[GitHub] [arrow] wjones127 commented on issue #34546: Datasets with partitions create a list instead of folders

["wjones127 (via GitHub)" <gi...@apache.org>]

wjones127 commented on issue #34546:
URL: https://github.com/apache/arrow/issues/34546#issuecomment-1466458699

   Hi John, have you looked at the values in your `table`? Do any of them contain the value `[\n"partition1"\n]`?
   
   I tried to reproduce this (just locally, not GCS yet), but was not able to (writing the dataset worked fine):
   
   ```python
   import pyarrow as pa
   import pyarrow.dataset as ds
   
   table = pa.table(
       {
           "partition1": ["1", "2", "3", "4", "5"],
           "partition2": ["2001", "2002", "2003", "2004", "2004"],
           "3": ["1", "2", "3", "4", "5"],
           "val": list(range(5)),
       }
   )
   file_options = ds.ParquetFileFormat().make_write_options(compression="zstd")
   partitions = ds.partitioning(
       schema=pa.schema(
           [
               ("partition1", pa.large_string()),
               ("partition2", pa.large_string()),
               ("3", pa.large_string()),
           ]
       )
   )
   ds.write_dataset(
       table,
       f"tables/test_parts",
       format="parquet",
       file_options=file_options,
       partitioning=partitions,
       schema=table.schema,
       existing_data_behavior="overwrite_or_ignore",
   )
   ```


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