rdblue commented on issue #40: Add external schema mappings for files written 
with name-based schemas
URL: 
https://github.com/apache/incubator-iceberg/issues/40#issuecomment-461211206
 
 
   This is for mapping external schemas into Iceberg. Basically adding 
Iceberg's IDs during conversion. This could be done for any format. There's 
code for "fallback" in Parquet that does this using the column ordinal, which 
is how we read old Parquet data.
   
   This particular issue is to add a mapping for Avro, which uses names to 
resolve columns. This is useful for data coming from an external writer that 
can write Avro schemas, but doesn't have an Iceberg schema.

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