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java.lang.NullPointerException: 	at com.google.common.collect.Iterables$3.transform(Iterables.java:508)	at com.google.common.collect.Iterables$3.transform(Iterables.java:505)	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)	at com.google.common.collect.Iterators$5.hasNext(Iterators.java:543)	at com.google.common.collect.Iterators.addAll(Iterators.java:356)	at com.google.common.collect.Sets.newHashSet(Sets.java:238)	at com.google.common.collect.Sets.newHashSet(Sets.java:218)	at io.druid.segment.incremental.SpatialDimensionRowTransformer.(SpatialDimensionRowTransformer.java:63)	at io.druid.segment.incremental.IncrementalIndex.(IncrementalIndex.java:435)	at io.druid.segment.incremental.OnheapIncrementalIndex.(OnheapIncrementalIndex.java:67)	at io.druid.segment.incremental.OnheapIncrementalIndex.(OnheapIncrementalIndex.java:124)	at io.druid.indexer.IndexGeneratorJob.makeIncrementalIndex(IndexGeneratorJob.java:233)	at io.druid.indexer.IndexGeneratorJob.access$000(IndexGeneratorJob.java:93)	at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(IndexGeneratorJob.java:551)	at io.druid.indexer.IndexGeneratorJob$IndexGeneratorReducer.reduce(IndexGeneratorJob.java:469)	at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:171)	at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:627)	at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:389)	at org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:319)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:744)