Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/12312#discussion_r59757742
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -529,6 +530,11 @@ object LikeSimplification extends Rule[LogicalPlan] {
StartsWith(l, Literal(pattern))
case endsWith(pattern) =>
EndsWith(l, Literal(pattern))
+ // 'a%a' pattern is basically same with 'a%' && '%a'.
+ // However, the additional `Length` condition is required to
prevent 'a' match 'a%a'.
+ case startsAndEndsWith(prefix, postfix) if !prefix.endsWith("\\")
=>
--- End diff --
while you are at it, can you rename "pattern" in the startsWith case to
prefix, and endsWith to suffix?
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