diff --git a/eland/dataframe.py b/eland/dataframe.py
index 98d6dab..852e06a 100644
--- a/eland/dataframe.py
+++ b/eland/dataframe.py
@@ -43,7 +43,7 @@ class DataFrame(NDFrame):
         - elasticsearch-py instance or
         - eland.Client instance
     index_pattern: str
-        Elasticsearch index pattern (e.g. 'flights' or 'filebeat-\*')
+        Elasticsearch index pattern (e.g. 'flights' or 'filebeat-*')
     columns: list of str, optional
         List of DataFrame columns. A subset of the Elasticsearch index's fields.
     index_field: str, optional
diff --git a/eland/mappings.py b/eland/mappings.py
index a4457f9..48140eb 100644
--- a/eland/mappings.py
+++ b/eland/mappings.py
@@ -182,7 +182,7 @@ class Mappings:
         """
         all_fields_caps_fields = all_fields_caps['fields']
 
-        columns = ['_source', 'es_dtype', 'pd_dtype', 'searchable', 'aggregatable']
+        field_names = ['_source', 'es_dtype', 'pd_dtype', 'searchable', 'aggregatable']
         capability_matrix = {}
 
         for field, field_caps in all_fields_caps_fields.items():
@@ -208,7 +208,7 @@ class Mappings:
                                       format(field, vv['non_searchable_indices']),
                                       UserWarning)
 
-        capability_matrix_df = pd.DataFrame.from_dict(capability_matrix, orient='index', columns=columns)
+        capability_matrix_df = pd.DataFrame.from_dict(capability_matrix, orient='index', columns=field_names)
 
         return capability_matrix_df.sort_index()
 
@@ -325,14 +325,14 @@ class Mappings:
 
         mappings = {}
         mappings['properties'] = {}
-        for column_name, dtype in dataframe.dtypes.iteritems():
-            if geo_points is not None and column_name in geo_points:
+        for field_name_name, dtype in dataframe.dtypes.iteritems():
+            if geo_points is not None and field_name_name in geo_points:
                 es_dtype = 'geo_point'
             else:
                 es_dtype = Mappings._pd_dtype_to_es_dtype(dtype)
 
-            mappings['properties'][column_name] = {}
-            mappings['properties'][column_name]['type'] = es_dtype
+            mappings['properties'][field_name_name] = {}
+            mappings['properties'][field_name_name]['type'] = es_dtype
 
         return {"mappings": mappings}
 
@@ -407,12 +407,12 @@ class Mappings:
 
         return is_source_field
 
-    def aggregatable_columns(self, columns=None):
+    def aggregatable_field_names(self, field_names=None):
         """
-        Return a dict of aggregatable columns from all columns or columns list
+        Return a dict of aggregatable field_names from all field_names or field_names list
         {'customer_full_name': 'customer_full_name.keyword', ...}
 
-        Logic here is that column names are '_source' fields and keyword fields
+        Logic here is that field_name names are '_source' fields and keyword fields
         may be nested beneath the field. E.g.
         customer_full_name: text
         customer_full_name.keyword: keyword
@@ -424,28 +424,28 @@ class Mappings:
         dict
             e.g. {'customer_full_name': 'customer_full_name.keyword', ...}
         """
-        if columns is None:
-            columns = self.source_fields()
+        if field_names is None:
+            field_names = self.source_fields()
 
         aggregatables = {}
 
-        for column in columns:
-            capabilities = self.field_capabilities(column)
+        for field_name in field_names:
+            capabilities = self.field_capabilities(field_name)
             if capabilities['aggregatable']:
-                aggregatables[column] = column
+                aggregatables[field_name] = field_name
             else:
-                # Try 'column.keyword'
-                column_keyword = column + '.keyword'
-                capabilities = self.field_capabilities(column_keyword)
+                # Try 'field_name.keyword'
+                field_name_keyword = field_name + '.keyword'
+                capabilities = self.field_capabilities(field_name_keyword)
                 if capabilities['aggregatable']:
-                    aggregatables[column_keyword] = column
+                    aggregatables[field_name_keyword] = field_name
                 else:
                     # Aggregations not supported for this field
-                    raise ValueError("Aggregations not supported for ", column)
+                    raise ValueError("Aggregations not supported for ", field_name)
 
         return aggregatables
 
-    def numeric_source_fields(self, columns, include_bool=True):
+    def numeric_source_fields(self, field_names, include_bool=True):
         """
         Returns
         -------
@@ -461,10 +461,10 @@ class Mappings:
             df = self._mappings_capabilities[(self._mappings_capabilities._source == True) &
                                                ((self._mappings_capabilities.pd_dtype == 'int64') |
                                                 (self._mappings_capabilities.pd_dtype == 'float64'))]
-        # if columns exists, filter index with columns
-        if columns is not None:
-            # reindex adds NA for non-existing columns (non-numeric), so drop these after reindex
-            df = df.reindex(columns)
+        # if field_names exists, filter index with field_names
+        if field_names is not None:
+            # reindex adds NA for non-existing field_names (non-numeric), so drop these after reindex
+            df = df.reindex(field_names)
             df.dropna(inplace=True)
 
