blcksrx commented on issue #8396: pyarrow does not know how to serialize 
objects of type
URL: 
https://github.com/apache/incubator-superset/issues/8396#issuecomment-543972828
 
 
   It doesn't matter! this error happens on this code:
   ```
   data = (
                   pa.default_serialization_context()
                   .serialize(cdf.raw_df)
                   .to_buffer()
                   .to_pybytes()
               )
   ```
   here is the refrenc uri on sql_lab:
   
https://github.com/apache/incubator-superset/blob/master/superset/sql_lab.py#L275
   
   Also, you can test this issue with trying this code:
   ```
   import pandas as pd 
   import pyarrow as pa
   from  pandas.core.arrays.integer import IntegerArray
   
   int_array = pd.array([1, None, 3], dtype=pd.Int32Dtype())
   
pa.default_serialization_context().serialize(int_array).to_buffer().to_pybytes()
   ```
   
   Here is the `arrow` issue tracker Uri, that I reported this bug:
   
https://issues.apache.org/jira/browse/ARROW-6900?page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel&focusedCommentId=16952842#comment-16952842
 

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