valkum commented on issue #8404:
URL: https://github.com/apache/arrow-rs/issues/8404#issuecomment-3378439532

   I had a bit of time to spend on this again and figured out that this was 
actually a regression introduced by 55.2.0. Bisecting showed that 
e814b97415d2df78c273302dab934dfe2a0a4a64 regressed. 
   Both the market and the type leaf columns report 0 records and values in the 
`GenericRecordReader`. 
   I see two calls to `ByteArrayDictionaryReader::consume_batch` for each 
column (etld, type, market); in the second call the values are already taken by 
`GenericRecordReader::consume_record_data`
   One note: It looks like Polars created a shared `LargeStringArray` Dict for 
all cols (etld, type, market).
   
   


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