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Re:Alpaca: Algo Trading Commission Free Arrives on Friday April 27, 2018 @02:34AM (#16938824)
Great job on this - I’m so excited to use it - when does it go fully live?
Re:Pgsql: Support Grouping Sets, Cube, and Rollup on Saturday May 16, 2015 @12:42PM (#9556716)
SSAS and other cube (MOLAP) tools create persistent cubes as materialized views. Databases that do ROLAP processing create "cubes on the fly" which persist for the duration of the query.

If PG adopts a materialized view that supports controlled automatic maintenance, then you'd have something similar to what the MOLAP tools do.

Note that MOLAP is a trap of sorts (no pun intended).