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[SPARK-8868] SqlSerializer2 can go into infinite loop when row consists only of NullType columns
https://issues.apache.org/jira/browse/SPARK-8868 Author: Yin Huai <yhuai@databricks.com> Closes #7262 from yhuai/SPARK-8868 and squashes the following commits: cb58780 [Yin Huai] Andrew's comment. e456857 [Yin Huai] Josh's comments. 5122e65 [Yin Huai] If types of all columns are NullTypes, do not use serializer2.
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- sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlSerializer2.scala 20 additions, 5 deletions.../org/apache/spark/sql/execution/SparkSqlSerializer2.scala
- sql/core/src/test/scala/org/apache/spark/sql/execution/SparkSqlSerializer2Suite.scala 19 additions, 1 deletion...apache/spark/sql/execution/SparkSqlSerializer2Suite.scala
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