Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/23028#discussion_r233315067
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala
---
@@ -504,6 +504,19 @@ object LikeSimplification extends Rule[LogicalPlan] {
Like(input, Literal.create(pattern, StringType))
}
}
+
+ case Like(Literal(pattern, StringType), input) =>
--- End diff --
Left input to `Like` is string input. This makes confusing. Right
parameter is `pattern`.
```scala
case Like(Literal(input, StringType), pattern) =>
```
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