update

fe/be-java-extensions/java-udf/src/main/java/org/apache/doris/udf/UdfConvert.java

@@ -1270,7 +1270,7 @@ public static long copyBatchArrayStringResult(long hasPutElementNum, boolean isN
                     offset += byteRes[i].length;
                     offsets[i] = offset;
                 }
-                int oldSzie = 0;
+                int oldSzie = oldOffsetNum;
                 if (num > 0) {
                     oldSzie = offsets[num - 1];
                 }
@@ -1305,11 +1305,11 @@ public static long copyBatchArrayStringResult(long hasPutElementNum, boolean isN
                 offset += byteRes[i].length;
                 offsets[i] = offset;
             }
-            int oldSzie = 0;
+            int oldSzie = oldOffsetNum;
             if (num > 0) {
                 oldSzie = offsets[num - 1];
             }
-            byte[] bytes = new byte[oldSzie];
+            byte[] bytes = new byte[oldSzie - oldOffsetNum];
             long bytesAddr = JNINativeMethod.resizeStringColumn(dataAddr, oldSzie);
             int dst = 0;
             for (int i = 0; i < num; i++) {

regression-test/data/javaudf_p0/test_javaudf_array.out

@@ -131,3 +131,15 @@ a10b10	20
 ["2022-01-01"]	18
 ["2022-06-06"]	20
 
+-- !select_14 --
+["111", "aaa", null]	1
+[]	2
+[]	3
+[]	4
+[]	5
+[]	6
+[]	7
+[]	8
+[]	9
+[]	10
+

regression-test/java-udf-src/src/main/java/org/apache/doris/udf/ArrayReturnArrayStringTest2.java

@@ -0,0 +1,40 @@
+// 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.
+
+package org.apache.doris.udf;
+
+import java.util.ArrayList;
+
+public class ArrayReturnArrayStringTest2 {
+    public ArrayList<String> evaluate(Integer res) {
+        ArrayList<String> result = new ArrayList<String>();
+        if (res == null) {
+            return null;
+        }
+        switch (res.intValue()) {
+            case 1: {
+                result.add("111");
+                result.add("aaa");
+                result.add(null);
+            }
+            break;
+            default:
+                break;
+        }
+        return result;
+    }
+}

regression-test/suites/javaudf_p0/test_javaudf_array.groovy

@@ -117,10 +117,19 @@ suite("test_javaudf_array") {
         ); """
         qt_select_13 """ SELECT java_udf_array_date_test(array(datev2_col)), tinyint_col as result FROM ${tableName} ORDER BY result; """
 
+        sql """ DROP FUNCTION IF EXISTS java_udf_array_return_string_test2(array<string>); """
+        sql """ CREATE FUNCTION java_udf_array_return_string_test2(int) RETURNS array<string> PROPERTIES (
+            "file"="file://${jarPath}",
+            "symbol"="org.apache.doris.udf.ArrayReturnArrayStringTest2",
+            "type"="JAVA_UDF"
+        ); """
+        qt_select_14 """ SELECT java_udf_array_return_string_test2(user_id), user_id as result FROM ${tableName} ORDER BY result; """
+
     } finally {
         try_sql("DROP FUNCTION IF EXISTS java_udf_array_int_test(array<int>);")
         try_sql("DROP FUNCTION IF EXISTS java_udf_array_return_int_test(array<int>);")
         try_sql("DROP FUNCTION IF EXISTS java_udf_array_return_string_test(array<string>);")
+        try_sql("DROP FUNCTION IF EXISTS java_udf_array_return_string_test2(int);")
         try_sql("DROP FUNCTION IF EXISTS java_udf_array_string_test(array<string>);")
         try_sql("DROP FUNCTION IF EXISTS java_udf_array_datatime_test(array<datetime>);")
         try_sql("DROP FUNCTION IF EXISTS java_udf_array_date_test(array<date>);")