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KAFKA-12522: Cast SMT should allow null value records to pass through #10375

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May 21, 2021
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KAFKA-12522: Cast SMT should allow null value records to pass through #10375

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4 changes: 4 additions & 0 deletions connect/transforms/src/main/java/org/apache/kafka/connect/transforms/Cast.java
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Original file line number Diff line number Diff line change
Expand Up @@ -120,6 +120,10 @@ public void configure(Map<String, ?> props) {

@Override
public R apply(R record) {
if (operatingValue(record) == null) {
return record;
}

if (operatingSchema(record) == null) {
return applySchemaless(record);
} else {
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36 changes: 36 additions & 0 deletions connect/transforms/src/test/java/org/apache/kafka/connect/transforms/CastTest.java
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Expand Up @@ -89,6 +89,42 @@ public void testConfigMixWholeAndFieldTransformation() {
assertThrows(ConfigException.class, () -> xformKey.configure(Collections.singletonMap(Cast.SPEC_CONFIG, "foo:int8,int32")));
}

@Test
public void castNullValueRecordWithSchema() {
xformValue.configure(Collections.singletonMap(Cast.SPEC_CONFIG, "foo:int64"));
SourceRecord original = new SourceRecord(null, null, "topic", 0,
Schema.STRING_SCHEMA, "key", Schema.STRING_SCHEMA, null);
SourceRecord transformed = xformValue.apply(original);
assertEquals(original, transformed);
}

@Test
public void castNullValueRecordSchemaless() {
xformValue.configure(Collections.singletonMap(Cast.SPEC_CONFIG, "foo:int64"));
SourceRecord original = new SourceRecord(null, null, "topic", 0,
Schema.STRING_SCHEMA, "key", null, null);
SourceRecord transformed = xformValue.apply(original);
assertEquals(original, transformed);
}

@Test
public void castNullKeyRecordWithSchema() {
xformKey.configure(Collections.singletonMap(Cast.SPEC_CONFIG, "foo:int64"));
SourceRecord original = new SourceRecord(null, null, "topic", 0,
Schema.STRING_SCHEMA, null, Schema.STRING_SCHEMA, "value");
SourceRecord transformed = xformKey.apply(original);
assertEquals(original, transformed);
}

@Test
public void castNullKeyRecordSchemaless() {
xformKey.configure(Collections.singletonMap(Cast.SPEC_CONFIG, "foo:int64"));
SourceRecord original = new SourceRecord(null, null, "topic", 0,
null, null, Schema.STRING_SCHEMA, "value");
SourceRecord transformed = xformKey.apply(original);
assertEquals(original, transformed);
}

@Test
public void castWholeRecordKeyWithSchema() {
xformKey.configure(Collections.singletonMap(Cast.SPEC_CONFIG, "int8"));
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