waynexia opened a new issue, #3823: URL: https://github.com/apache/arrow-rs/issues/3823
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** <!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] (This section helps Arrow developers understand the context and *why* for this feature, in addition to the *what*) --> Currently we can set the encoding method for the entire writer (using [`set_encoding()`](https://docs.rs/parquet/34.0.0/parquet/file/properties/struct.WriterPropertiesBuilder.html#method.set_encoding)) or for each column (using [`set_column_encoding()`](https://docs.rs/parquet/34.0.0/parquet/file/properties/struct.WriterPropertiesBuilder.html#method.set_column_encoding)). I'd like to propose another way that allows users to set preferred encoding method for each type. E.g., prefer PLAIN for float and DELTA_BINARY_PACKED for int64 etc. **Describe the solution you'd like** <!-- A clear and concise description of what you want to happen. --> Add a new property that describes the preferred mapping. It can be something like ```rust struct TypeEncoding { boolean: Option<Encoding>, int32: Option<Encoding>, // ... } ``` For priority among all those ways, we can let the more concrete setting overwrites the more general one. I.e, column encoding properties > type encoding properties > global encoding. **Describe alternatives you've considered** <!-- A clear and concise description of any alternative solutions or features you've considered. --> **Additional context** <!-- Add any other context or screenshots about the feature request here. --> -- 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]
