branch-2.1:[statistics](regression)Add utf-8 encoding regression test. (#50466) (#51016)

backport: https://github.com/apache/doris/pull/50466

regression-test/suites/statistics/test_utf_encoding.groovy

@@ -0,0 +1,53 @@
+// 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_utf_encoding") {
+
+    sql """drop database if exists test_utf_encoding"""
+    sql """create database test_utf_encoding"""
+    sql """use test_utf_encoding"""
+    sql """set global enable_auto_analyze=false"""
+
+    sql """CREATE TABLE t1 (
+            col1 int NOT NULL,
+            col2 string NOT NULL
+        )ENGINE=OLAP
+        DUPLICATE KEY(`col1`)
+        COMMENT "OLAP"
+        DISTRIBUTED BY HASH(`col1`) BUCKETS 1
+        PROPERTIES (
+            "replication_num" = "1"
+        )
+    """
+
+    sql """insert into t1 values (1, "一般风险准备"), (2, "预计负债")"""
+    sql """analyze table t1 with sync"""
+    def result =  sql """show column stats t1(col2)"""
+    assertEquals("\'一般风险准备\'", result[0][7])
+    assertEquals("\'预计负债\'", result[0][8])
+    result =  sql"""show column cached stats t1(col2)"""
+    assertEquals("\'一般风险准备\'", result[0][7])
+    assertEquals("\'预计负债\'", result[0][8])
+    explain {
+        sql """memo plan select * from t1;"""
+        contains("min=64379158486625512.000000(一般风险准备)")
+        contains("max=65762361296724456.000000(预计负债)")
+    }
+
+    sql """drop database if exists test_utf_encoding"""
+}
+