mistercrunch commented on issue #3243: Nested columns not visible when 
connecting to prestoDB
   Yes we use pyhive. We're committed to allow to go around the lowest common 
denominator issue with SQLAlchemy. We typically put the specifics in the 
`superset.db_engine_specs` module. For instance we could add a custom 
`get_table_columns` method in there that would default to the current 
SQLAlchemy logic in BaseEngineSpecs, but that would implement a solution that 
involves `SHOW COLUMNS FROM table` in the case of Presto.
   It may not make the top of Airbnb's priority list for a little while, but 
we'll happily review a PR that adds functionality in that direction.
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