         # return as list
@@ -488,16 +488,16 @@ class Mappings:
         """
         return len(self.source_fields())
 
-    def dtypes(self, columns=None):
+    def dtypes(self, field_names=None):
         """
         Returns
         -------
         dtypes: pd.Series
             Source field name + pd_dtype
         """
-        if columns is not None:
+        if field_names is not None:
             return pd.Series(
-                {key: self._source_field_pd_dtypes[key] for key in columns})
+                {key: self._source_field_pd_dtypes[key] for key in field_names})
 
         return pd.Series(self._source_field_pd_dtypes)
 
diff --git a/eland/ndframe.py b/eland/ndframe.py
index 31a2c40..c98dd22 100644
--- a/eland/ndframe.py
+++ b/eland/ndframe.py
@@ -49,9 +49,7 @@ class NDFrame:
             A reference to a Elasticsearch python client
         """
         if query_compiler is None:
-            query_compiler = ElandQueryCompiler(client=client,
-                                                index_pattern=index_pattern,
-                                                columns=columns,
+            query_compiler = ElandQueryCompiler(client=client, index_pattern=index_pattern, field_names=columns,
                                                 index_field=index_field)
         self._query_compiler = query_compiler
 
diff --git a/eland/operations.py b/eland/operations.py
index 7f69446..aa9ba2f 100644
--- a/eland/operations.py
+++ b/eland/operations.py
@@ -12,7 +12,7 @@ class Operations:
     A collector of the queries and selectors we apply to queries to return the appropriate results.
 
     For example,
-        - a list of the columns in the DataFrame (a subset of columns in the index)
+        - a list of the field_names in the DataFrame (a subset of field_names in the index)
         - a size limit on the results (e.g. for head(n=5))
         - a query to filter the results (e.g. df.A > 10)
 
@@ -66,26 +66,34 @@ class Operations:
         task = ('tail', (index.sort_field, n))
         self._tasks.append(task)
 
-    def set_columns(self, columns):
-        # Setting columns at different phases of the task list may result in different
-        # operations. So instead of setting columns once, set when it happens in call chain
-        if type(columns) is not list:
-            columns = list(columns)
+    def arithmetic_op_fields(self, field_name, op_name, left_field, right_field):
+        task = ('arithmetic_op_fields', (field_name, (op_name, (left_field, right_field))))
+
+        # Set this as a column we want to retrieve
+        self.set_field_names([field_name])
 
-        # TODO - column renaming
-        # TODO - validate we are setting columns to a subset of last columns?
-        task = ('columns', columns)
         self._tasks.append(task)
-        # Iterate backwards through task list looking for last 'columns' task
+
+    def set_field_names(self, field_names):
+        # Setting field_names at different phases of the task list may result in different
+        # operations. So instead of setting field_names once, set when it happens in call chain
+        if type(field_names) is not list:
+            field_names = list(field_names)
+
+        # TODO - field_name renaming
+        # TODO - validate we are setting field_names to a subset of last field_names?
+        task = ('field_names', field_names)
+        self._tasks.append(task)
+        # Iterate backwards through task list looking for last 'field_names' task
         for task in reversed(self._tasks):
-            if task[0] == 'columns':
+            if task[0] == 'field_names':
                 return task[1]
         return None
 
-    def get_columns(self):
-        # Iterate backwards through task list looking for last 'columns' task
+    def get_field_names(self):
+        # Iterate backwards through task list looking for last 'field_names' task
         for task in reversed(self._tasks):
-            if task[0] == 'columns':
+            if task[0] == 'field_names':
                 return task[1]
         return None
 
@@ -103,8 +111,8 @@ class Operations:
                                       "not supported {0} {1}"
                                       .format(query_params, post_processing))
 
-        # Only return requested columns
-        fields = query_compiler.columns
+        # Only return requested field_names
+        fields = query_compiler.field_names
 
         counts = {}
         for field in fields:
@@ -143,13 +151,13 @@ class Operations:
         Parameters
         ----------
         field_types: str, default None
-            if `aggregatable` use only columns whose fields in elasticseach are aggregatable.
+            if `aggregatable` use only field_names whose fields in elasticseach are aggregatable.
             If `None`, use only numeric fields.
 
         Returns
         -------
         pandas.Series
-            Series containing results of `func` applied to the column(s)
+            Series containing results of `func` applied to the field_name(s)
         """
         query_params, post_processing = self._resolve_tasks()
 
@@ -157,7 +165,7 @@ class Operations:
         if size is not None:
             raise NotImplementedError("Can not count field matches if size is set {}".format(size))
 
-        columns = self.get_columns()
+        field_names = self.get_field_names()
 
         body = Query(query_params['query'])
 
@@ -165,9 +173,9 @@ class Operations:
         # therefore we include an optional all parameter on operations
         # that call _metric_aggs
         if field_types=='aggregatable':
-            source_fields = query_compiler._mappings.aggregatable_columns(columns)
+            source_fields = query_compiler._mappings.aggregatable_field_names(field_names)
         else:
-            source_fields = query_compiler._mappings.numeric_source_fields(columns)
+            source_fields = query_compiler._mappings.numeric_source_fields(field_names)
 
         for field in source_fields:
             body.metric_aggs(field, func, field)
@@ -209,7 +217,7 @@ class Operations:
         Returns
         -------
         pandas.Series
-            Series containing results of `func` applied to the column(s)
+            Series containing results of `func` applied to the field_name(s)
         """
         query_params, post_processing = self._resolve_tasks()
 
@@ -217,14 +225,14 @@ class Operations:
         if size is not None:
             raise NotImplementedError("Can not count field matches if size is set {}".format(size))
 
-        columns = self.get_columns()
+        field_names = self.get_field_names()
 
-        # Get just aggregatable columns
-        aggregatable_columns = query_compiler._mappings.aggregatable_columns(columns)
+        # Get just aggregatable field_names
+        aggregatable_field_names = query_compiler._mappings.aggregatable_field_names(field_names)
 
         body = Query(query_params['query'])
 
-        for field in aggregatable_columns.keys():
+        for field in aggregatable_field_names.keys():
             body.terms_aggs(field, func, field, es_size=es_size)
 
         response = query_compiler._client.search(
@@ -234,12 +242,12 @@ class Operations:
 
         results = {}
 
-        for key, value in aggregatable_columns.items():
-            for bucket in response['aggregations'][columns[0]]['buckets']:
+        for key, value in aggregatable_field_names.items():
+            for bucket in response['aggregations'][field_names[0]]['buckets']:
                 results[bucket['key']] = bucket['doc_count']
 
         try:
-            name = columns[0]
+            name = field_names[0]
         except IndexError:
             name = None
 
