Github user cloud-fan commented on a diff in the pull request:
    --- Diff: python/pyspark/sql/tests/ ---
    @@ -23,7 +23,7 @@
     from pyspark import SparkContext
     from pyspark.sql import SparkSession, Column, Row
    -from pyspark.sql.functions import UserDefinedFunction
    +from pyspark.sql.functions import UserDefinedFunction, udf
    --- End diff --
    add the import here, as a lof of tests use it


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