Rich-T-kid commented on PR #21765: URL: https://github.com/apache/datafusion/pull/21765#issuecomment-4676981749
When arrow-rs reads RLE-encoded strings from a Parquet file, it decodes them into dictionary arrays. These flow through operators like any other array. For operators like `AggregateExec`, the dictionary gets expanded during grouping: the `GroupValuesRows` grouping implementation uses `RowConverter`, which expands dictionaries when converting columns to their row representation. ([source](https://github.com/apache/arrow-rs/blob/301eb26bb92362e531bd6c39980292ebcae8e8aa/arrow-row/src/lib.rs#L2060)) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
