[Fix][Common] Problems with comma-separated logic in variable values during variable substitution.(#9151)

Author: qifanlili

Diff for: seatunnel-core/seatunnel-core-starter/src/main/java/org/apache/seatunnel/core/starter/command/ParameterSplitter.java

@@ -50,9 +50,21 @@ public List<String> split(String value) {
         }
 
         if (currentToken.length() > 0) {
-            result.add(currentToken.toString().trim());
+            String token = processToken(currentToken.toString().trim());
+            result.add(token);
         }
 
         return result;
     }
-}
+
+    private String processToken(String token) {
+        int eqIdx = token.indexOf('=');
+        if (eqIdx <= 0 || eqIdx == token.length() - 1) {
+            return token;
+        }
+        String key = token.substring(0, eqIdx);
+        String val = token.substring(eqIdx + 1).trim();
+        val = val.replaceAll("^\"|\"$", "");
+        return String.format("%s=%s", key, val);
+    }
+}

Diff for: seatunnel-core/seatunnel-core-starter/src/test/java/org/apache/seatunnel/core/starter/utils/ParameterSplitterTest.java

@@ -0,0 +1,41 @@
+/*
+ * 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.core.starter.utils;
+
+import org.apache.seatunnel.common.utils.PlaceholderUtils;
+import org.apache.seatunnel.core.starter.command.ParameterSplitter;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.*;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ParameterSplitterTest {
+
+    @Test
+    public void testSplit() {
+        String value = "columns=\"c_id,c_area_code,c_date\"";
+
+        ParameterSplitter parameterSplitter = new ParameterSplitter();
+        List<String> result = parameterSplitter.split(value);
+
+        assertEquals(1, result.size());
+        assertEquals("columns=c_id,c_area_code,c_date", result.get(0));
+    }
+}