rdblue commented on issue #193:
URL: https://github.com/apache/iceberg/issues/193#issuecomment-690752279


   `idToAlias` is not null when the schema was converted from a Parquet schema. 
So you just have to ensure that the schema you're using was converted from the 
schema of the file you're working with.
   
   Try building the gradle bundle through IntelliJ's gradle plugin. That 
usually fixes it for me.


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