szehon-ho commented on issue #2783:
URL: https://github.com/apache/iceberg/issues/2783#issuecomment-873875087
Preliminary analysis: The BaseDataFile class has some pruning logic,
keeping a mapping called 'fromProjectionPos' that maps indexes in a projection
(a subset of its columns) to real indexes in its column list.
Ie, if the projected array has two elements which are fields 1,2, and 10
respectively, this becomes {1, 2, 10}.
This is fine but the Spark generated code in Spark 3 uses the original index
to get all the fields (It's entry point is StructInternalRow:
https://github.com/apache/iceberg/blob/master/spark/src/main/java/org/apache/iceberg/spark/source/StructInternalRow.java#L124.
(here struct is the BaseDataFile). It calls getInt(0) but due to the mapping
we return value at index 1 which is actually a string and hence the error.
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