ueshin commented on code in PR #49946:
URL: https://github.com/apache/spark/pull/49946#discussion_r1956676096


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bin/pyspark:
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@@ -83,6 +83,8 @@ export 
PYTHONPATH="${SPARK_HOME}/python/lib/py4j-0.10.9.9-src.zip:$PYTHONPATH"
 export OLD_PYTHONSTARTUP="$PYTHONSTARTUP"
 export PYTHONSTARTUP="${SPARK_HOME}/python/pyspark/shell.py"
 
+export PYSPARK_DEFAULT_API_MODE=$($PYSPARK_DRIVER_PYTHON -c "from pyspark.util 
import default_api_mode; print(default_api_mode())")

Review Comment:
   > if the module does not exist, this export will ignore the error and leave 
the variable unset?
   
   If the module does not exist, it will contain an error message from the 
Python command.
   I'll add error check for the value, and show an error message and unset 
`SPARK_CONNECT_MODE`.
   



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