tree 9e452dd356d49856ac6f4cbe258e2f2c9959cfaf
parent 61f9644e9b740b456ed27e214f8979f96133c5f3
author James Fang <jfang003@ucr.edu> 1552437176 -0700
committer Dmitry Lychagin <dmitry.lychagin@couchbase.com> 1552515137 -0700

[ASTERIXDB-2459][FUN] Add skewness and kurtosis aggregate function

- user model changes: yes
- storage format changes: no
- interface changes: no

Details:
1. Add skewness and kurtosis function and test cases
2. Add skewness and kurtosis distinct functions
3. Add documentation for skewness and kurtosis
4. Cleaned up some files related to the stddev and var tests cases
5. Change stddev() to stddev_samp() and var() to var_samp()

Change-Id: Iae0d7fc9d5ab3676b23b27ad62a730598221d8a5
Reviewed-on: https://asterix-gerrit.ics.uci.edu/3037
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: Dmitry Lychagin <dmitry.lychagin@couchbase.com>