[Spark SQL] query nested structure data

[wenchen <cl...@outlook.com>]

I am going to dig into this issue:
https://issues.apache.org/jira/browse/SPARK-2096
However, I noticed that there is already a NestedSqlParser in sql/core/test
org.apache.spark.sql.parquet. 
I checked this parser and it could solve the issue I mentioned before. But
why the author of the parser mark it as temporarily? Does this parser break
some spark sql grammar which I haven't noticed?



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