[FLINK-13353][table-planner] Remove 2 args constructor in REPLACE expression

This closes #9218

flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/expressions/PlannerExpressionConverter.scala

@@ -304,12 +304,8 @@ class PlannerExpressionConverter private extends ApiExpressionVisitor[PlannerExp
             }
 
           case REPLACE =>
-            assert(args.size == 2 || args.size == 3)
-            if (args.size == 2) {
-              new Replace(args.head, args.last)
-            } else {
-              Replace(args.head, args(1), args.last)
-            }
+            assert(args.size == 3)
+            Replace(args.head, args(1), args.last)
 
           case TRIM =>
             assert(args.size == 4)

flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/expressions/stringExpressions.scala

@@ -476,8 +476,6 @@ case class Replace(
     search: PlannerExpression,
     replacement: PlannerExpression) extends PlannerExpression with InputTypeSpec {
 
-  def this(str: PlannerExpression, begin: PlannerExpression) = this(str, begin, CharLength(str))
-
   override private[flink] def children: Seq[PlannerExpression] = str :: search :: replacement :: Nil
 
   override private[flink] def resultType: TypeInformation[_] = STRING_TYPE_INFO

flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/expressions/PlannerExpressionConverter.scala

@@ -285,12 +285,8 @@ class PlannerExpressionConverter private extends ApiExpressionVisitor[PlannerExp
             }
 
           case REPLACE =>
-            assert(args.size == 2 || args.size == 3)
-            if (args.size == 2) {
-              new Replace(args.head, args.last)
-            } else {
-              Replace(args.head, args(1), args.last)
-            }
+            assert(args.size == 3)
+            Replace(args.head, args(1), args.last)
 
           case TRIM =>
             assert(args.size == 4)

flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/expressions/stringExpressions.scala

@@ -569,8 +569,6 @@ case class Replace(
     search: PlannerExpression,
     replacement: PlannerExpression) extends PlannerExpression with InputTypeSpec {
 
-  def this(str: PlannerExpression, begin: PlannerExpression) = this(str, begin, CharLength(str))
-
   override private[flink] def children: Seq[PlannerExpression] = str :: search :: replacement :: Nil
 
   override private[flink] def resultType: TypeInformation[_] = STRING_TYPE_INFO