asterixdb

- user model changes: yes

- storage format changes: no

- interface changes: no

Details:

- Implement aggregate window functions:

 agg_func() OVER (frame_var AS)? (PARTITION BY ... ORDER BY ... frame_spec)

- Where agg_func is a SQL/SQL++ aggregate function

- Fix percent_rank() to always return 0 for the first tuple

- Fix ntile() to handle NULL argument

- Log query after each rewrite rule in SqlppQueryRewriter

- Implement toString() for ADayTimeDuration, fix it for AYearMonthDuration

- Add seek() method to RunFileReader

Change-Id: If0f71118a04c2dbd3462070673d52e67f076b7e1

Reviewed-on: https://asterix-gerrit.ics.uci.edu/3049

Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Contrib: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>

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