@@ -248,16 +256,16 @@ class Operations:
         return s
 
     def _hist_aggs(self, query_compiler, num_bins):
-        # Get histogram bins and weights for numeric columns
+        # Get histogram bins and weights for numeric field_names
         query_params, post_processing = self._resolve_tasks()
 
         size = self._size(query_params, post_processing)
         if size is not None:
             raise NotImplementedError("Can not count field matches if size is set {}".format(size))
 
-        columns = self.get_columns()
+        field_names = self.get_field_names()
 
-        numeric_source_fields = query_compiler._mappings.numeric_source_fields(columns)
+        numeric_source_fields = query_compiler._mappings.numeric_source_fields(field_names)
 
         body = Query(query_params['query'])
 
@@ -331,7 +339,7 @@ class Operations:
         Pandas supports a lot of options here, and these options generally work on text and numerics in pandas.
         Elasticsearch has metric aggs and terms aggs so will have different behaviour.
 
-        Pandas aggs that return columns (as opposed to transformed rows):
+        Pandas aggs that return field_names (as opposed to transformed rows):
 
         all
         any
@@ -398,14 +406,14 @@ class Operations:
         if size is not None:
             raise NotImplementedError("Can not count field matches if size is set {}".format(size))
 
-        columns = self.get_columns()
+        field_names = self.get_field_names()
 
         body = Query(query_params['query'])
 
         # convert pandas aggs to ES equivalent
         es_aggs = self._map_pd_aggs_to_es_aggs(pd_aggs)
 
-        for field in columns:
+        for field in field_names:
             for es_agg in es_aggs:
                 # If we have multiple 'extended_stats' etc. here we simply NOOP on 2nd call
                 if isinstance(es_agg, tuple):
@@ -427,7 +435,7 @@ class Operations:
         """
         results = {}
 
-        for field in columns:
+        for field in field_names:
             values = list()
             for es_agg in es_aggs:
                 if isinstance(es_agg, tuple):
@@ -448,9 +456,9 @@ class Operations:
         if size is not None:
             raise NotImplementedError("Can not count field matches if size is set {}".format(size))
 
-        columns = self.get_columns()
+        field_names = self.get_field_names()
 
-        numeric_source_fields = query_compiler._mappings.numeric_source_fields(columns, include_bool=False)
+        numeric_source_fields = query_compiler._mappings.numeric_source_fields(field_names, include_bool=False)
 
         # for each field we compute:
         # count, mean, std, min, 25%, 50%, 75%, max
@@ -535,10 +543,15 @@ class Operations:
 
         size, sort_params = Operations._query_params_to_size_and_sort(query_params)
 
-        body = Query(query_params['query'])
+        script_fields = query_params['query_script_fields']
+        query = Query(query_params['query'])
 
-        # Only return requested columns
-        columns = self.get_columns()
+        body = query.to_search_body()
+        if script_fields is not None:
+            body['script_fields'] = script_fields
+
+        # Only return requested field_names
+        field_names = self.get_field_names()
 
         es_results = None
 
@@ -551,14 +564,14 @@ class Operations:
                     index=query_compiler._index_pattern,
                     size=size,
                     sort=sort_params,
-                    body=body.to_search_body(),
-                    _source=columns)
+                    body=body,
+                    _source=field_names)
         else:
             is_scan = True
             es_results = query_compiler._client.scan(
                 index=query_compiler._index_pattern,
-                query=body.to_search_body(),
-                _source=columns)
+                query=body,
+                _source=field_names)
             # create post sort
             if sort_params is not None:
                 post_processing.append(self._sort_params_to_postprocessing(sort_params))
@@ -575,9 +588,9 @@ class Operations:
             df = self._apply_df_post_processing(df, post_processing)
             collector.collect(df)
 
-    def iloc(self, index, columns):
-        # index and columns are indexers
-        task = ('iloc', (index, columns))
+    def iloc(self, index, field_names):
+        # index and field_names are indexers
+        task = ('iloc', (index, field_names))
         self._tasks.append(task)
 
     def index_count(self, query_compiler, field):
@@ -691,13 +704,13 @@ class Operations:
                     df = df.sort_values(sort_field, False)
             elif action[0] == 'iloc':
                 index_indexer = action[1][0]
-                column_indexer = action[1][1]
+                field_name_indexer = action[1][1]
                 if index_indexer is None:
                     index_indexer = slice(None)
-                if column_indexer is None:
-                    column_indexer = slice(None)
-                df = df.iloc[index_indexer, column_indexer]
-            # columns could be in here (and we ignore it)
+                if field_name_indexer is None:
+                    field_name_indexer = slice(None)
+                df = df.iloc[index_indexer, field_name_indexer]
+            # field_names could be in here (and we ignore it)
 
         return df
 
@@ -710,6 +723,7 @@ class Operations:
                         "query_sort_order": None,
                         "query_size": None,
                         "query_fields": None,
+                        "query_script_fields": None,
                         "query": Query()}
 
         post_processing = []
@@ -727,6 +741,8 @@ class Operations:
                 query_params, post_processing = self._resolve_query_terms(task, query_params, post_processing)
             elif task[0] == 'boolean_filter':
                 query_params, post_processing = self._resolve_boolean_filter(task, query_params, post_processing)
+            elif task[0] == 'arithmetic_op_fields':
+                query_params, post_processing = self._resolve_arithmetic_op_fields(task, query_params, post_processing)
             else:  # a lot of operations simply post-process the dataframe - put these straight through
                 query_params, post_processing = self._resolve_post_processing_task(task, query_params, post_processing)
 
