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## What changes were proposed in this pull request? This PR proposes to add an alias 'names' of 'fieldNames' in Scala. Please see the discussion in [SPARK-20090](https://issues.apache.org/jira/browse/SPARK-20090). ## How was this patch tested? Unit tests added in `DataTypeSuite.scala`. Author: hyukjinkwon <gurwls223@gmail.com> Closes #20545 from HyukjinKwon/SPARK-23359. |
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