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KAFKA-8713: JsonConverter replace.null.with.default should apply to Struct fields #13781

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merged 1 commit into from May 31, 2023
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KAFKA-8713: JsonConverter replace.null.with.default should apply to Struct fields #13781

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2 changes: 1 addition & 1 deletion connect/json/src/main/java/org/apache/kafka/connect/json/JsonConverter.java
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Expand Up @@ -661,7 +661,7 @@ else if (value instanceof ByteBuffer)
throw new DataException("Mismatching schema.");
ObjectNode obj = JSON_NODE_FACTORY.objectNode();
for (Field field : schema.fields()) {
obj.set(field.name(), convertToJson(field.schema(), struct.get(field)));
obj.set(field.name(), convertToJson(field.schema(), struct.getWithoutDefault(field.name())));
}
return obj;
}
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39 changes: 39 additions & 0 deletions connect/json/src/test/java/org/apache/kafka/connect/json/JsonConverterTest.java
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Expand Up @@ -921,6 +921,45 @@ public void deserializeNullToNull() {
assertNull(sav.value());
}

@Test
public void serializeFieldNullToDefault() {
converter.configure(Collections.singletonMap(JsonConverterConfig.REPLACE_NULL_WITH_DEFAULT_CONFIG, true), false);
Schema schema = SchemaBuilder.string().optional().defaultValue("default").build();
Schema structSchema = SchemaBuilder.struct().field("field1", schema).build();
JsonNode converted = parse(converter.fromConnectData(TOPIC, structSchema, new Struct(structSchema)));
JsonNode expected = parse("{\"schema\":{\"type\":\"struct\",\"fields\":[{\"field\":\"field1\",\"type\":\"string\",\"optional\":true,\"default\":\"default\"}],\"optional\":false},\"payload\":{\"field1\":\"default\"}}");
assertEquals(expected, converted);
}

@Test
public void serializeFieldNullToNull() {
converter.configure(Collections.singletonMap(JsonConverterConfig.REPLACE_NULL_WITH_DEFAULT_CONFIG, false), false);
Schema schema = SchemaBuilder.string().optional().defaultValue("default").build();
Schema structSchema = SchemaBuilder.struct().field("field1", schema).build();
JsonNode converted = parse(converter.fromConnectData(TOPIC, structSchema, new Struct(structSchema)));
JsonNode expected = parse("{\"schema\":{\"type\":\"struct\",\"fields\":[{\"field\":\"field1\",\"type\":\"string\",\"optional\":true,\"default\":\"default\"}],\"optional\":false},\"payload\":{\"field1\":null}}");
assertEquals(expected, converted);
}

@Test
public void deserializeFieldNullToDefault() {
converter.configure(Collections.singletonMap(JsonConverterConfig.REPLACE_NULL_WITH_DEFAULT_CONFIG, true), false);
String value = "{\"schema\":{\"type\":\"struct\",\"fields\":[{\"field\":\"field1\",\"type\":\"string\",\"optional\":true,\"default\":\"default\"}],\"optional\":false},\"payload\":{\"field1\":null}}";
SchemaAndValue sav = converter.toConnectData(TOPIC, null, value.getBytes());
Schema schema = SchemaBuilder.string().optional().defaultValue("default").build();
Schema structSchema = SchemaBuilder.struct().field("field1", schema).build();
assertEquals(new Struct(structSchema).put("field1", "default"), sav.value());
}

@Test
public void deserializeFieldNullToNull() {
converter.configure(Collections.singletonMap(JsonConverterConfig.REPLACE_NULL_WITH_DEFAULT_CONFIG, false), false);
String value = "{\"schema\":{\"type\":\"struct\",\"fields\":[{\"field\":\"field1\",\"type\":\"string\",\"optional\":true,\"default\":\"default\"}],\"optional\":false},\"payload\":{\"field1\":null}}";
SchemaAndValue sav = converter.toConnectData(TOPIC, null, value.getBytes());
Schema schema = SchemaBuilder.string().optional().defaultValue("default").build();
Schema structSchema = SchemaBuilder.struct().field("field1", schema).build();
assertEquals(new Struct(structSchema), sav.value());
}

private JsonNode parse(byte[] json) {
try {
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