Notebooks in my workspace are not returning _sqldf when a sql query is run. 

If I run this code, it would give an error in second cell that _sqldf is not defined.

First Cell:

%sql

select * from some_table limit 10

Second Cell:

%sql

select * from _sqldf



However, the same code runs fine in other people's notebook in my organization. I suspect it started when I connected my notebook with sql warehouse as my whole notebook was in sql rather than an all purpose compute. Now I cannot run this above code even when I make a new notebook.

Can anybody suggest how to fix this.