import get_column_type, time_functions
 from aquery_parser.utils import *
 from aquery_parser.windows import window
 
-
-def no_dashes(tokens, start, string):
-    if "-" in tokens[0]:
-        index = tokens[0].find("-")
-        raise ParseException(
-            tokens.type,
-            start + index + 1,  # +1 TO ENSURE THIS MESSAGE HAS PRIORITY
-            string,
-            """Ambiguity: Use backticks (``) around identifiers with dashes, or add space around subtraction operator.""",
-        )
- 
- 
 digit = Char("0123456789")
 simple_ident = (
     Char(FIRST_IDENT_CHAR)
diff --git a/csv.so b/csv.so
new file mode 100644
index 0000000..5c230b8
Binary files /dev/null and b/csv.so differ
diff --git a/engine/ast.py b/engine/ast.py
index 40d6782..aa23aef 100644
--- a/engine/ast.py
+++ b/engine/ast.py
@@ -1,6 +1,12 @@
 from typing import List
-import uuid
 
+# replace column info with this later.
+class ColRef:
+    def __init__(self, k9name, type, cobj, cnt):
+        self.k9name = k9name
+        self.type = type
+        self.cobj = cobj
+        self.cnt = cnt
 
 class TableInfo:
     def __init__(self, table_name, cols, cxt:'Context'):
diff --git a/engine/expr.py b/engine/expr.py
index 3722a3b..adf0819 100644
--- a/engine/expr.py
+++ b/engine/expr.py
@@ -4,12 +4,23 @@ from engine.ast import ast_node
 class expr(ast_node):
     name='expr'
     builtin_func_maps = {
-            'max': 'max',
-            'min': 'min', 
+        'max': 'max',
+        'min': 'min', 
+        'avg':'avg',
+        'sum':'sum',
 
-        }
-    binary_ops = {'sub':'-', 'plus':'+'}
-    unary_ops = []
+    }
+    binary_ops = {
+        'sub':'-', 
+        'add':'+', 
+        'mul':'*', 
+        'div':'%',
+
+    }
+    unary_ops = {
+        'neg' : '-',
+        
+    }
     def __init__(self, parent, node):
         from engine.projection import projection
         if type(parent) in [projection, expr]:
@@ -29,18 +40,19 @@ class expr(ast_node):
                     # if type(val) in [dict, str]:
                     self.k9expr += expr(self, val).k9expr
 
-                    self.k9expr+=')'
+                    self.k9expr += ')'
                 elif key in self.binary_ops:
                     l = expr(self, val[0]).k9expr
                     r = expr(self, val[1]).k9expr
                     self.k9expr += f'({l}{self.binary_ops[key]}{r})'
                     
-                    print(f'binary{key}')
                 elif key in self.unary_ops:
-                    print(f'unary{key}')
+                    self.k9expr += f'({expr(self, val).k9expr}{self.unary_ops[key]})'
                 else:
-                    print(key)
+                    print(f'Undefined expr: {key}{val}')
         elif type(node) is str:
             self.k9expr = self.datasource.parse_tablenames(node)
+        else:
+            self.k9expr = f'{node}'
     def __str__(self):
         return self.k9expr
\ No newline at end of file
diff --git a/engine/projection.py b/engine/projection.py
index 3e444b7..40d02b8 100644
--- a/engine/projection.py
+++ b/engine/projection.py
@@ -47,7 +47,9 @@ class projection(ast_node):
             
             if self.datasource is None:
                 raise ValueError('spawn error: from clause')
-    
+        if 'where' in node:
+            # apply filter
+            pass
 
 
     def consume(self, node):
diff --git a/moving_avg.csv b/moving_avg.csv
index e304cc2..f6b2570 100644
--- a/moving_avg.csv
+++ b/moving_avg.csv
@@ -1,6 +1,6 @@
-Month	sales
-1	100
-2	120
-4	140
-3	140
-5	130
+Month,sales
+1,100
+2,120
+4,140
+3,140
+5,130
diff --git a/run.py b/run.py
index afec3cc..09db800 100644
--- a/run.py
+++ b/run.py
@@ -1,3 +1,4 @@
+from multiprocessing.sharedctypes import Value
 import re
 import aquery_parser as parser
 import engine
@@ -18,11 +19,18 @@ while test_parser:
         q = input()
         if q == 'exec':
             cxt = engine.initialize()
-            for s in stmts['stmts']:
-                engine.generate(s, cxt)
+            stmts_stmts = stmts['stmts']
+            if type(stmts_stmts) is list:
+                for s in stmts_stmts:
+                    engine.generate(s, cxt)
+            else:
+                engine.generate(stmts_stmts, cxt)
             print(cxt.k9code)
             with open('out.k', 'wb') as outfile:
-                outfile.write(cxt.k9code)
+                outfile.write(cxt.k9code.encode('utf-8'))
+            continue
+        elif q == 'print':
+            print(stmts)
             continue
         trimed = ws.sub(' ', q.lower()).split(' ') 
         if trimed[0] == 'file':
@@ -35,6 +43,6 @@ while test_parser:
             continue
         stmts = parser.parse(q)
         print(stmts)
-    except Exception as e:
+    except ValueError as e:
         print(type(e), e)