@@ -858,9 +874,44 @@ class Operations:
 
         return query_params, post_processing
 
+    def _resolve_arithmetic_op_fields(self, item, query_params, post_processing):
+        # task = ('arithmetic_op_fields', (field_name, (op_name, (left_field, right_field))))
+        field_name = item[1][0]
+        op_name = item[1][1][0]
+        left_field = item[1][1][1][0]
+        right_field = item[1][1][1][1]
+
+        """
+        (if op_name = 'truediv')
+        
+        "script_fields": {
+            "field_name": {
+              "script": {
+                "source": "doc[left_field].value / doc[right_field].value"
+               }
+            }
+        }
+        """
+        if op_name == 'truediv':
+            op = '/'
+        else:
+            raise NotImplementedError("Not implemented operation '{0}'".format(op_name))
+
+        source = "doc['{0}'].value {1} doc['{2}'].value".format(left_field, op, right_field)
+
+        if query_params['query_script_fields'] is None:
+            query_params['query_script_fields'] = {}
+        query_params['query_script_fields'][field_name] = {
+            'script': {
+                'source': source
+            }
+        }
+
+        return query_params, post_processing
+
     def _resolve_post_processing_task(self, item, query_params, post_processing):
         # Just do this in post-processing
-        if item[0] != 'columns':
+        if item[0] != 'field_names':
             post_processing.append(item)
 
         return query_params, post_processing
@@ -885,11 +936,11 @@ class Operations:
 
         query_params, post_processing = self._resolve_tasks()
         size, sort_params = Operations._query_params_to_size_and_sort(query_params)
-        columns = self.get_columns()
+        field_names = self.get_field_names()
 
         buf.write(" size: {0}\n".format(size))
         buf.write(" sort_params: {0}\n".format(sort_params))
-        buf.write(" columns: {0}\n".format(columns))
+        buf.write(" field_names: {0}\n".format(field_names))
         buf.write(" post_processing: {0}\n".format(post_processing))
 
     def update_query(self, boolean_filter):
diff --git a/eland/query.py b/eland/query.py
index 80a5161..72e9129 100644
--- a/eland/query.py
+++ b/eland/query.py
@@ -15,10 +15,12 @@ class Query:
     def __init__(self, query=None):
         if query is None:
             self._query = BooleanFilter()
+            self._script_fields = {}
             self._aggs = {}
         else:
             # Deep copy the incoming query so we can change it
             self._query = deepcopy(query._query)
+            self._script_fields = deepcopy(query._script_fields)
             self._aggs = deepcopy(query._aggs)
 
     def exists(self, field, must=True):
@@ -157,5 +159,14 @@ class Query:
         else:
             self._query = self._query & boolean_filter
 
+    def arithmetic_op_fields(self, op_name, left_field, right_field):
+        if self._script_fields.empty():
+            body = None
+        else:
+            body = {"query": self._script_fields.build()}
+
+        return body
+
     def __repr__(self):
         return repr(self.to_search_body())
+
diff --git a/eland/query_compiler.py b/eland/query_compiler.py
index 102221f..e94e605 100644
--- a/eland/query_compiler.py
+++ b/eland/query_compiler.py
@@ -38,12 +38,8 @@ class ElandQueryCompiler:
     A way to mitigate this would be to post process this drop - TODO
     """
 
-    def __init__(self,
-                 client=None,
-                 index_pattern=None,
-                 columns=None,
-                 index_field=None,
-                 operations=None):
+    def __init__(self, client=None, index_pattern=None, field_names=None, index_field=None, operations=None,
+                 name_mapper=None):
         self._client = Client(client)
         self._index_pattern = index_pattern
 
@@ -58,29 +54,53 @@ class ElandQueryCompiler:
         else:
             self._operations = operations
 
-        if columns is not None:
-            self.columns = columns
+        if field_names is not None:
+            self.field_names = field_names
+
+        if name_mapper is None:
+            self._name_mapper = ElandQueryCompiler.DisplayNameToFieldNameMapper()
+        else:
+            self._name_mapper = name_mapper
 
     def _get_index(self):
         return self._index
 
+    def _get_field_names(self):
+        field_names = self._operations.get_field_names()
+        if field_names is None:
+            # default to all
+            field_names = self._mappings.source_fields()
+
+        return pd.Index(field_names)
+
+    def _set_field_names(self, field_names):
+        self._operations.set_field_names(field_names)
+
+    field_names = property(_get_field_names, _set_field_names)
+
     def _get_columns(self):
-        columns = self._operations.get_columns()
+        columns = self._operations.get_field_names()
         if columns is None:
             # default to all
             columns = self._mappings.source_fields()
 
+        # map renames
+        columns = self._name_mapper.field_to_display_names(columns)
+
         return pd.Index(columns)
 
     def _set_columns(self, columns):
-        self._operations.set_columns(columns)
+        # map renames
+        columns = self._name_mapper.display_to_field_names(columns)
+
+        self._operations.set_field_names(columns)
 
     columns = property(_get_columns, _set_columns)
     index = property(_get_index)
 
     @property
     def dtypes(self):
-        columns = self._operations.get_columns()
+        columns = self._operations.get_field_names()
 
         return self._mappings.dtypes(columns)
 
@@ -194,6 +214,12 @@ class ElandQueryCompiler:
 
             row = hit['_source']
 
+            # script_fields appear in 'fields'
+            if 'fields' in hit:
+                fields = hit['fields']
+                for key, value in fields.items():
+                    row[key] = value
+
             # get index value - can be _id or can be field value in source
             if self._index.is_source_field:
                 index_field = row[self._index.index_field]
@@ -221,6 +247,10 @@ class ElandQueryCompiler:
             is_source_field, pd_dtype = self._mappings.source_field_pd_dtype(missing)
             df[missing] = pd.Series(dtype=pd_dtype)
 
