Handling bigquery dialect when previewing data (#5655)
Handling bigquery dialect when previewing data (#5655)

* Handling bigquery dialect when previewing data

* review comments

* lint

airbnb/superset,mistercrunch/panoramix,airbnb/superset,airbnb/caravel,airbnb/superset,zhouyao1994/incubator-superset,mistercrunch/panoramix,apache/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,mistercrunch/panoramix,mistercrunch/panoramix,airbnb/superset,apache/incubator-superset,apache/incubator-superset,airbnb/caravel,airbnb/caravel,zhouyao1994/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset