alamb commented on issue #9237:
URL: 
https://github.com/apache/arrow-datafusion/issues/9237#issuecomment-1951850821

   @devinjdangelo  implemented the code in 
https://github.com/apache/arrow-datafusion/pull/9240
   
   In order to close this ticket we just need to add test coverage for writing 
partitioned parquet in `DataFrame::write_parquet`
   
   My suggestion is:
   1. Move the existing tests 
https://github.com/apache/arrow-datafusion/blob/4d389c2590370d85bfe3af77f5243d5b40f5a222/datafusion/core/src/datasource/physical_plan/parquet/mod.rs#L2070
 tests into the dataframe tests 
https://github.com/apache/arrow-datafusion/blob/main/datafusion/core/tests/dataframe/mod.rs
   2. Add a new test in 
https://github.com/apache/arrow-datafusion/blob/main/datafusion/core/tests/dataframe/mod.rs
 following the same model, to verify the parquet files were written:
   
   The new test could basically do the same thing as the tests added in
   
https://github.com/apache/arrow-datafusion/pull/9240/files#diff-b7d6c89870d082cac4ecc6de05f2ec393559327472fc4a846986f02c812f661fR34
   
   1. write to a partitioned table 
   2. read back from the table to ensure all data went there
   3. Read back from one of the partitions to ensure the data was actually 
partitioned
   
   
   


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