Submitted on: 12 January 2013.
Revised on: 11 May 2013.
Accepted on: 19 June 2013.
___________________Foundations and Trends in Databases
Submitted on: 12 September 2017.
Revised on: 24 December 2017.
Accepted on: 18 February 2018.
___________________Foundations and Trends in Databases
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Submitted on: 30 March 2016.
Revised on: 27 May 2016.
Accepted on: 20 June 2016.
___________________Foundations and Trends in Databases
Submitted on: 23 April 2018.
Revised on: 02 July 2018.
Accepted on: 05 August 2018.
___________________Foundations and Trends in Databases
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