aokolnychyi commented on pull request #1665:
URL: https://github.com/apache/iceberg/pull/1665#issuecomment-716780997


   This PR touches a lot of places (i.e. each query engine integration) since 
it relies on the mechanism to propagate table props to the Parquet reader 
builder. We have something similar for our write options.
   
   We have to be careful with serialization since table properties can be Guava 
`ImmutableList` that will cause troubles for custom serialization mechanisms 
that query engines may use (e.g. Kryo). If I remember correctly, Spark still 
uses Java serialization for its tasks but I am not sure about other query 
engines. That being said, we already propagate write properties so the issue 
(if any) is already there.


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