ggershinsky commented on pull request #950:
URL: https://github.com/apache/parquet-mr/pull/950#issuecomment-1074835875


   Thanks @huaxingao , one more question / clarification. In the writer,
   >  field_id has to be unique in the entire schema, otherwise, an Exception 
will be thrown.
   
   what happens if the column ids are not set by the caller?
   
   In the reader,
   > the id in the requested schema will be used to figured out the original 
ColumnPath.
   
   what happens if the file footer doesn't have the column ids (field_id were 
not set by the writer)?


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