[GitHub] [arrow-rs] tustvold commented on issue #4397: arrow::compute::filter_record_batch drops timezone

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

tustvold commented on issue #4397:
URL: https://github.com/apache/arrow-rs/issues/4397#issuecomment-1586981286

   I think this is actually a bug in StructBuilder
   
   ```
   #[test]
   fn filter_record_batch_maintains_timezones() {
       let fields = vec![Field::new(
           "timestamp",
           DataType::Timestamp(TimeUnit::Nanosecond, Some("UTC".to_owned().into())),
           false,
       )];
   
       let field_builders: Vec<Box<dyn ArrayBuilder>> =
           vec![Box::new(TimestampNanosecondBuilder::new())];
   
       let mut sa = StructBuilder::new(fields, field_builders);
   
       for i in 0..100 {
           sa.field_builder::<TimestampNanosecondBuilder>(0)
               .unwrap()
               .append_value(i);
           sa.append(true);
       }
   
       let struct_array = sa.finish();
       assert_eq!(
           struct_array.fields()[0].data_type(),
           &DataType::Timestamp(TimeUnit::Nanosecond, Some("UTC".to_owned().into())),
       );
       // FAILS
       assert_eq!(
           struct_array.column(0).data_type(),
           &DataType::Timestamp(TimeUnit::Nanosecond, Some("UTC".to_owned().into()))
       );
   }
   ```


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