add basic projection expressions

moto/dynamodb2/responses.py

@@ -276,6 +276,8 @@ class DynamoHandler(BaseResponse):
         name = self.body['TableName']
         # {u'KeyConditionExpression': u'#n0 = :v0', u'ExpressionAttributeValues': {u':v0': {u'S': u'johndoe'}}, u'ExpressionAttributeNames': {u'#n0': u'username'}}
         key_condition_expression = self.body.get('KeyConditionExpression')
+        projection_expression = self.body.get('ProjectionExpression')
+
         filter_kwargs = {}
         if key_condition_expression:
             value_alias_map = self.body['ExpressionAttributeValues']
@@ -383,16 +385,20 @@ class DynamoHandler(BaseResponse):
         scan_index_forward = self.body.get("ScanIndexForward")
         items, scanned_count, last_evaluated_key = dynamodb_backend2.query(
             name, hash_key, range_comparison, range_values, limit,
-            exclusive_start_key, scan_index_forward, index_name=index_name, **filter_kwargs)
+            exclusive_start_key, scan_index_forward, projection_expression, index_name=index_name, **filter_kwargs)
         if items is None:
             er = 'com.amazonaws.dynamodb.v20111205#ResourceNotFoundException'
             return self.error(er, 'Requested resource not found')
 
         result = {
             "Count": len(items),
-            "ConsumedCapacityUnits": 1,
+            'ConsumedCapacity': {
+                'TableName': name,
+                'CapacityUnits': 1,
+            },
             "ScannedCount": scanned_count
         }
+
         if self.body.get('Select', '').upper() != 'COUNT':
             result["Items"] = [item.attrs for item in items]