- new way to specify parameters for predictors. Now, instead of `USING {JSON}` prefer way will be: `USING key=value, another_key.subkey={JSON}, etc`
- beta feature: views.
Create view:
`create view view_name from datasource_name (select * from table);`
List views:
`show views;`
Create predictor from view:
`create predictor predictor_name from views (select * from vies_name) predict column_name
`
- beta feature: now possible train predictors from files:
`create predictor predictor_name from files (select * from file_name) predict column_name`
- returning correct error codes for sql exceptions (previously we always returned 'syntax error' code on any error)
- fix: TS predictions for multiple groups now return correct result