[fix](nereids) fix rule AvgDistinctToSumDivCount need add cast

fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/AvgDistinctToSumDivCount.java

@@ -57,7 +57,8 @@ public Rule build() {
                                                 ((Avg) function).child()));
                                 Count count = (Count) TypeCoercionUtils.processBoundFunction(
                                         new Count(true, ((Avg) function).child()));
-                                Expression divide = TypeCoercionUtils.processDivide(new Divide(sum, count));
+                                Expression divide = TypeCoercionUtils.castIfNotSameType(TypeCoercionUtils.processDivide(
+                                        new Divide(sum, count)), function.getDataType());
                                 if (!function.nullable() && divide.nullable()) {
                                     // add NonNullable to ensure the result of divide is not nullable,
                                     // otherwise AdjustNullable rule will throw exception

regression-test/data/nereids_rules_p0/avg_distinct_to_sum_div_count/avg_distinct_to_sum_div_count.out

@@ -0,0 +1,4 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !ctas --
+135.55	67.7750
+

regression-test/suites/nereids_rules_p0/avg_distinct_to_sum_div_count/avg_distinct_to_sum_div_count.groovy

@@ -0,0 +1,29 @@
+// 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("avg_distinct_to_sum_div_count") {
+    sql "drop table if exists t1;"
+    sql """ create table t1 (
+            pk int,
+            c1 decimal(12,2)  not null)
+            properties("replication_num" = "1");"""
+
+    sql "insert into t1 values(1,12.32),(2,123.23);"
+    sql "drop table if exists testctas;"
+    sql """create table  testctas properties("replication_num" = "1") select sum(distinct c1),avg(distinct c1) from t1;"""
+    qt_ctas "select * from testctas;"
+}