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[PIO-138] Fix batchpredict for custom PersistentModel #447
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Fixes PIO-138
Switches batch query processing from Spark RDD to a Scala parallel collection. As a result, the
pio batchpredict
command changes in the following ways:--query-partitions
option is no longer available; parallelism is now managed by Scala's parallel collections--input
option is now read as a plain, local file--output
option is now written as a plain, local fileThis solves the root problem that certain custom PersistentModels, such as ALS Recommendation template, may themselves contain RDDs, which cannot be nested inside the batch queries RDD. (See SPARK-5063)