[FIX](decimalv3) fix large int cast to decimalv3 #26159

fix large int cast to decimalv3 , before if we make data more than max int64 cast to decimalv3 will make result overflow and incorrect
such as

mysql> select CAST(12345678901234567890123456789012345678 AS DECIMALV3(38, 0));
+------------------------------------------------------------------+
| CAST(12345678901234567890123456789012345678 AS DECIMALV3(38, 0)) |
+------------------------------------------------------------------+
|                                             -4302749291975740594 |
+------------------------------------------------------------------+

be/src/vec/data_types/data_type_decimal.h

@@ -596,6 +596,13 @@ ToDataType::FieldType convert_to_decimal(const typename FromDataType::FieldType&
                 return convert_decimals<DataTypeDecimal<Decimal128>, ToDataType>(value, 0, scale);
             }
         }
+        if constexpr (std::is_same_v<FromFieldType, Int128>) {
+            return convert_decimals<DataTypeDecimal<Decimal128>, ToDataType>(value, 0, scale);
+        }
+
+        if constexpr (std::is_same_v<FromFieldType, Int256>) {
+            return convert_decimals<DataTypeDecimal<Decimal256>, ToDataType>(value, 0, scale);
+        }
         return convert_decimals<DataTypeDecimal<Decimal64>, ToDataType>(value, 0, scale);
     }
 }

regression-test/data/query_p0/cast/test_cast_decimalv3.out

@@ -0,0 +1,7 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !sql_string --
+12345678901234567890123456789012345678
+
+-- !sql_largeint --
+12345678901234567890123456789012345678
+

regression-test/suites/query_p0/cast/test_cast_decimalv3.groovy

@@ -0,0 +1,27 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+suite('test_cast_with_decimalv3') {
+    sql """ set enable_nereids_planner=false; """
+    sql """ set enable_fold_constant_by_be=true; """
+
+    // string to decimalv3 with max value
+    qt_sql_string """ select CAST("12345678901234567890123456789012345678" AS DECIMALV3(38, 0)); """
+
+    // largeint to decimalv3 with max value
+    qt_sql_largeint """select CAST(12345678901234567890123456789012345678 AS DECIMALV3(38, 0));"""
+}