[Hotfix][Transform][Sql] function concat_ws handle array type， avoid write [Ljava.lang.String. (#8369)

Author: sohurdc

seatunnel-transforms-v2/src/main/java/org/apache/seatunnel/transform/sql/zeta/functions/StringFunction.java

@@ -23,12 +23,16 @@
 
 import org.apache.groovy.parser.antlr4.util.StringUtils;
 
+import java.lang.reflect.Array;
 import java.nio.charset.StandardCharsets;
 import java.time.temporal.Temporal;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 public class StringFunction {
     private static final byte[] SOUNDEX_INDEX =
@@ -105,7 +109,22 @@ public static String concatWs(List<Object> args) {
                 }
                 f = true;
             }
-            builder.append(arg);
+            if (arg.getClass().isArray()) {
+                int len = Array.getLength(arg);
+                List<Object> ll = new ArrayList<>();
+                for (int j = 0; j < len; j++) {
+                    Object o = Array.get(arg, j);
+                    ll.add(o);
+                }
+                String s =
+                        ll.stream()
+                                .filter(Objects::nonNull)
+                                .map(Object::toString)
+                                .collect(Collectors.joining(separator != null ? separator : ""));
+                builder.append(s);
+            } else {
+                builder.append(arg);
+            }
         }
         return builder.toString();
     }

seatunnel-transforms-v2/src/test/java/org/apache/seatunnel/transform/sql/zeta/ConcatWsFunctionTest.java

@@ -0,0 +1,67 @@
+/*
+ * 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.seatunnel.transform.sql.zeta;
+
+import org.apache.seatunnel.transform.sql.zeta.functions.StringFunction;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class ConcatWsFunctionTest {
+
+    @Test
+    public void testConcatWs() {
+        Assertions.assertEquals("", StringFunction.concatWs(genArgs(";", new String[] {})));
+        Assertions.assertEquals("", StringFunction.concatWs(genArgs(null, new String[] {})));
+        Assertions.assertEquals(
+                "a;b", StringFunction.concatWs(genArgs(";", new String[] {"a", "b"})));
+        Assertions.assertEquals(
+                "a;b", StringFunction.concatWs(genArgs(";", new String[] {"a", null, "b"})));
+        Assertions.assertEquals(
+                "ab",
+                StringFunction.concatWs(genArgs("", new String[] {null, "a", null, "b", null})));
+        Assertions.assertEquals(
+                "ab", StringFunction.concatWs(genArgs(null, new String[] {"a", "b", null})));
+        Assertions.assertEquals(
+                "a;b;c", StringFunction.concatWs(genArgs(";", new String[] {"a", "b"}, "c")));
+        Assertions.assertEquals(
+                "a;b", StringFunction.concatWs(genArgs(";", new String[] {"a", "b"}, null)));
+        Assertions.assertEquals(
+                "a;b;1;2",
+                StringFunction.concatWs(
+                        genArgs(";", new String[] {"a", "b"}, new String[] {"1", "2"})));
+    }
+
+    public List<Object> genArgs(String separator, String[] arr) {
+        List<Object> list = new ArrayList<>();
+        list.add(separator);
+        list.add(arr);
+        return list;
+    }
+
+    public List<Object> genArgs(String separator, Object... arr) {
+        List<Object> list = new ArrayList<>();
+        list.add(separator);
+        Collections.addAll(list, arr);
+        return list;
+    }
+}