What is the cause of the Nested StructType error that occurs when converting a pandas dataframe, which contains dictionaries, into a Spark dataframe?

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The cause of the Nested StructType error is that when the pandas dataframe is converted to a Spark dataframe, the dictionary data type is not supported by Spark. Spark requires StructType data type to represent nested data. Since the dictionary in the pandas dataframe is a nested data structure, it needs to be transformed into a StructType data type before it can be converted to a Spark dataframe. If this transformation is not done properly, it can result in the Nested StructType error.