[SPARK-33677][SQL] Skip LikeSimplification rule if pattern contains any escapeChar

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/expressions.scala

@@ -543,27 +543,33 @@ object LikeSimplification extends Rule[LogicalPlan] {
   private val equalTo = "([^_%]*)".r
 
   def apply(plan: LogicalPlan): LogicalPlan = plan transformAllExpressions {
-    case Like(input, Literal(pattern, StringType), escapeChar) =>
+    case l @ Like(input, Literal(pattern, StringType), escapeChar) =>
       if (pattern == null) {
         // If pattern is null, return null value directly, since "col like null" == null.
         Literal(null, BooleanType)
       } else {
-        val escapeStr = String.valueOf(escapeChar)
         pattern.toString match {
-          case startsWith(prefix) if !prefix.endsWith(escapeStr) =>
+          // There are three different situations when pattern containing escapeChar:
+          // 1. pattern contains invalid escape sequence, e.g. 'm\aca'
+          // 2. pattern contains escaped wildcard character, e.g. 'ma\%ca'
+          // 3. pattern contains escaped escape character, e.g. 'ma\\ca'
+          // Although there are patterns can be optimized if we handle the escape first, we just
+          // skip this rule if pattern contains any escapeChar for simplicity.
+          case p if p.contains(escapeChar) => l
+          case startsWith(prefix) =>
             StartsWith(input, Literal(prefix))
           case endsWith(postfix) =>
             EndsWith(input, Literal(postfix))
           // '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(escapeStr) =>
+          case startsAndEndsWith(prefix, postfix) =>
             And(GreaterThanOrEqual(Length(input), Literal(prefix.length + postfix.length)),
               And(StartsWith(input, Literal(prefix)), EndsWith(input, Literal(postfix))))
-          case contains(infix) if !infix.endsWith(escapeStr) =>
+          case contains(infix) =>
             Contains(input, Literal(infix))
           case equalTo(str) =>
             EqualTo(input, Literal(str))
-          case _ => Like(input, Literal.create(pattern, StringType), escapeChar)
+          case _ => l
         }
       }
   }

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/LikeSimplificationSuite.scala

@@ -116,4 +116,52 @@ class LikeSimplificationSuite extends PlanTest {
     val optimized2 = Optimize.execute(originalQuery2.analyze)
     comparePlans(optimized2, originalQuery2.analyze)
   }
+
+  test("SPARK-33677: LikeSimplification should be skipped if pattern contains any escapeChar") {
+    val originalQuery1 =
+      testRelation
+        .where(('a like "abc%") || ('a like "\\abc%"))
+    val optimized1 = Optimize.execute(originalQuery1.analyze)
+    val correctAnswer1 = testRelation
+      .where(StartsWith('a, "abc") || ('a like "\\abc%"))
+      .analyze
+    comparePlans(optimized1, correctAnswer1)
+
+    val originalQuery2 =
+      testRelation
+        .where(('a like "%xyz") || ('a like "%xyz\\"))
+    val optimized2 = Optimize.execute(originalQuery2.analyze)
+    val correctAnswer2 = testRelation
+      .where(EndsWith('a, "xyz") || ('a like "%xyz\\"))
+      .analyze
+    comparePlans(optimized2, correctAnswer2)
+
+    val originalQuery3 =
+      testRelation
+        .where(('a like ("@bc%def", '@')) || ('a like "abc%def"))
+    val optimized3 = Optimize.execute(originalQuery3.analyze)
+    val correctAnswer3 = testRelation
+      .where(('a like ("@bc%def", '@')) ||
+        (Length('a) >= 6 && (StartsWith('a, "abc") && EndsWith('a, "def"))))
+      .analyze
+    comparePlans(optimized3, correctAnswer3)
+
+    val originalQuery4 =
+      testRelation
+        .where(('a like "%mn%") || ('a like ("%mn%", '%')))
+    val optimized4 = Optimize.execute(originalQuery4.analyze)
+    val correctAnswer4 = testRelation
+      .where(Contains('a, "mn") || ('a like ("%mn%", '%')))
+      .analyze
+    comparePlans(optimized4, correctAnswer4)
+
+    val originalQuery5 =
+      testRelation
+        .where(('a like "abc") || ('a like ("abbc", 'b')))
+    val optimized5 = Optimize.execute(originalQuery5.analyze)
+    val correctAnswer5 = testRelation
+      .where(('a === "abc") || ('a like ("abbc", 'b')))
+      .analyze
+    comparePlans(optimized5, correctAnswer5)
+  }
 }

sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala

@@ -3718,6 +3718,20 @@ class SQLQuerySuite extends QueryTest with SharedSparkSession with AdaptiveSpark
       }
     }
   }
+
+  test("SPARK-33677: LikeSimplification should be skipped if pattern contains any escapeChar") {
+    withTable("string_tbl") {
+      sql("CREATE TABLE string_tbl USING parquet SELECT 'm@ca' AS s")
+
+      val e = intercept[AnalysisException] {
+        sql("SELECT s LIKE 'm%@ca' ESCAPE '%' FROM string_tbl").collect()
+      }
+      assert(e.message.contains("the pattern 'm%@ca' is invalid, " +
+        "the escape character is not allowed to precede '@'"))
+
+      checkAnswer(sql("SELECT s LIKE 'm@@ca' ESCAPE '@' FROM string_tbl"), Row(true))
+    }
+  }
 }
 
 case class Foo(bar: Option[String])