+        # Rename columns
+        if not self._name_mapper.empty:
+            df.rename(columns=self._name_mapper.display_names_mapper(), inplace=True)
+
         # Sort columns in mapping order
         df = df[self.columns]
 
@@ -267,6 +297,8 @@ class ElandQueryCompiler:
                     out[field_name].append(x)
                 else:
                     out[field_name] = x
+            else:
+                out[name[:-1]] = x
 
         flatten(y)
 
@@ -307,13 +339,16 @@ class ElandQueryCompiler:
         return df
 
     def copy(self):
-        return ElandQueryCompiler(
-            client=self._client,
-            index_pattern=self._index_pattern,
-            columns=None,  # columns are embedded in operations
-            index_field=self._index.index_field,
-            operations=self._operations.copy()
-        )
+        return ElandQueryCompiler(client=self._client, index_pattern=self._index_pattern, field_names=None,
+                                  index_field=self._index.index_field, operations=self._operations.copy(),
+                                  name_mapper=self._name_mapper.copy())
+
+    def rename(self, renames):
+        result = self.copy()
+
+        result._name_mapper.rename_display_name(renames)
+
+        return result
 
     def head(self, n):
         result = self.copy()
@@ -364,14 +399,7 @@ class ElandQueryCompiler:
         if numeric:
             raise NotImplementedError("Not implemented yet...")
 
-        result._operations.set_columns(list(key))
-
-        return result
-
-    def view(self, index=None, columns=None):
-        result = self.copy()
-
-        result._operations.iloc(index, columns)
+        result._operations.set_field_names(list(key))
 
         return result
 
@@ -382,7 +410,7 @@ class ElandQueryCompiler:
         if columns is not None:
             # columns is a pandas.Index so we can use pandas drop feature
             new_columns = self.columns.drop(columns)
-            result._operations.set_columns(new_columns.to_list())
+            result._operations.set_field_names(new_columns.to_list())
 
         if index is not None:
             result._operations.drop_index_values(self, self.index.index_field, index)
@@ -433,3 +461,141 @@ class ElandQueryCompiler:
 
         return result
 
+    def check_arithmetics(self, right):
+        """
+        Compare 2 query_compilers to see if arithmetic operations can be performed by the NDFrame object.
+
+        This does very basic comparisons and ignores some of the complexities of incompatible task lists
+
+        Raises exception if incompatible
+
+        Parameters
+        ----------
+        right: ElandQueryCompiler
+            The query compiler to compare self to
+
+        Raises
+        ------
+        TypeError, ValueError
+            If arithmetic operations aren't possible
+        """
+        if not isinstance(right, ElandQueryCompiler):
+            raise TypeError(
+                "Incompatible types "
+                "{0} != {1}".format(type(self), type(right))
+            )
+
+        if self._client._es != right._client._es:
+            raise ValueError(
+                "Can not perform arithmetic operations across different clients"
+                "{0} != {1}".format(self._client._es, right._client._es)
+            )
+
+        if self._index.index_field != right._index.index_field:
+            raise ValueError(
+                "Can not perform arithmetic operations across different index fields "
+                "{0} != {1}".format(self._index.index_field, right._index.index_field)
+            )
+
+        if self._index_pattern != right._index_pattern:
+            raise ValueError(
+                "Can not perform arithmetic operations across different index patterns"
+                "{0} != {1}".format(self._index_pattern, right._index_pattern)
+            )
+
+    def arithmetic_op_fields(self, field_name, op, left_field, right_field):
+        result = self.copy()
+
+        result._operations.arithmetic_op_fields(field_name, op, left_field, right_field)
+
+        return result
+
+    """
+    Internal class to deal with column renaming and script_fields
+    """
+    class DisplayNameToFieldNameMapper:
+        def __init__(self,
+                     field_to_display_names=None,
+                     display_to_field_names=None):
+
+            if field_to_display_names is not None:
+                self._field_to_display_names = field_to_display_names
+            else:
+                self._field_to_display_names = dict()
+
+            if display_to_field_names is not None:
+                self._display_to_field_names = display_to_field_names
+            else:
+                self._display_to_field_names = dict()
+
+        def rename_display_name(self, renames):
+            for current_display_name, new_display_name in renames.items():
+                if current_display_name in self._display_to_field_names:
+                    # has been renamed already - update name
+                    field_name = self._display_to_field_names[current_display_name]
+                    del self._display_to_field_names[current_display_name]
+                    del self._field_to_display_names[field_name]
+                    self._display_to_field_names[new_display_name] = field_name
+                    self._field_to_display_names[field_name] = new_display_name
+                else:
+                    # new rename - assume 'current_display_name' is 'field_name'
+                    field_name = current_display_name
+
+                    # if field_name is already mapped ignore
+                    if field_name not in self._field_to_display_names:
+                        self._display_to_field_names[new_display_name] = field_name
+                        self._field_to_display_names[field_name] = new_display_name
+
+        def field_names_to_list(self):
+            return self._field_to_display_names.keys()
+
+        def display_names_to_list(self):
+            return self._display_to_field_names.keys()
+
+        # Return mapper values as dict
+        def display_names_mapper(self):
+            return self._field_to_display_names
+
+        @property
+        def empty(self):
+            return not self._display_to_field_names
+
+        def field_to_display_names(self, field_names):
+            if self.empty:
+                return field_names
+
+            display_names = []
+
+            for field_name in field_names:
+                if field_name in self._field_to_display_names:
+                    display_name = self._field_to_display_names[field_name]
+                else:
+                    display_name = field_name
+                display_names.append(display_name)
+
+            return display_names
+
+        def display_to_field_names(self, display_names):
+            if self.empty:
+                return display_names
+
+            field_names = []
+
+            for display_name in display_names:
+                if display_name in self._display_to_field_names:
+                    field_name = self._display_to_field_names[display_name]
+                else:
+                    field_name = display_name
+                field_names.append(field_name)
+
+            return field_names
+
+        def __constructor__(self, *args, **kwargs):
+            return type(self)(*args, **kwargs)
+
+        def copy(self):
+            return self.__constructor__(
+                field_to_display_names=self._field_to_display_names,
+                display_to_field_names = self._display_to_field_names
+            )
+
diff --git a/eland/series.py b/eland/series.py
index 6318028..9c96003 100644
--- a/eland/series.py
+++ b/eland/series.py
@@ -15,7 +15,7 @@ Based on NDFrame which underpins eland.1DataFrame
 
