Re: [I] python docs: Add an example for opendal + pandas/polars [opendal]

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

reswqa commented on issue #4270:
URL: https://github.com/apache/opendal/issues/4270#issuecomment-1996603884

   This is my first time in the opendal community 😄 Well, I just saw this issue, and I'm glad you mentioned polars also(I am one of the core dev of polars).
   
   > Seems that we could open a file and then pass the reader to pandas/polars?
   
   I'm not familiar with opendal, but I tried to run the following code:
   ```python
   op = opendal.Operator("fs", root="xxx")
   
   pandas.read_csv(open("xxx/a.csv", mode="rb")) # this works
   polars.read_csv(open("xxx/a.csv", mode="rb")) # this works
   
   with op.open("a.csv", mode ="rb") as file:
       pandas.read_csv(file) # this raise
   
   with op.open("a.csv", mode ="rb") as file:
       polars.read_csv(file) # this raise
   ```
   
   But both of `polars` and `pandas` raise `OSError: failed to fill whole buffer`. IIUC, `op.open("a.csv", mode ="rb")` is a file-like object that we expect to work directly. Feel free to point out if I missed something? Thanks!
   
   


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