valkum commented on issue #17445:
URL: https://github.com/apache/datafusion/issues/17445#issuecomment-3259550049

   If you stick to the Utf8 datatype for `market`, the automatic dict encoding 
done by the parquet writer works. So assume some operation is not properly 
merging the dict keys. The weird thing is that this only happens with 10m rows 
not with 1m even if all rows in the sample file have a market set.
   


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