6/11/2023 0 Comments Expected a dict objectWord_prob_b = (word_prob) Broadcast limitations Word_prob = quinn.two_columns_to_dictionary(df, 'word', 'word_prob') The quinn library makes this even easier. Lets create a state_abbreviation UDF that takes a string and a dictionary mapping as arguments: state_abbreviation(s, mapping):Ĭreate a sample DataFrame, attempt to run the state_abbreviation UDF and confirm that the code errors out because UDFs can’t take dictionary arguments. You can’t pass a dictionary as a UDF argument Several approaches that do not work and the accompanying error messages are also presented, so you can learn more about how Spark works. It’ll also show you how to broadcast a dictionary and why broadcasting is important in a cluster environment. This blog post shows you the nested function work-around that’s necessary for passing a dictionary to a UDF. UDFs only accept arguments that are column objects and dictionaries aren’t column objects. ![]() ![]() ![]() ![]() Passing a dictionary argument to a PySpark UDF is a powerful programming technique that’ll enable you to implement some complicated algorithms that scale.īroadcasting values and writing UDFs can be tricky.
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