Added implace functionality

Author: Michael Erickson

swat/cas/table.py

@@ -5976,13 +5976,18 @@ def rename(self, columns, errors='ignore', inplace=True, **kwargs):
         -------
         :class:`CASTable`
         '''
+        #If we are working in place, our working table is the table itself
+        table = self
+        #If not, we need to make a copy
+        if not inplace:
+            table = copy.deepcopy(self)
 
         #Columns is a dict:
         alterTable = []
         if isinstance(columns, dict):
             #Convert Pandas-style dict to CAS-style list of dicts
             for oldName, newName in columns.items():
-                if oldName in self.columns:
+                if oldName in table.columns:
                     alterTable.append({'name': oldName, 'rename': newName})
                 #If we encounter a key that doesn't exist as column
                 #and we are raising errors, we do that here
@@ -5992,14 +5997,14 @@ def rename(self, columns, errors='ignore', inplace=True, **kwargs):
         #Columns is a function:
         elif callable(columns):
             #Iterate through all table columns and apply function
-            for col in self.columns:
+            for col in table.columns:
                 alterTable.append({'name': col, 'rename': columns(col)})
         else:
             raise TypeError("Columns must be a dict or function")
 
         #Use list of dicts to rename using alterTable action
-        self._retrieve('alterTable', columns=alterTable)
-        return self
+        table._retrieve('alterTable', columns=alterTable)
+        return table
 
     def reset_index(self, level=None, drop=False, inplace=False,
                     col_level=0, col_fill='', **kwargs):