Add yearly and quarterly granularities to mysql engine backend (#1518)
Add yearly and quarterly granularities to mysql engine backend (#1518)


jeromecn/caravel_viz_full,SingTel-DataCo/incubator-superset,alanmcruickshank/superset-dev,timifasubaa/incubator-superset,airbnb/superset,massgov/incubator-superset,timifasubaa/incubator-superset,zhouyao1994/incubator-superset,ArijanaBrlek/superset,zhouyao1994/incubator-superset,dmigo/incubator-superset,SingTel-DataCo/incubator-superset,mistercrunch/panoramix,airbnb/superset,robert-digit/superset,robert-digit/superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,BRD-CD/superset,nekia/incubator-superset-dev,asdf2014/superset,massgov/incubator-superset,robert-digit/superset,asdf2014/superset,dmigo/incubator-superset,massgov/incubator-superset,alanmcruickshank/superset-dev,alanmcruickshank/superset-dev,FrederichCheng/incubator-superset,jeromecn/caravel_viz_full,airbnb/caravel,jeromecn/caravel_viz_full,dmigo/incubator-superset,FrederichCheng/incubator-superset,mistercrunch/panoramix,apache/incubator-superset,asdf2014/superset,zhouyao1994/incubator-superset,airbnb/caravel,zhouyao1994/incubator-superset,jeromecn/caravel_viz_full,apache/incubator-superset,FrederichCheng/incubator-superset,FrederichCheng/incubator-superset,airbnb/superset,BRD-CD/superset,ArijanaBrlek/superset,robert-digit/superset,mistercrunch/panoramix,apache/incubator-superset,apache/incubator-superset,SingTel-DataCo/incubator-superset,asdf2014/superset,apache/incubator-superset,timifasubaa/incubator-superset,SingTel-DataCo/incubator-superset,dmigo/incubator-superset,airbnb/caravel,nekia/incubator-superset-dev,massgov/incubator-superset,airbnb/caravel,ArijanaBrlek/superset,airbnb/superset,nekia/incubator-superset-dev,ArijanaBrlek/superset,BRD-CD/superset,timifasubaa/incubator-superset,BRD-CD/superset,nekia/incubator-superset-dev,alanmcruickshank/superset-dev