Implementing Group By in Apache Superset - apache-superset

Is there any way to implement group by to Apache Superset dashboard ? Superset only provide filter box for searching.
Any feasible Solution to implement group by to dashboards ?

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Elastic search and Lucene for Django and MongoDB

I'm implementing a search engine in my Django project with MongoDB. But I have some confusion about choosing between Lucene and ElasticSearch. As mentioned, I'm using MongoDB for storing data. Anyone, please give me the technical reason for choosing Lucene over ElasticSearch. Which one is better for indexing and analytics as well.

Extracting Sitecore Analytic Data

I'm new to Sitecore concepts, and I'm searching almost five days for an answer. I couldn't find what I'm looking for.
I'm trying to access Sitecore analytic data from a web service. I found a web service of Sitecore with using this document. I want to extract data that are about this. I believe this is a public demo site.
I want to access Web Api, then extract data and use it at my own project. Any idea?
When working with Sitecore 9, the API you want to use to connect to analytics data is known as xConnect. A secure connection is required using trusted certificates, so you cannot connect to an existing instance that somebody else setup like the Habitat demo you linked to.
xConnect is an abstraction API that allows you to collect and search all data in the xDB. The architecture fully supports both vertical and horizontal scaling of xConnect services separate from your Sitecore installations.
Resources
You can read more about xConnect here in the official developer documentation: https://doc.sitecore.net/developers/xp/xconnect/
There is an xConnect tutorial available here: https://doc.sitecore.net/developers/xp/getting-started/#tutorials-xconnect
I also have a small tutorial you can use on GitHub to start learning the concepts: https://github.com/jst-cyr/XConnectTutorial

Can any application create Connectors for itself in Groups?

We would like to use the connectors feature to give users access to information from our line of business system inside groups. This seems possible using the webhooks method mentioned, but how do we get our connector in the list of Connectors our users can access?
That is correct, Incoming WebHooks allow you to build your own connectors.
You would be able to submit custom built Connectors to the 'Connector Store' as soon as connectors are out of developer preview.
Until then, you can facilitate connections to Office365 directly from your LOB applications using the 'Connect to Office 365 button'. This way you can abstract out copy-pasting WebHook URLs from your end users.

Can I use Django's administration interface with a non-sql database?

I'm hoping to use Amazon's dynamoDB with a Django application. I know that the administration interface is relying on a relational DB like MySql or SqlLite. Can I use the administration interface on a non-relational DB such as dynamoDB?
Thanks
Your best bet is http://django-nonrel.org/. But that only supports MongoDB & Google App Engine.
A Django session backend for DynamoDB
https://github.com/gtaylor/django-dynamodb-sessions

Automatically add users to API Manager

I am looking for a way to automatically add users to WSO2 API Manager. I have a basic install with the H2 database, but someday I might move to postgres or something like that. What is the best way to add users from say a script?
In Carbon products (APIM, IS), All user store operations can be exposed via web services. External application can use these web services to add/delete/update/get in to user store users and groups. Please note, H2 is not recommended for products`
REST web service according to the SCIM provisioning specification.
SOAP based Web service. You can find more detail from here