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[NO ISSUE][FUN] Add aliases for stddev_*(), var_*() functions

- user model changes: yes

- storage format changes: no

- interface changes: no

Details:

- Support aliases for SQL aggregate functions

- Add function aliases: stddev() -> stddev_samp(),

variance() -> var_samp(), variance_samp() -> var_samp(),

variance_pop() -> var_pop()

- stddev_pop() and var_pop() must return 0 if input is a single item

Change-Id: I0fe04164164726cfb4e17f951f0fd6c2a823c162

Reviewed-on: https://asterix-gerrit.ics.uci.edu/3278

Sonar-Qube: Jenkins <jenkins@fulliautomatix.ics.uci.edu>

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

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

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

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

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    ./stddev.1.query.sqlpp
  1. … 33 more files in changeset.