[GitHub] [arrow] phpsxg commented on issue #35441: How to define that a field can be null

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

phpsxg commented on issue #35441:
URL: https://github.com/apache/arrow/issues/35441#issuecomment-1535794081

   > Seems default of nullable is true ( https://arrow.apache.org/docs/python/generated/pyarrow.field.html#pyarrow.field ). What error does it report? And can you provide how to reproduce the error?
   
   ```
   import random
   
   import pandas as pd
   import pyarrow as pa
   import pyarrow.dataset as ds
   
   schema = pa.schema([
       pa.field('id', pa.string(), metadata={b"table_field": b"ID"}),
       pa.field('name', pa.string(), metadata={b"table_field": b"NAME"}),
       pa.field('age', pa.int8(), metadata={b"table_field": b"AGE"})
   
   ])
   data = {
       "id": [i for i in range(3)],
       "name": [None] * 3,
       "age": [random.randint(10, 30) for i in range(3)]
   }
   df = pd.DataFrame(data)
   print(df)
   
   table = pa.Table.from_pandas(df)
   file_path = 'test'
   ds.write_dataset(table, file_path, format='parquet', schema=schema)
   ```


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