[NSE-1079] Set the default escape char for like function (#1080)

* Set the default escape char for like expression

* Add a test case

native-sql-engine/core/src/main/scala/com/intel/oap/expression/ColumnarBinaryOperator.scala

@@ -138,14 +138,16 @@ class ColumnarLike(left: Expression, right: Expression, original: Expression)
   }
 
   override def doColumnarCodeGen(args: java.lang.Object): (TreeNode, ArrowType) = {
-    val (left_node, left_type): (TreeNode, ArrowType) =
+    val (left_node, _): (TreeNode, ArrowType) =
       left.asInstanceOf[ColumnarExpression].doColumnarCodeGen(args)
-    val (right_node, right_type): (TreeNode, ArrowType) =
+    val (right_node, _): (TreeNode, ArrowType) =
       right.asInstanceOf[ColumnarExpression].doColumnarCodeGen(args)
+    // Currently, we only support "\" as the escape char, which is the default in spark.
+    val escapeNode = TreeBuilder.makeStringLiteral("\\")
 
     val resultType = new ArrowType.Bool()
-    val funcNode =
-      TreeBuilder.makeFunction("like", Lists.newArrayList(left_node, right_node), resultType)
+    val funcNode = TreeBuilder.makeFunction("like",
+      Lists.newArrayList(left_node, right_node, escapeNode), resultType)
     (funcNode, resultType)
   }
 }

native-sql-engine/core/src/test/scala/org/apache/spark/sql/nativesql/NativeSQLConvertedSuite.scala

@@ -65,13 +65,19 @@ class NativeSQLConvertedSuite extends QueryTest
   }
 
   test("like") {
-    Seq(("google", "%oo%"),
-       ("facebook", "%oo%"),
-       ("linkedin", "%in"))
-      .toDF("company", "pat")
+    Seq(("google"),
+       ("facebook"),
+       ("linkedin"))
+      .toDF("company")
       .createOrReplaceTempView("like_all_table")
-    val df = sql("SELECT company FROM like_all_table WHERE company LIKE ALL ('%oo%', pat)")
+    var df = sql("SELECT company FROM like_all_table WHERE company LIKE '%oo%'")
     checkAnswer(df, Seq(Row("google"), Row("facebook")))
+
+    Seq(("http%3A%2F%2Fa%2Eb%2Ec%2Fd%2Fe"))
+      .toDF("url")
+      .createOrReplaceTempView("url_table")
+    df = sql("SELECT url LIKE '%a\\%2Eb\\%2Ec%' FROM url_table")
+    checkAnswer(df, Seq(Row(true)))
   }
 
   ignore("in-joins") {