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new 743b6e90a3 [flink] Fix ClassCastException in MongoDB CDC JsonPath
extraction (#6113)
743b6e90a3 is described below
commit 743b6e90a324b58f07832eea8680e5b9afb7da07
Author: Arnav Balyan <[email protected]>
AuthorDate: Wed Aug 27 07:45:22 2025 +0530
[flink] Fix ClassCastException in MongoDB CDC JsonPath extraction (#6113)
---
.../cdc/mongodb/strategy/MongoVersionStrategy.java | 5 +-
.../mongodb/strategy/MongoVersionStrategyTest.java | 80 ++++++++++++++++++++++
2 files changed, 83 insertions(+), 2 deletions(-)
diff --git
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/mongodb/strategy/MongoVersionStrategy.java
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/mongodb/strategy/MongoVersionStrategy.java
index baea947276..a41a1eec68 100644
---
a/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/mongodb/strategy/MongoVersionStrategy.java
+++
b/paimon-flink/paimon-flink-cdc/src/main/java/org/apache/paimon/flink/action/cdc/mongodb/strategy/MongoVersionStrategy.java
@@ -133,8 +133,9 @@ public interface MongoVersionStrategy {
Map<String, String> parsedRow = new HashMap<>();
for (int i = 0; i < parseNames.length; i++) {
- String evaluate = JsonPath.read(record, parseNames[i]);
- parsedRow.put(columnNames[i],
Optional.ofNullable(evaluate).orElse("{}"));
+ Object evaluate = JsonPath.read(record, parseNames[i]);
+ String stringValue = evaluate != null ? evaluate.toString() : null;
+ parsedRow.put(columnNames[i],
Optional.ofNullable(stringValue).orElse("{}"));
}
return processParsedData(parsedRow, schemaBuilder, computedColumns);
diff --git
a/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/mongodb/strategy/MongoVersionStrategyTest.java
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/mongodb/strategy/MongoVersionStrategyTest.java
new file mode 100644
index 0000000000..ea45a2041c
--- /dev/null
+++
b/paimon-flink/paimon-flink-cdc/src/test/java/org/apache/paimon/flink/action/cdc/mongodb/strategy/MongoVersionStrategyTest.java
@@ -0,0 +1,80 @@
+/*
+ * 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.paimon.flink.action.cdc.mongodb.strategy;
+
+import org.apache.paimon.flink.sink.cdc.CdcSchema;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.Collections;
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/** Test for {@link MongoVersionStrategy}. */
+class MongoVersionStrategyTest {
+
+ @Test
+ void testParseFieldsFromJsonRecordWithDoubleValue() {
+ String record =
+ "{"
+ + "\n \"_id\": {\"$oid\":
\"507f1f77bcf86cd799439011\"},"
+ + "\n \"name\": \"John Doe\","
+ + "\n \"age\": 30,"
+ + "\n \"price\": 19.99,"
+ + "\n \"active\": true"
+ + "\n}";
+
+ String fieldPaths = "$.name,$.age,$.price,$.active";
+ String fieldNames = "name,age,price,active";
+
+ CdcSchema.Builder schemaBuilder = CdcSchema.newBuilder();
+
+ Map<String, String> result =
+ MongoVersionStrategy.parseFieldsFromJsonRecord(
+ record, fieldPaths, fieldNames,
Collections.emptyList(), schemaBuilder);
+
+ assertThat(result).containsEntry("name", "John Doe");
+ assertThat(result).containsEntry("age", "30");
+ assertThat(result).containsEntry("price", "19.99");
+ assertThat(result).containsEntry("active", "true");
+ }
+
+ @Test
+ void testParseFieldsFromJsonRecordWithStringValues() {
+ String record =
+ "{"
+ + "\n \"_id\": {\"$oid\":
\"507f1f77bcf86cd799439011\"},"
+ + "\n \"name\": \"John Doe\","
+ + "\n \"description\": \"A sample record\""
+ + "\n}";
+
+ String fieldPaths = "$.name,$.description";
+ String fieldNames = "name,description";
+
+ CdcSchema.Builder schemaBuilder = CdcSchema.newBuilder();
+
+ Map<String, String> result =
+ MongoVersionStrategy.parseFieldsFromJsonRecord(
+ record, fieldPaths, fieldNames,
Collections.emptyList(), schemaBuilder);
+
+ assertThat(result).containsEntry("name", "John Doe");
+ assertThat(result).containsEntry("description", "A sample record");
+ }
+}
