Gallardot commented on code in PR #14934:
URL: 
https://github.com/apache/dolphinscheduler/pull/14934#discussion_r1339842222


##########
dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/main/java/org/apache/dolphinscheduler/plugin/task/api/utils/VarPoolUtils.java:
##########
@@ -0,0 +1,47 @@
+/*
+ * 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.dolphinscheduler.plugin.task.api.utils;
+
+import org.apache.dolphinscheduler.plugin.task.api.TaskConstants;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import lombok.experimental.UtilityClass;
+
+@UtilityClass
+public class VarPoolUtils {
+
+    static final Pattern DSVALUE_REGEX = 
Pattern.compile(TaskConstants.DSVALUE_REGEX);
+    public static final String VAR_SUFFIX = ")dsVal}";
+
+    public static final String VAR_DELIMITER = "$VarPool$";
+    /**
+     * find var pool
+     *
+     * @param line
+     * @return
+     */
+    public static String findVarPool(String line) {
+        Matcher matcher = DSVALUE_REGEX.matcher(line);
+        if (matcher.find()) {
+            return matcher.group(1);
+        }
+        return null;

Review Comment:
   If the value is null, subsequent processing will ignore that null value 
data. 
ref:[getMapByString](https://github.com/apache/dolphinscheduler/blob/dev/dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/main/java/org/apache/dolphinscheduler/plugin/task/api/parameters/AbstractParameters.java#L186-L196)



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