tustvold commented on a change in pull request #1622:
URL: https://github.com/apache/arrow-datafusion/pull/1622#discussion_r789900481
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File path: datafusion/src/physical_plan/file_format/parquet.rs
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@@ -385,9 +388,33 @@ fn build_row_group_predicate(
}
}
+// Map projections from the schema which merges all file schemas to
projections on a particular
+// file
+fn map_projections(
Review comment:
I wonder if this logic and the logic in read_partition might be
extracted into some of `SchemaAdapter`, akin to `PartitionColumnProjector`.
This would allow the logic to be reused with other file formats, e.g. JSON or
CSV, whilst also allowing testing it in isolation.
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