rdblue commented on issue #207: Add external schema mappings for files written 
with name-based schemas #40
URL: https://github.com/apache/incubator-iceberg/pull/207#issuecomment-538485580
 
 
   One more thing: for Parquet, we detect when there are no field IDs in the 
schema and use the fallback ID assignment strategy only in that case. If we do 
initialize the mapping with the projection schema, then we should do that for 
Avro as well. That way, we don't mix the cases where we need to fallback to 
name-based resolution and the case where at least some IDs are correctly 
assigned.

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