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[SPARK-19459] Support for nested char/varchar fields in ORC
## What changes were proposed in this pull request? This PR is a small follow-up on https://github.com/apache/spark/pull/16804. This PR also adds support for nested char/varchar fields in orc. ## How was this patch tested? I have added a regression test to the OrcSourceSuite. Author: Herman van Hovell <hvanhovell@databricks.com> Closes #17030 from hvanhovell/SPARK-19459-follow-up.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala 19 additions, 15 deletions...ala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/types/HiveStringType.scala 73 additions, 0 deletions...ain/scala/org/apache/spark/sql/types/HiveStringType.scala
- sql/hive/src/test/scala/org/apache/spark/sql/hive/orc/OrcSourceSuite.scala 8 additions, 4 deletions.../scala/org/apache/spark/sql/hive/orc/OrcSourceSuite.scala
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