Github user janewangfb commented on the issue:
https://github.com/apache/spark/pull/18023
@cloud-fan, there are difference between `xyz` and xyz. we always need to
extract xyz part from `xyz`, so we will need to pattern match. if we do not get
pattern matched, we know it is not regex, then why bother to use UnsolvedRegex,
which will need to project list expansion later.
Hive supper regex column specification, see
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select.
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