Commits on Sep 7, 2016

1. sql: Add initial support for window functions …

   This change adds support for a subset of all window function
   functionality. Window functions can be run over either pre-existing
   aggregate builtins or a set of window function-only builtins. The change
   only supports running window functions over aggregation functions for now.
   It fully supports the PARTITION BY and ORDER BY clauses, but does not
   yet support frame clause for window definitions.
   
   Future related work:
   - Support window frame clause
   - Add built-in window functions
   - Improve partitioning/sorting/aggregating efficiency (see referenced
     papers in TODOs)
   - Improve inter- and intra-partition parallelism
   - Avoid adding unnecessary extra renders to selectNode
   - Support WITHIN GROUP and FILTER clauses

   

   nvanbenschoten committed Sep 7, 2016
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