Lakshmanan Ramakrishnan
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Lakshmanan Ramakrishnan
I believe the issue is DefaultSource extends HadoopFsRelationProvider and in spark https://github.com/apache/spark/blob/branch-1.6/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/ResolvedDataSource.scala#L112 For all datasources extending from HadoopFsRelationProvider, all columns are nullable. This looks to be a very bad issue...