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[cdc] Fix NPE when metadata columns are used with debezium-bson format #9055

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Merged
JingsongLi merged 1 commit into from
Aug 7, 2026
+40 −0
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[cdc] Fix NPE when metadata columns are used with debezium-bson format #9055

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4 changes: 4 additions & 0 deletions ...ain/java/org/apache/paimon/flink/action/cdc/format/debezium/DebeziumBsonRecordParser.java
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,10 @@ public List<RichCdcMultiplexRecord> extractRecords() {

@Override
protected void setRoot(CdcSourceRecord record) {
// Store current record for metadata access. Assign the field directly instead of calling
// super.setRoot, because DebeziumJsonRecordParser#setRoot also parses the Debezium value
// schema, which carries no field information for BSON documents.
this.currentRecord = record;
root = (JsonNode) record.getValue();
if (root.has(FIELD_SCHEMA)) {
root = root.get(FIELD_PAYLOAD);
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36 changes: 36 additions & 0 deletions ...java/org/apache/paimon/flink/action/cdc/format/debezium/DebeziumBsonRecordParserTest.java
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Expand Up @@ -18,14 +18,17 @@

package org.apache.paimon.flink.action.cdc.format.debezium;

import org.apache.paimon.flink.action.cdc.CdcMetadataConverter;
import org.apache.paimon.flink.action.cdc.CdcSourceRecord;
import org.apache.paimon.flink.action.cdc.TypeMapping;
import org.apache.paimon.flink.action.cdc.format.DataFormat;
import org.apache.paimon.flink.action.cdc.kafka.KafkaMetadataConverter;
import org.apache.paimon.flink.action.cdc.watermark.MessageQueueCdcTimestampExtractor;
import org.apache.paimon.flink.sink.cdc.CdcRecord;
import org.apache.paimon.flink.sink.cdc.CdcSchema;
import org.apache.paimon.flink.sink.cdc.RichCdcMultiplexRecord;
import org.apache.paimon.schema.Schema;
import org.apache.paimon.types.DataField;
import org.apache.paimon.types.RowKind;
import org.apache.paimon.utils.JsonSerdeUtil;
import org.apache.paimon.utils.StringUtils;
Expand All @@ -51,6 +54,7 @@
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/** Test for DebeziumBsonRecordParser. */
public class DebeziumBsonRecordParserTest {
Expand Down Expand Up @@ -228,6 +232,38 @@ public void extractDeleteRecord() throws Exception {
}
}

@Test
public void extractRecordWithMetadataColumns() throws Exception {
DebeziumBsonRecordParser parser =
new DebeziumBsonRecordParser(TypeMapping.defaultMapping(), Collections.emptyList());
parser.withMetadataConverters(
new CdcMetadataConverter[] {
new KafkaMetadataConverter.TopicConverter(),
new KafkaMetadataConverter.OffsetConverter()
});

Assertions.assertFalse(insertList.isEmpty());
for (CdcSourceRecord cdcRecord : insertList) {
List<RichCdcMultiplexRecord> records = new ArrayList<>();
parser.flatMap(cdcRecord, new ListCollector<>(records));
Assertions.assertEquals(1, records.size());

Map<String, String> expected = new HashMap<>(beforeEvent);
expected.put("topic", "topic");
expected.put("offset", "0");

CdcRecord result = records.get(0).toRichCdcRecord().toCdcRecord();
Assertions.assertEquals(RowKind.INSERT, result.kind());
Assertions.assertEquals(expected, result.data());

List<String> fieldNames =
records.get(0).buildSchema().fields().stream()
.map(DataField::name)
.collect(Collectors.toList());
Assertions.assertTrue(fieldNames.containsAll(Arrays.asList("topic", "offset")));
}
}

@Test
public void bsonConvertJsonTest() throws Exception {
DebeziumBsonRecordParser parser =
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