Github user viirya commented on the issue:
https://github.com/apache/spark/pull/15398
Maybe more important is, how Hive performs `like`. For escaping before a
non-special character, loos like it is different to above examples. If you
gives pattern like `\a`, it matches exactly `\a`, not `a`:
https://github.com/apache/hive/blob/ff67cdda1c538dc65087878eeba3e165cf3230f4/ql/src/java/org/apache/hadoop/hive/ql/udf/UDFLike.java#L64
For ending a pattern with the escape character, looks like it allows this
usage too. It simply see the escape character as normal character.
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