maropu commented on a change in pull request #25001: [SPARK-28083][SQL] Support 
LIKE ... ESCAPE syntax
URL: https://github.com/apache/spark/pull/25001#discussion_r305180881
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
 ##########
 @@ -1240,7 +1240,14 @@ class AstBuilder(conf: SQLConf) extends 
SqlBaseBaseVisitor[AnyRef] with Logging
       case SqlBaseParser.IN =>
         invertIfNotDefined(In(e, ctx.expression.asScala.map(expression)))
       case SqlBaseParser.LIKE =>
-        invertIfNotDefined(Like(e, expression(ctx.pattern)))
+        val escapeOpt = Option(ctx.escapeChar).map(string).map { str =>
+          if (str.length > 1) {
+            throw new ParseException("Invalid escape string." +
+              "Escape string must be empty or one character.", ctx)
 
 Review comment:
   Any test for this exception?

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