emkornfield commented on a change in pull request #10537:
URL: https://github.com/apache/arrow/pull/10537#discussion_r652322630
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File path: cpp/src/parquet/file_reader.h
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@@ -56,6 +56,22 @@ class PARQUET_EXPORT RowGroupReader {
// column. Ownership is shared with the RowGroupReader.
std::shared_ptr<ColumnReader> Column(int i);
+ // Construct a ColumnReader, trying to enable exposed encoding.
+ //
+ // The encoding can only be exposed if the column chunk is encoded with the
+ // same encoding. For dictionary encoding, currently we only support column
+ // chunks that are fully dictionary encoded, i.e., all data pages in the
+ // column chunk are dictionary encoded. If a column chunk uses dictionary
+ // encoding but then falls back to plain encoding, the encoding cannot be
Review comment:
```suggestion
// encoding but then falls back to plain encoding, the encoding will not be
```
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