I'm not a dba and understand maybe 28,5 % of what is written in the links below but it sounds interesting to me. Would some of this be interesting for a next-gen progress database? 

  Small intro:
https://community.progress.com/community_groups/openedge_general/f/26/t/10765.aspx


  Some more:

https://functionwhatwhat.com/json-in-postgresql/

http://www.postgresql.org/docs/9.4/static/datatype-json.html

http://www.enterprisedb.com/nosql-for-enterprise
http://dba.stackexchange.com/questions/34892/why-cant-rdbms-cluster-the-way-nosql-does
http://postgres-xc.sourceforge.net/docs/1_1/intro-whatis.html

And maybe for tomorrow  ;-), an example of the troubles of a company with scaling:

https://www.braintreepayments.com/braintrust/scaling-postgresql-at-braintree-four-years-of-evolution  
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Kind regards,

Stefan Houtzager

Houtzager ICT consultancy & development

www.linkedin.com/in/stefanhoutzager