GitHub user jmchung opened a pull request: https://github.com/apache/spark/pull/18930
Spark 21677 ## What changes were proposed in this pull request? ``` scala scala> Seq(("""{"Hyukjin": 224, "John": 1225}""")).toDS.selectExpr("json_tuple(value, trim(null))").show() ... java.lang.NullPointerException at ... ``` Currently the `null` field name will throw NullPointException. As a given field name null can't be matched with any field names in json, we just output null as its column value. This PR achieves it by returning a very unlikely column name `__NullFieldName` in evaluation of the field names. ## How was this patch tested? Added unit test. You can merge this pull request into a Git repository by running: $ git pull https://github.com/jmchung/spark SPARK-21677 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/18930.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #18930 ---- commit 596c2804265e457c378cec433ba2b7fe64f4efdd Author: Jen-Ming Chung <jenmingi...@gmail.com> Date: 2017-08-12T08:37:04Z fix null field name and add corresponding test commit 796041f0f84eac70a2528c37e02dbe4163ddf3aa Author: Jen-Ming Chung <jenmingi...@gmail.com> Date: 2017-08-12T08:39:56Z add description commit f07a9f7e73a17ab5447945d8139a40a1ba8372c5 Author: Jen-Ming Chung <jenmingi...@gmail.com> Date: 2017-08-13T01:48:31Z modify the comment about nullFieldName ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org