[GitHub] [arrow] markhildreth commented on issue #6972: ARROW-8287: [Rust] Add "pretty" util to help with printing tabular output of RecordBatches

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markhildreth commented on issue #6972:
URL: https://github.com/apache/arrow/pull/6972#issuecomment-618501806


   @andygrove Thanks for the feedback. I have updated the PR with a less leaky API. I also fixed the type inference problem that was caused by the new dependency.
   
   @nevi-me True for a singular batch, but it's possible to create multiple batches from different sources. For example
   
   ```
   let schema1 = ...
   let csv1 = ...
   let batch1 = ...
   
   let schema2 = ... // different schema
   let csv2 = ...
   let batch2 = ...
   
   print_batches(&[batch1, batch2]);
   ```
   
   As I said, this is probably not something to worry about too much right now, but I'll probably add an issue for it for later if that's alright. Interestingly, this code wouldn't even necessarily crash; you would just get an odd-looking table:
   
   ```
   +---------------------------------------+-----------+-----------+-------+
   | city                                  | lat       | lng       |       |
   +---------------------------------------+-----------+-----------+-------+
   | Elgin, Scotland, the UK               | 57.653484 | -3.335724 |       |
   | Stoke-on-Trent, Staffordshire, the UK | 53.002666 | -2.179404 |       |
   | Solihull, Birmingham, UK              | 52.412811 | -1.778197 |       |
   | Cardiff, Cardiff county, UK           | 51.481583 | -3.17909  |       |
   | 1                                     | 1.1       | 1.11      | true  |
   | 2                                     | 2.2       | 2.22      | true  |
   | 3                                     | 0         | 3.33      | true  |
   | 4                                     | 4.4       |           | false |
   | 5                                     | 6.6       |           | false |
   +---------------------------------------+-----------+-----------+-------+
   
   ```


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