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Fix ```subset``` function error when only set ```select``` argument. Please refer to the [JIRA](https://issues.apache.org/jira/browse/SPARK-12234) about the error and how to reproduce it. cc sun-rui felixcheung shivaram Author: Yanbo Liang <ybliang8@gmail.com> Closes #10217 from yanboliang/spark-12234. |
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