Fallback to Spark for LIKE with custom escape character

Currently, LIKE with custom escape character produces incorrect results.

spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala

@@ -981,7 +981,7 @@ object QueryPlanSerde extends Logging with ShimQueryPlanSerde {
             None
           }
 
-        case Like(left, right, _) =>
+        case Like(left, right, escapeChar) if escapeChar == '\\' =>
           // TODO escapeChar
           val leftExpr = exprToProtoInternal(left, inputs)
           val rightExpr = exprToProtoInternal(right, inputs)

spark/src/test/scala/org/apache/comet/CometExpressionSuite.scala

@@ -578,6 +578,20 @@ class CometExpressionSuite extends CometTestBase with AdaptiveSparkPlanHelper {
     }
   }
 
+  test("like with custom escape") {
+    val table = "names"
+    withTable(table) {
+      sql(s"create table $table(id int, name varchar(20)) using parquet")
+      sql(s"insert into $table values(1,'James Smith')")
+      sql(s"insert into $table values(2,'Michael_Rose')")
+      sql(s"insert into $table values(3,'Robert_R_Williams')")
+
+      // Filter column having values that include underscores
+      val query = sql("select id from names where name like '%$_%' escape '$'")
+      checkAnswer(query, Row(2) :: Row(3) :: Nil)
+    }
+  }
+
   test("contains") {
     assume(!isSpark32)