pysaprk踩坑之-Using RDD of dict to inferSchema is deprecated.Use pyspark.sql.Row instead

1. The reason why the figure below cannot work is that the schema cannot be inferred from the dict
(Using RDD of dict to inferSchema is deprecated.Use pyspark.sql.Row instead) This is not an explicit error, it is a problem that I spent a long time finding .

The above picture can work with a string type, it is very essence, I did it
2. But it's not always true, the following picture is fine, haha,

this does not report an error because the function passed into the map returns a tuple