alamb commented on a change in pull request #1054:
URL: https://github.com/apache/arrow-rs/pull/1054#discussion_r773196971
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File path: parquet/src/column/reader.rs
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@@ -102,36 +101,60 @@ pub fn get_typed_column_reader<T: DataType>(
}
/// Typed value reader for a particular primitive column.
-pub struct ColumnReaderImpl<T: DataType> {
+pub type ColumnReaderImpl<T> = GenericColumnReader<
+ decoder::ColumnLevelDecoderImpl,
+ decoder::ColumnLevelDecoderImpl,
+ decoder::ColumnValueDecoderImpl<T>,
+>;
+
+#[doc(hidden)]
+pub struct GenericColumnReader<R, D, V> {
Review comment:
It would help me to document somewhere what `R`, `D` and `V` are
intended for (to make reading this code easier)
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