[ASTERIXDB-2459][FUN] Add sttdev() aggregate function- user model changes: yes- storage format changes: no- interface changes: noDetails:1. Added stddev aggregation function and test cases2. Added stddev to documentation and fixed some typos3. Added serializable aggregate optimizer test4. Change IncompatibleTypeException in aggregates to be deterministiccommit 26edb576f55a3d2308996f054a58ad43ab910f9bAuthor: James Fang <jfang003@ucr.edu>Date: Fri Oct 5 15:10:37 2018 -0700Change-Id: Ia709669a9d20358f11ad28f453ae8ad8551f6334Reviewed-on: https://asterix-gerrit.ics.uci.edu/2990Tested-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>
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