Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2147#discussion_r138618390
--- Diff:
nifi-commons/nifi-record-path/src/main/java/org/apache/nifi/record/path/paths/WildcardDescendantPath.java
---
@@ -0,0 +1,74 @@
+/*
+ * 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.nifi.record.path.paths;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.stream.Stream;
+
+import org.apache.nifi.record.path.FieldValue;
+import org.apache.nifi.record.path.RecordPathEvaluationContext;
+import org.apache.nifi.record.path.StandardFieldValue;
+import org.apache.nifi.record.path.util.Filters;
+import org.apache.nifi.serialization.record.Record;
+import org.apache.nifi.serialization.record.RecordField;
+
+public class WildcardDescendantPath extends RecordPathSegment {
+
+ WildcardDescendantPath(final RecordPathSegment parent, final boolean
absolute) {
+ super("/*", parent, absolute);
+ }
+
+ @Override
+ public Stream<FieldValue> evaluate(final RecordPathEvaluationContext
context) {
+ final Stream<FieldValue> parentResult =
getParentPath().evaluate(context);
+
+ return parentResult
+ .flatMap(recordFieldVal ->
findDescendants(recordFieldVal).stream());
+ }
+
+ private List<FieldValue> findDescendants(final FieldValue fieldValue) {
+ if (fieldValue == null || fieldValue.getValue() == null) {
+ return Collections.emptyList();
+ }
+ if (!Filters.isRecord(fieldValue)) {
+ return Collections.emptyList();
+ }
+
+ final Record record = (Record) fieldValue.getValue();
--- End diff --
Actually I think this is addressed already online 47:
```
if (fieldValue == null || fieldValue.getValue() == null) {
return Collections.emptyList();
}
```
---
