Ryszard T. Kaleta issues

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                                            Ryszard T. Kaleta

rdd.filter() does not preserve partitioning?

Hi, thanks for writing the notebooks. In the [introduction](https://jaceklaskowski.gitbooks.io/mastering-apache-spark/spark-rdd-partitions.html) to RDD partitioning you mention that the `filter` operation does not preserve partitioning. But I'm looking at the [source code](https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/rdd/RDD.scala#L387) where...