Flink: Fix the avro reader issue when reading v2 position deletes.#3540
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The changes look safe to me. I'm assuming that the changes to FileHelpers extend existing tests to use Parquet, Avro, and ORC delete files.
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This is trying to fix the flink's v2 avro reader bug #3477 (comment)
The problem is that the Flink Avro readers do not implement
SupportsRowPositionso the position is always null.