 """
 
-import warnings
+from io import StringIO
 
 import pandas as pd
 
@@ -98,6 +98,20 @@ class Series(NDFrame):
 
     name = property(_get_name)
 
+    def rename(self, new_name):
+        """
+        ONLY COLUMN rename supported
+
+        Parameters
+        ----------
+        new_name
+
+        Returns
+        -------
+
+        """
+        return Series(query_compiler=self._query_compiler.rename({self.name: new_name}))
+
     def head(self, n=5):
         return Series(query_compiler=self._query_compiler.head(n))
 
@@ -141,7 +155,7 @@ class Series(NDFrame):
         """
         if not isinstance(es_size, int):
             raise TypeError("es_size must be a positive integer.")
-        if not es_size>0:
+        if not es_size > 0:
             raise ValueError("es_size must be a positive integer.")
 
         return self._query_compiler.value_counts(es_size)
@@ -276,3 +290,35 @@ class Series(NDFrame):
 
         """
         return 1
+
+    def info_es(self):
+        buf = StringIO()
+
+        super()._info_es(buf)
+
+        return buf.getvalue()
+
+    def __truediv__(self, right):
+        return self.truediv(right)
+
+    def truediv(self, right):
+        """
+        return a / b
+
+        a & b == Series
+            a & b must share same eland.Client, index_pattern and index_field
+        """
+        if isinstance(right, Series):
+            # Check compatibility
+            self._query_compiler.check_arithmetics(right._query_compiler)
+
+            field_name = "{0}_{1}_{2}".format(self.name, "truediv", right.name)
+
+            # Compatible, so create new Series
+            return Series(query_compiler=self._query_compiler.arithmetic_op_fields(
+                field_name, 'truediv', self.name, right.name))
+        else:
+            raise TypeError(
+                "Can only perform arithmetic operation on selected types "
+                "{0} != {1}".format(type(self), type(right))
+            )
diff --git a/eland/tests/client/__init__.py b/eland/tests/client/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/eland/tests/client/test_eq_pytest.py b/eland/tests/client/test_eq_pytest.py
new file mode 100644
index 0000000..332d6f4
--- /dev/null
+++ b/eland/tests/client/test_eq_pytest.py
@@ -0,0 +1,28 @@
+# File called _pytest for PyCharm compatability
+from elasticsearch import Elasticsearch
+
+import eland as ed
+from eland.tests.common import TestData
+
+import pytest
+
+
+class TestClientEq(TestData):
+
+    def test_self_eq(self):
+        es = Elasticsearch('localhost')
+
+        client = ed.Client(es)
+
+        assert client != es
+
+        assert client == client
+
+    def test_non_self_ne(self):
+        es1 = Elasticsearch('localhost')
+        es2 = Elasticsearch('localhost')
+
+        client1 = ed.Client(es1)
+        client2 = ed.Client(es2)
+
+        assert client1 != client2
diff --git a/eland/tests/common.py b/eland/tests/common.py
index 107b5ab..6549d73 100644
--- a/eland/tests/common.py
+++ b/eland/tests/common.py
@@ -80,7 +80,7 @@ def assert_eland_frame_equal(left, right):
     assert_frame_equal(left._to_pandas(), right._to_pandas())
 
 
-def assert_pandas_eland_series_equal(left, right):
+def assert_pandas_eland_series_equal(left, right, check_less_precise=False):
     if not isinstance(left, pd.Series):
         raise AssertionError("Expected type {exp_type}, found {act_type} instead".format(
             exp_type='pd.Series', act_type=type(left)))
@@ -90,4 +90,4 @@ def assert_pandas_eland_series_equal(left, right):
             exp_type='ed.Series', act_type=type(right)))
 
     # Use pandas tests to check similarity
-    assert_series_equal(left, right._to_pandas())
+    assert_series_equal(left, right._to_pandas(), check_less_precise=check_less_precise)
diff --git a/eland/tests/mappings/test_aggregatables_pytest.py b/eland/tests/mappings/test_aggregatables_pytest.py
index 8d12f17..9d27ba7 100644
--- a/eland/tests/mappings/test_aggregatables_pytest.py
+++ b/eland/tests/mappings/test_aggregatables_pytest.py
@@ -8,7 +8,7 @@ class TestMappingsAggregatables(TestData):
     def test_ecommerce_all_aggregatables(self):
         ed_ecommerce = self.ed_ecommerce()
 
-        aggregatables = ed_ecommerce._query_compiler._mappings.aggregatable_columns()
+        aggregatables = ed_ecommerce._query_compiler._mappings.aggregatable_field_names()
 
         expected = {'category.keyword': 'category',
          'currency': 'currency',
@@ -67,6 +67,6 @@ class TestMappingsAggregatables(TestData):
                     'customer_first_name.keyword': 'customer_first_name',
                     'type': 'type', 'user': 'user'}
 
