pvary commented on issue #3913:
URL: https://github.com/apache/iceberg/issues/3913#issuecomment-1016324141
The problem is that the unnecessary columns has already been read at this
point. We have read 3 columns instead of the required 1, and the created
records already contains all of the 3 columns ('id', 'data', 'dept'), but we
expect only 1 ('dept'). If we use the position we fail, but if we use the
`name` of the column we can still find the column. Which means that the query
is running, but it has read the unnecessary columns.
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