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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