[GitHub] [iceberg-rust] JanKaul commented on issue #22: Terms, Types and Expressions

["JanKaul (via GitHub)" <gi...@apache.org>]

JanKaul commented on issue #22:
URL: https://github.com/apache/iceberg-rust/issues/22#issuecomment-1671560621

   Implementing expressions feels like a huge task which also has to be maintained later on. I'm not sure about Databend or RisingWave but for Datafusion it would be sufficient to have functionality like:
   
   ```rust
   // returns min value of every manifest file for the given column
   fn manifest_min_values(table: &Table, column_name: &str) -> Vec<Value>
   fn manifest_max_values(table: &Table, column_name: &str) -> Vec<Value>
   
   // returns min value of every data file for the given column
   fn datafile_min_values(table: &Table, column_name: &str) -> Vec<Value>
   fn datafile_max_values(table: &Table, column_name: &str) -> Vec<Value>
   ```
   
   or even better with arrow:
   
   ```rust
   fn manifest_min_values(table: &Table, column_name: &str) -> ArrayRef
   fn manifest_max_values(table: &Table, column_name: &str) -> ArrayRef
   
   fn datafile_min_values(table: &Table, column_name: &str) -> ArrayRef
   fn datafile_max_values(table: &Table, column_name: &str) -> ArrayRef
   ```


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