-        aggregatables = ed_ecommerce._query_compiler._mappings.aggregatable_columns(expected.values())
+        aggregatables = ed_ecommerce._query_compiler._mappings.aggregatable_field_names(expected.values())
 
         assert expected == aggregatables
diff --git a/eland/tests/mappings/test_dtypes_pytest.py b/eland/tests/mappings/test_dtypes_pytest.py
index 43d3e3e..e467e9a 100644
--- a/eland/tests/mappings/test_dtypes_pytest.py
+++ b/eland/tests/mappings/test_dtypes_pytest.py
@@ -21,6 +21,6 @@ class TestMappingsDtypes(TestData):
         pd_flights = self.pd_flights()[['Carrier', 'AvgTicketPrice', 'Cancelled']]
 
         pd_dtypes = pd_flights.dtypes
-        ed_dtypes = ed_flights._query_compiler._mappings.dtypes(columns=['Carrier', 'AvgTicketPrice', 'Cancelled'])
+        ed_dtypes = ed_flights._query_compiler._mappings.dtypes(field_names=['Carrier', 'AvgTicketPrice', 'Cancelled'])
 
         assert_series_equal(pd_dtypes, ed_dtypes)
diff --git a/eland/tests/mappings/test_numeric_source_fields_pytest.py b/eland/tests/mappings/test_numeric_source_fields_pytest.py
index 9611a1f..a63e94d 100644
--- a/eland/tests/mappings/test_numeric_source_fields_pytest.py
+++ b/eland/tests/mappings/test_numeric_source_fields_pytest.py
@@ -13,13 +13,13 @@ class TestMappingsNumericSourceFields(TestData):
         ed_flights = self.ed_flights()
         pd_flights = self.pd_flights()
 
-        ed_numeric = ed_flights._query_compiler._mappings.numeric_source_fields(columns=None, include_bool=False)
+        ed_numeric = ed_flights._query_compiler._mappings.numeric_source_fields(field_names=None, include_bool=False)
         pd_numeric = pd_flights.select_dtypes(include=np.number)
 
         assert pd_numeric.columns.to_list() == ed_numeric
 
     def test_ecommerce_selected_non_numeric_source_fields(self):
-        columns = ['category', 'currency', 'customer_birth_date', 'customer_first_name', 'user']
+        field_names = ['category', 'currency', 'customer_birth_date', 'customer_first_name', 'user']
         """
         Note: non of there are numeric
         category                       object
@@ -29,16 +29,16 @@ class TestMappingsNumericSourceFields(TestData):
         user                           object
         """
 
-        ed_ecommerce = self.ed_ecommerce()[columns]
-        pd_ecommerce = self.pd_ecommerce()[columns]
+        ed_ecommerce = self.ed_ecommerce()[field_names]
+        pd_ecommerce = self.pd_ecommerce()[field_names]
 
-        ed_numeric = ed_ecommerce._query_compiler._mappings.numeric_source_fields(columns=columns, include_bool=False)
+        ed_numeric = ed_ecommerce._query_compiler._mappings.numeric_source_fields(field_names=field_names, include_bool=False)
         pd_numeric = pd_ecommerce.select_dtypes(include=np.number)
 
         assert pd_numeric.columns.to_list() == ed_numeric
 
     def test_ecommerce_selected_mixed_numeric_source_fields(self):
-        columns = ['category', 'currency', 'customer_birth_date', 'customer_first_name', 'total_quantity', 'user']
+        field_names = ['category', 'currency', 'customer_birth_date', 'customer_first_name', 'total_quantity', 'user']
 
         """
         Note: one is numeric
@@ -50,16 +50,16 @@ class TestMappingsNumericSourceFields(TestData):
         user                           object
         """
 
-        ed_ecommerce = self.ed_ecommerce()[columns]
-        pd_ecommerce = self.pd_ecommerce()[columns]
+        ed_ecommerce = self.ed_ecommerce()[field_names]
+        pd_ecommerce = self.pd_ecommerce()[field_names]
 
-        ed_numeric = ed_ecommerce._query_compiler._mappings.numeric_source_fields(columns=columns, include_bool=False)
+        ed_numeric = ed_ecommerce._query_compiler._mappings.numeric_source_fields(field_names=field_names, include_bool=False)
         pd_numeric = pd_ecommerce.select_dtypes(include=np.number)
 
         assert pd_numeric.columns.to_list() == ed_numeric
 
     def test_ecommerce_selected_all_numeric_source_fields(self):
-        columns = ['total_quantity', 'taxful_total_price', 'taxless_total_price']
+        field_names = ['total_quantity', 'taxful_total_price', 'taxless_total_price']
 
         """
         Note: all are numeric
@@ -68,10 +68,10 @@ class TestMappingsNumericSourceFields(TestData):
         taxless_total_price    float64
         """
 
-        ed_ecommerce = self.ed_ecommerce()[columns]
-        pd_ecommerce = self.pd_ecommerce()[columns]
+        ed_ecommerce = self.ed_ecommerce()[field_names]
+        pd_ecommerce = self.pd_ecommerce()[field_names]
 
