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[FLINK-38520][postgres] Postgres YAML CDC support array with null element #4254

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Merged
lvyanquan merged 1 commit into from
Feb 2, 2026
Merged

[FLINK-38520][postgres] Postgres YAML CDC support array with null element #4254

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63 changes: 62 additions & 1 deletion ...rc/test/java/org/apache/flink/cdc/connectors/postgres/source/PostgresFullTypesITCase.java
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Original file line number Diff line number Diff line change
Expand Up @@ -910,10 +910,65 @@ public void testArrayTypesUnsupportedMatrix() throws Exception {
} catch (Exception e) {
Assertions.assertThat(getRootCause(e))
.hasMessage(
"Unable convert multidimensional array value '[null, null]' to a flat array.");
"Unable to convert multidimensional array value '[null, null]' to a flat array.");
}
}

@Test
public void testArrayTypesWithNull() throws Exception {
initializePostgresTable(POSTGIS_CONTAINER, "column_type_test");

PostgresSourceConfigFactory configFactory =
(PostgresSourceConfigFactory)
new PostgresSourceConfigFactory()
.hostname(POSTGIS_CONTAINER.getHost())
.port(POSTGIS_CONTAINER.getMappedPort(POSTGRESQL_PORT))
.username(TEST_USER)
.password(TEST_PASSWORD)
.databaseList(POSTGRES_CONTAINER.getDatabaseName())
.tableList("inventory.array_types_with_null")
.startupOptions(StartupOptions.initial())
.serverTimeZone("UTC");
configFactory.database(POSTGRES_CONTAINER.getDatabaseName());
configFactory.slotName(slotName);
configFactory.decodingPluginName("pgoutput");

FlinkSourceProvider sourceProvider =
(FlinkSourceProvider)
new PostgresDataSource(configFactory).getEventSourceProvider();

CloseableIterator<Event> events =
env.fromSource(
sourceProvider.getSource(),
WatermarkStrategy.noWatermarks(),
PostgresDataSourceFactory.IDENTIFIER,
new EventTypeInfo())
.executeAndCollect();

List<Event> snapshotResults = fetchResultsAndCreateTableEvent(events, 1).f0;
RecordData snapshotRecord = ((DataChangeEvent) snapshotResults.get(0)).after();

Object[] actualSnapshotObjects = recordFields(snapshotRecord, ARRAY_TYPES_WITH_NULL);

Assertions.assertThat(actualSnapshotObjects[0]).isEqualTo(1); // id column

// Test text array with null element: ARRAY['hello', NULL, 'world']
ArrayData actualTextArray = (ArrayData) actualSnapshotObjects[1];
Assertions.assertThat(actualTextArray.size()).isEqualTo(3);
Assertions.assertThat(actualTextArray.getString(0))
.isEqualTo(BinaryStringData.fromString("hello"));
Assertions.assertThat(actualTextArray.isNullAt(1)).isTrue();
Assertions.assertThat(actualTextArray.getString(2))
.isEqualTo(BinaryStringData.fromString("world"));

// Test integer array with null element: ARRAY[1, NULL, 3]
ArrayData actualIntArray = (ArrayData) actualSnapshotObjects[2];
Assertions.assertThat(actualIntArray.size()).isEqualTo(3);
Assertions.assertThat(actualIntArray.getInt(0)).isEqualTo(1);
Assertions.assertThat(actualIntArray.isNullAt(1)).isTrue();
Assertions.assertThat(actualIntArray.getInt(2)).isEqualTo(3);
}

public Throwable getRootCause(Throwable throwable) {
Throwable cause = throwable;
while (cause.getCause() != null && cause.getCause() != cause) {
Expand Down Expand Up @@ -1064,6 +1119,12 @@ private Instant toInstant(String ts) {
DataTypes.ARRAY(DataTypes.INT()),
DataTypes.ARRAY(DataTypes.INT()));

private static final RowType ARRAY_TYPES_WITH_NULL =
RowType.of(
DataTypes.INT(),
DataTypes.ARRAY(DataTypes.STRING()),
DataTypes.ARRAY(DataTypes.INT()));

private static final RowType ARRAY_TYPES_MATRIX =
RowType.of(DataTypes.INT(), DataTypes.ARRAY(DataTypes.ARRAY(DataTypes.INT())));
}
16 changes: 16 additions & 0 deletions ...nectors/flink-cdc-pipeline-connector-postgres/src/test/resources/ddl/column_type_test.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,22 @@ VALUES
'{42}'
);

CREATE TABLE array_types_with_null (
id SERIAL PRIMARY KEY,
text_a1 TEXT[],
int_a1 INTEGER[]
);

ALTER TABLE inventory.array_types_with_null
REPLICA IDENTITY FULL;

INSERT INTO array_types_with_null (id, text_a1, int_a1)
VALUES
(1,
ARRAY['hello', NULL, 'world'],
ARRAY[1, NULL, 3]
);

CREATE TABLE array_types_unsupported_matrix (
id SERIAL PRIMARY KEY,
matrix_a1 INTEGER[][]
Expand Down
25 changes: 13 additions & 12 deletions ...src/main/java/org/apache/flink/cdc/debezium/event/DebeziumEventDeserializationSchema.java
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Original file line number Diff line number Diff line change
Expand Up @@ -504,6 +504,13 @@ protected Object convertToArray(Object dbzObj, Schema schema) throws Exception {
}

Schema elementSchema = schema.valueSchema();
// Multidimensional arrays are not supported
if (elementSchema.type() == Schema.Type.ARRAY) {
throw new IllegalArgumentException(
"Unable to convert multidimensional array value '"
+ dbzObj
+ "' to a flat array.");
}
DataType elementType = schemaDataTypeInference.infer(null, elementSchema);
DeserializationRuntimeConverter elementConverter = getOrCreateConverter(elementType);

Expand All @@ -513,13 +520,10 @@ protected Object convertToArray(Object dbzObj, Schema schema) throws Exception {

for (int i = 0; i < list.size(); i++) {
Object element = list.get(i);
if (element != null && elementSchema.type() != Schema.Type.ARRAY) {
array[i] = elementConverter.convert(element, elementSchema);
if (element == null) {
array[i] = null;
} else {
throw new IllegalArgumentException(
"Unable convert multidimensional array value '"
+ dbzObj
+ "' to a flat array.");
array[i] = elementConverter.convert(element, elementSchema);
}
}

Expand All @@ -529,13 +533,10 @@ protected Object convertToArray(Object dbzObj, Schema schema) throws Exception {
Object[] convertedArray = new Object[inputArray.length];

for (int i = 0; i < inputArray.length; i++) {
if (inputArray[i] != null && elementSchema.type() != Schema.Type.ARRAY) {
convertedArray[i] = elementConverter.convert(inputArray[i], elementSchema);
if (inputArray[i] == null) {
convertedArray[i] = null;
} else {
throw new IllegalArgumentException(
"Unable convert multidimensional array value '"
+ dbzObj
+ "' to a flat array.");
convertedArray[i] = elementConverter.convert(inputArray[i], elementSchema);
}
}

Expand Down
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