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[Vivek Rao]

These docs are really useful if I’m playing around with primitive data types. 
There’s no examples of how to transform the data I get from Snowflake into more 
complicated data types. For instance, if I'm reading an employee table, how do 
I serialize my results into a Person pojo? Ideally I’d like to know how I can 
execute a query and serialize the results into a PCollection<Person>. The only 
hint I have is I would have to write a custom coder for this.