@shyamspr,Thanks for looking but as said both scenarios like we need to add the column data type explicitly with in notebook, consider 30 to 40+ columns .Its not reusable each notebook need to add the schema .

As you updated say like the custom schema structure, am storing that in one file custom_schema.txt .was trying to apply that schema from that file custom_schema.txt ,where we have the Struct type and fields defined, during data read from the file path and dataframe creation

but not able to make it. So was thinking if any python function or any utility can do help to form the reusable code like read the schema definition from file and during data frame we can use same.