-        ed_numeric = ed_ecommerce._query_compiler._mappings.numeric_source_fields(columns=columns, include_bool=False)
+        ed_numeric = ed_ecommerce._query_compiler._mappings.numeric_source_fields(field_names=field_names, include_bool=False)
         pd_numeric = pd_ecommerce.select_dtypes(include=np.number)
 
         assert pd_numeric.columns.to_list() == ed_numeric
diff --git a/eland/tests/query_compiler/test_rename_pytest.py b/eland/tests/query_compiler/test_rename_pytest.py
new file mode 100644
index 0000000..3948044
--- /dev/null
+++ b/eland/tests/query_compiler/test_rename_pytest.py
@@ -0,0 +1,75 @@
+# File called _pytest for PyCharm compatability
+import pandas as pd
+
+from pandas.util.testing import assert_series_equal
+
+from eland import ElandQueryCompiler
+from eland.tests.common import TestData
+
+
+class TestQueryCompilerRename(TestData):
+
+    def test_query_compiler_basic_rename(self):
+        field_names = []
+        display_names = []
+
+        mapper = ElandQueryCompiler.DisplayNameToFieldNameMapper()
+
+        assert field_names == mapper.field_names_to_list()
+        assert display_names == mapper.display_names_to_list()
+
+        field_names = ['a']
+        display_names = ['A']
+        update_A = {'a' : 'A'}
+        mapper.rename_display_name(update_A)
+
+        assert field_names == mapper.field_names_to_list()
+        assert display_names == mapper.display_names_to_list()
+
+        field_names = ['a', 'b']
+        display_names = ['A', 'B']
+
+        update_B = {'b' : 'B'}
+        mapper.rename_display_name(update_B)
+
+        assert field_names == mapper.field_names_to_list()
+        assert display_names == mapper.display_names_to_list()
+
+        field_names = ['a', 'b']
+        display_names = ['AA', 'B']
+
+        update_AA = {'A' : 'AA'}
+        mapper.rename_display_name(update_AA)
+
+        assert field_names == mapper.field_names_to_list()
+        assert display_names == mapper.display_names_to_list()
+
+    def test_query_compiler_basic_rename_columns(self):
+        columns = ['a', 'b', 'c', 'd']
+
+        mapper = ElandQueryCompiler.DisplayNameToFieldNameMapper()
+
+        display_names = ['A', 'b', 'c', 'd']
+        update_A = {'a' : 'A'}
+        mapper.rename_display_name(update_A)
+
+        assert display_names == mapper.display_names(columns)
+
+        # Invalid update
+        display_names = ['A', 'b', 'c', 'd']
+        update_ZZ = {'a' : 'ZZ'}
+        mapper.rename_display_name(update_ZZ)
+
+        assert display_names == mapper.display_names(columns)
+
+        display_names = ['AA', 'b', 'c', 'd']
+        update_AA = {'A' : 'AA'} # already renamed to 'A'
+        mapper.rename_display_name(update_AA)
+
+        assert display_names == mapper.display_names(columns)
+
+        display_names = ['AA', 'b', 'C', 'd']
+        update_AA_C = {'a' : 'AA', 'c' : 'C'} # 'a' rename ignored
+        mapper.rename_display_name(update_AA_C)
+
+        assert display_names == mapper.display_names(columns)
diff --git a/eland/tests/series/test_arithmetics_pytest.py b/eland/tests/series/test_arithmetics_pytest.py
new file mode 100644
index 0000000..589853c
--- /dev/null
+++ b/eland/tests/series/test_arithmetics_pytest.py
@@ -0,0 +1,50 @@
+# File called _pytest for PyCharm compatability
+import eland as ed
+from eland.tests.common import TestData, assert_pandas_eland_series_equal
+from pandas.util.testing import assert_series_equal
+import pytest
+
+
+class TestSeriesArithmetics(TestData):
+
+    def test_ecommerce_series_invalid_div(self):
+        pd_df = self.pd_ecommerce()
+        ed_df = self.ed_ecommerce()
+
+        # eland / pandas == error
+        with pytest.raises(TypeError):
+            ed_df['total_quantity'] / pd_df['taxful_total_price']
+
+    def test_ecommerce_series_div(self):
+        pd_df = self.pd_ecommerce()
+        ed_df = self.ed_ecommerce()
+
+        pd_avg_price = pd_df['total_quantity'] / pd_df['taxful_total_price']
+        print(pd_avg_price) # this has None as name
+
+        ed_avg_price = ed_df['total_quantity'] / ed_df['taxful_total_price']
+        print(ed_avg_price)
+
+        assert_pandas_eland_series_equal(pd_avg_price, ed_avg_price, check_less_precise=True)
+
+    def test_ecommerce_series_div_float(self):
+        pd_df = self.pd_ecommerce()
+        ed_df = self.ed_ecommerce()
+
+        pd_avg_price = pd_df['total_quantity'] / 10.0
+        print(pd_avg_price)
+
+        ed_avg_price = ed_df['total_quantity'] / 10.0
+        print(ed_avg_price)
+
+    def test_ecommerce_series_div_other(self):
+        ed_df = self.ed_ecommerce()
+
+        ed_s1 = ed_df.total_quantity
+        ed_s2 = ed_df.taxful_total_price
+
+        print(ed_s1)
+        print(ed_s2)
+
+        print(ed_s1)
+        print(ed_s2)
diff --git a/eland/tests/series/test_rename_pytest.py b/eland/tests/series/test_rename_pytest.py
new file mode 100644
index 0000000..89eb7f7
--- /dev/null
+++ b/eland/tests/series/test_rename_pytest.py
@@ -0,0 +1,23 @@
+# File called _pytest for PyCharm compatability
+import eland as ed
+from eland.tests import ELASTICSEARCH_HOST
+from eland.tests import FLIGHTS_INDEX_NAME
+from eland.tests.common import TestData
+from eland.tests.common import assert_pandas_eland_series_equal
+
+
+class TestSeriesRename(TestData):
+
+    def test_rename(self):
+        pd_carrier = self.pd_flights()['Carrier']
+        ed_carrier = ed.Series(ELASTICSEARCH_HOST, FLIGHTS_INDEX_NAME, 'Carrier')
+
+        assert_pandas_eland_series_equal(pd_carrier, ed_carrier)
+
+        pd_renamed = pd_carrier.rename("renamed")
+        ed_renamed = ed_carrier.rename("renamed")
+
+        assert_pandas_eland_series_equal(pd_renamed, ed_renamed)
+
+
+