@lingareddy_Alva

Quick update.  I have populated a collection in the Power App with all  column values without the policy or changes to code snippet.  I had to close and re-open the power app for the amended custom connector to take effect. 

Thanks once again for your help.

 test_bigintcolumn1:
 format: number
 description: Integer column from Databricks
 test_bigintcolumn2:
 format: number
 description: Integer column from Databricks