my code is like:
    rdd2 = rdd1.filter(_._2.length > 1)
    rdd2.collect()
  it works well, but if i use a variable /num/ instead of 1:
    var num = 1
    rdd2 = rdd1.filter(_._2.length > num)
    rdd2.collect()
  it fails at rdd2.collect()
  so strange?



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