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* implement shell for greatest sql aggregator with hardcoded long values * implement functional long greatest aggregator for direct access columns * implement greatest & least sql aggregators for long & double types using abstract base class * add javadocs, unit tests & handling for floats for greatest/least postaggregations * minor checkstyle fix * improve naming for the test cases * make inner class static * remove blank lines to retest travis build * change trivial text to rerun travis build * implement suggested updates for greatest/least sql aggs & fix checkstyle issues * fix stale comments in greatest/least sql aggs abstract base * Update sql.md * improve sql function definitions for greatest/least sql aggs * add more tests for greatest/least sql aggs * add tests to cover invalid greatest/least sql expressions * rename & reorder greatest least sql tests