alamb opened a new pull request #8303:
URL: https://github.com/apache/arrow/pull/8303


   When I use the `filter` kernel with Null strings, any input column that was 
Null turns into an empty string after filtering.
   
   ```
   "foo"
   "bar"
   NULL
   ```
   And the filter 
   ```
   true
   true
   true
   ```
   
   Will result in 
   ```
   "foo"
   "bar"
   ""
   ```
   
   Rather than
   ```
   "foo"
   "bar"
   NULL
   ```
   
   It appears to work fine for primitive arrays (I'll comment inline).  I also 
added `BinaryArray::from_opt_vec` following the model of `PrimativeArray` and 
`StringArray` mostly so I could write a test. 


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