[fix](fe) LIST partition table support modify default bucket num

fe/fe-core/src/main/java/org/apache/doris/catalog/Env.java

@@ -4729,7 +4729,7 @@ public void modifyTableColocate(Database db, OlapTable table, String assignedGro
         GroupId groupId = null;
         if (!Strings.isNullOrEmpty(assignedGroup)) {
             String fullAssignedGroupName = GroupId.getFullGroupName(db.getId(), assignedGroup);
-            //When the new name is the same as the old name, we return it to prevent npe
+            // When the new name is the same as the old name, we return it to prevent npe
             if (!Strings.isNullOrEmpty(oldGroup)) {
                 String oldFullGroupName = GroupId.getFullGroupName(db.getId(), oldGroup);
                 if (oldFullGroupName.equals(fullAssignedGroupName)) {
@@ -5346,7 +5346,8 @@ public void modifyDefaultDistributionBucketNum(Database db, OlapTable olapTable,
                 throw new DdlException("Cannot change default bucket number of colocate table.");
             }
 
-            if (olapTable.getPartitionInfo().getType() != PartitionType.RANGE) {
+            if (olapTable.getPartitionInfo().getType() != PartitionType.RANGE
+                    && olapTable.getPartitionInfo().getType() != PartitionType.LIST) {
                 throw new DdlException("Only support change partitioned table's distribution.");
             }
 

regression-test/data/alter_p1/test_alter_modify_bucket.out

@@ -0,0 +1,6 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !select --
+1	1	2024-08-20	21	21:00:00	2024-08-20	1724158800000
+2	2	2024-08-20	22	22:00:00	2024-08-20	1724162400000
+3	3	2024-08-20	23	23:00:00	2024-08-20	1724166000000
+

regression-test/suites/alter_p1/test_alter_modify_bucket.groovy

@@ -0,0 +1,86 @@
+// 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_alter_modify_bucket') {
+    def tbl = 'test_alter_modify_bucket_tbl'
+    sql "DROP TABLE IF EXISTS ${tbl} FORCE"
+    sql """
+        CREATE TABLE ${tbl} (
+            `id1` VARCHAR(255) NULL COMMENT 'id1',
+            `id2` VARCHAR(255) NULL COMMENT 'id2',
+            `dt` VARCHAR(255) NOT NULL COMMENT '日期分区',
+            `hr` VARCHAR(255) NOT NULL COMMENT '小时分区',
+            `event_time` VARCHAR(255) NULL COMMENT '事件时间',
+            `event_date` VARCHAR(255) NULL COMMENT '事件日期',
+            `event_ts` VARCHAR(256) NULL COMMENT '事件发生时间戳(毫秒)'
+        ) ENGINE=OLAP
+        UNIQUE KEY(`id1`,`id2`,`dt`,`hr`)
+        COMMENT 'xxx' 
+        PARTITION BY LIST(`dt`, `hr`) (
+            PARTITION p2024082021 VALUES IN (("2024-08-20", "21"))
+        )
+        DISTRIBUTED BY HASH(`id1`,`id2`) BUCKETS 1
+        PROPERTIES (
+            "replication_allocation" = "tag.location.default: 1"
+        );
+    """
+
+    // check existed partition buckets
+    List<List<Object>> res = sql """
+        SHOW PARTITIONS FROM ${tbl}
+    """
+    assertEquals(res[0][8],"1")
+
+    // add new partition and insert values
+    sql """
+        ALTER TABLE ${tbl} ADD PARTITION IF NOT EXISTS p2024082022 VALUES IN (("2024-08-20", "22"))
+    """
+    sql """
+        INSERT INTO ${tbl} VALUES("1","1","2024-08-20","21","21:00:00","2024-08-20","1724158800000")
+    """
+    sql """
+        INSERT INTO ${tbl} VALUES("2","2","2024-08-20","22","22:00:00","2024-08-20","1724162400000")
+    """
+
+    // modify table default buckets
+    sql """
+        ALTER TABLE ${tbl} MODIFY DISTRIBUTION DISTRIBUTED BY HASH(`id1`,`id2`) BUCKETS 2
+    """
+
+    // add new partition after modify tablet default buckets and insert values
+    sql """
+        ALTER TABLE ${tbl} ADD PARTITION IF NOT EXISTS p2024082023 VALUES IN (("2024-08-20", "23"))
+    """
+    sql """
+        INSERT INTO ${tbl} VALUES("3","3","2024-08-20","23","23:00:00","2024-08-20","1724166000000")
+    """
+
+    // check all insert values
+    qt_select """
+        SELECT * FROM ${tbl} ORDER BY id1,id2
+    """
+
+    // check all partition buckets
+    List<List<Object>> res1 = sql """
+        SHOW PARTITIONS FROM ${tbl} ORDER BY `PartitionName`
+    """
+    assertEquals(res1[0][8],"1")
+    assertEquals(res1[1][8],"1")
+    assertEquals(res1[2][8],"2")
+
+    sql "DROP TABLE IF EXISTS ${tbl} FORCE"
+}