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-461240336 > Why do we need to store a table level mapping when the table's [Iceberg] schema may already have field ids mapped to names? Iceberg names are not necessarily the names used by the writer. Avro coming from Kafka, for example, allows renaming a column. You can still read older data because Avro contains an Alias for it. If we only used Iceberg's current name for a column, a change like this would cause Iceberg to start ignoring records.
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