junlincc commented on issue #14726:
URL: https://github.com/apache/superset/issues/14726#issuecomment-844700673


   i agree, we currently send out a preview query each time when selecting a 
table... it  can be cumbersome for data warehouse like clickhouse with maaaaany 
columns. please do open a PR. :) thanks for suggesting 
   
   cc @betodealmeida @eschutho 


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