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Checkpoint directory has not been set in the SparkContext
org.apache.spark.SparkException: Checkpoint directory has not been set in the SparkContext at org.apache.spark.rdd.RDD.checkpoint(RDD.scala:1495) at pl.appsilon.marek.sparkdatalog.eval.DatabaseRepr$$anonfun$checkpoint$1.apply(DatabaseRepr.scala:13) at pl.appsilon.marek.sparkdatalog.eval.DatabaseRepr$$anonfun$checkpoint$1.apply(DatabaseRepr.scala:13) at scala.collection.MapLike$FilteredKeys$$anonfun$foreach$1.apply(MapLike.scala:231) at scala.collection.MapLike$FilteredKeys$$anonfun$foreach$1.apply(MapLike.scala:231) at scala.collection.immutable.Map$Map2.foreach(Map.scala:137) at scala.collection.MapLike$FilteredKeys.foreach(MapLike.scala:231)