Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12312#discussion_r59317529
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -529,6 +530,9 @@ object LikeSimplification extends Rule[LogicalPlan] {
StartsWith(l, Literal(pattern))
case endsWith(pattern) =>
EndsWith(l, Literal(pattern))
+ case startsAndEndsWith(prefix, postfix) if !prefix.endsWith("\\")
=>
--- End diff --
i think you should have some comments explaining this rewrite, in
particular the greaterthanorequal part is not as straightforward as the other
ones.
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