singleStringOfDelimitedNames= '|'.join([str(x.asDict().values()[0])  for x in
df3.collect()])

df2 = sqlContext.sql("""SELECT field1, field2
                     FROM
                     refinedTable
                     WHERE
                     createdHiveUDF({0}, {1}, cast(field1 as string), cast(field2 as string))
                     """.format(percentage, singleStringOfDelimitedNames))

df2 = sqlContext.sql("""SELECT field1, field2
                     FROM
                     refinedTable
                     WHERE
                     createdHiveUDF({0}, 'Dan|Susie Ann|Bob', cast(field1 as string), cast(field2 as string))
                     """.format(percentage))