[GitHub] HyukjinKwon opened a new pull request #23904: [SPARK-27000][PYTHON] Upgrades cloudpickle to v0.8.0

[GitBox <gi...@apache.org>]

HyukjinKwon opened a new pull request #23904: [SPARK-27000][PYTHON] Upgrades cloudpickle to v0.8.0
URL: https://github.com/apache/spark/pull/23904
 
 
   ## What changes were proposed in this pull request?
   
   After upgrading cloudpickle to 0.6.1 at https://github.com/apache/spark/pull/20691, one regression was found. Cloudpickle had a critical https://github.com/cloudpipe/cloudpickle/pull/240 for that.
   
   Basically, it currently looks existing globals would override globals shipped in a function's, meaning:
   
   **Before:**
   
   ```python
   >>> def hey():
   ...     return "Hi"
   ...
   >>> spark.range(1).rdd.map(lambda _: hey()).collect()
   ['Hi']
   >>> def hey():
   ...     return "Yeah"
   ...
   >>> spark.range(1).rdd.map(lambda _: hey()).collect()
   ['Hi']
   ```
   
   **After:**
   
   ```python
   >>> def hey():
   ...     return "Hi"
   ...
   >>> spark.range(1).rdd.map(lambda _: hey()).collect()
   ['Hi']
   >>>
   >>> def hey():
   ...     return "Yeah"
   ...
   >>> spark.range(1).rdd.map(lambda _: hey()).collect()
   ['Yeah']
   ```
   
   ## How was this patch tested?
   
   Manually tested, tests were added. Verified unit tests were added in cloudpickle.
   

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