1、could not open socket when convert spark df to pandas df.
spark.conf.set("spark.sql.execution.arrow.enabled", "true")
参考：https://forums.databricks.com/questions/14903/could-not-open-socket-when-convert-spark-df-to-pan.html
spark.conf.set("spark.sql.execution.arrow.enabled", "true")
参考：https://forums.databricks.com/questions/14903/could-not-open-socket-when-convert-spark-df-to-pan.html
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