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-541222642 > if we maintain the invariant that the read schema is always a common subset of the table schema and table mapping, then we can side step this problem. That doesn't work because the underlying records won't be large enough or won't use the right positions. The read schema needs to leave space for columns that will be filled with nulls.
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