szehon-ho edited a comment on issue #2783:
URL: https://github.com/apache/iceberg/issues/2783#issuecomment-873875087
Preliminary analysis: The BaseFile class uses 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 three elements which are fields 1,2, and 10
of the original schema respectively, fromProjectionPos becomes {1, 2, 10}.
This is usually 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 with the pruning mapping, but 'type' is the
original Type).
It calls getInt(0) expecting an int as per the real column at index 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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