[jira] [Created] (LENS-467) Adding using POJOs as another communication protocol between Lens and Drivers

["Himanshu Gahlaut (JIRA)" <ji...@apache.org>]

Himanshu Gahlaut created LENS-467:
-------------------------------------

             Summary: Adding using POJOs as another communication protocol between Lens and Drivers
                 Key: LENS-467
                 URL: https://issues.apache.org/jira/browse/LENS-467
             Project: Apache Lens
          Issue Type: New Feature
            Reporter: Himanshu Gahlaut


In the developer meet dated March 28, 2015, scope of addition of new drivers like elastic search was discussed. Drivers like elastic search driver may retrieve data using programmatic APIs instead of HQL from underlying storage systems. In such cases it will be an overhead on driver side to translate HQL to inputs to be given to programmatic APIs. These drivers may not have join scope as well. This jira is to discuss the scope of communicating an object with following information to drivers:

(a) List of Select
(b) From
(c) List of Where (filters)
(d) List of Group By
(e) List of Having
(f)  List of Joins (Optional)

Lens has already parsed cube query and is aware of above mentioned lists. If lens can communicate these lists to drivers instead of HQL, it will save drivers from parsing HQL.

There may be various things which we have to consider to achieve the same. This jira is to discuss the same.

Drivers may communicate via driver configuration file whether they are interested in HQL or a POJOs composed of above lists and lens may call corresponding APIs on drivers.





--
This message was sent by Atlassian JIRA
(v6.3.4#6332)