[Fix](Nereids) fix fold const be return type (#41164)

remove windowframe in window expression to avoid folding constant on be

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/WindowExpression.java

@@ -66,7 +66,6 @@ public WindowExpression(Expression function, List<Expression> partitionKeys, Lis
                 .add(function)
                 .addAll(partitionKeys)
                 .addAll(orderKeys)
-                .add(windowFrame)
                 .build());
         this.function = function;
         this.partitionKeys = ImmutableList.copyOf(partitionKeys);
@@ -153,6 +152,9 @@ public WindowExpression withChildren(List<Expression> children) {
         if (index < children.size()) {
             return new WindowExpression(func, partitionKeys, orderKeys, (WindowFrame) children.get(index));
         }
+        if (windowFrame.isPresent()) {
+            return new WindowExpression(func, partitionKeys, orderKeys, windowFrame.get());
+        }
         return new WindowExpression(func, partitionKeys, orderKeys);
     }
 

regression-test/suites/nereids_p0/expression/fold_constant/fold_constant_by_be.groovy

@@ -58,4 +58,29 @@ suite("fold_constant_by_be") {
         sql("verbose select substring('123456', 1, 3)")
         contains "varchar(3)"
     }
+
+    sql "drop table if exists table_200_undef_partitions2_keys3_properties4_distributed_by53"
+    sql """create table table_200_undef_partitions2_keys3_properties4_distributed_by53 (
+                    pk int,
+                    col_char_255__undef_signed char(255)  null  ,
+                    col_char_100__undef_signed char(100)  null  ,
+                    col_char_255__undef_signed_not_null char(255)  not null  ,
+                    col_char_100__undef_signed_not_null char(100)  not null  ,
+                    col_varchar_255__undef_signed varchar(255)  null  ,
+                    col_varchar_255__undef_signed_not_null varchar(255)  not null  ,
+                    col_varchar_1000__undef_signed varchar(1000)  null  ,
+                    col_varchar_1000__undef_signed_not_null varchar(1000)  not null  ,
+                    col_varchar_1001__undef_signed varchar(1001)  null  ,
+                    col_varchar_1001__undef_signed_not_null varchar(1001)  not null  
+                    ) engine=olap
+                    DUPLICATE KEY(pk, col_char_255__undef_signed, col_char_100__undef_signed)
+                    distributed by hash(pk) buckets 10
+                    properties("replication_num" = "1");"""
+    explain {
+        sql("select LAST_VALUE(col_char_255__undef_signed_not_null, false) over (partition by " +
+                "concat('GkIPbzAZSu', col_char_100__undef_signed), mask('JrqFkEDqeA') " +
+                "order by pk rows between unbounded preceding and 6 following) AS col_alias26947 " +
+                "from table_200_undef_partitions2_keys3_properties4_distributed_by53;")
+        notContains("mask")
+    }
 }