mapleFU commented on code in PR #43661:
URL: https://github.com/apache/arrow/pull/43661#discussion_r1717989511
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cpp/src/arrow/dataset/file_parquet.cc:
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@@ -555,6 +562,57 @@ Future<std::shared_ptr<parquet::arrow::FileReader>>
ParquetFileFormat::GetReader
});
}
+struct CastingGenerator {
Review Comment:
I just check this. We can first add a `CastingGenerator`, because sometimes
we would have schema evolution here, and need cast to a "final type". The
Parquet reader code can be regard as an optimization
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