Fix and conform Spark API's show() and UDF register().#552
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Match DataFrame.show() signature with PySpark's. Translate show() arguments to those of DuckDBPyRelation's show(). Add third argument to create_function() call in register(). Assume register() takes Spark API return type argument. Add null_handling argument to match PySpark's behavior.
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Match DataFrame.show() signature with PySpark's.
Translate show() arguments to those of DuckDBPyRelation's show().
Add third argument to create_function() call in register().
Assume register() takes Spark API return type argument.
Add null_handling argument to match PySpark's behavior.