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Constructs like Hive `TRANSFORM` may generate malformed rows (via badly authored external scripts for example). I'm a bit hesitant to have this feature, since it introduces per-tuple cost when caching tables. However, considering caching tables is usually a one-time cost, this is probably worth having. <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/apache/spark/4842) <!-- Reviewable:end --> Author: Cheng Lian <lian@databricks.com> Closes #4842 from liancheng/spark-6082 and squashes the following commits: b05dbff [Cheng Lian] Provides better error message for malformed rows when caching tables |
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