Github user jodersky commented on the issue: https://github.com/apache/spark/pull/15398 @hvanhovell, I just wanted to add that option 2 from my last comment won't work: if we replace `\\` with `\\\\` in the unescape function (as is done for `\%` and `\_`), it will be impossible for a user to specify a single backslash. Considering that, another potential solution would be change the ANTLR parser to handle escaping differently in LIKE expressions. This would however introduce a special case which complicates the overall rules. Maybe leaving the current behaviour but documenting that backslashes are escaped on the parser-level is the best option?
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