damccorm opened a new issue, #19703:
URL: https://github.com/apache/beam/issues/19703
Below is the scenario tried:
```
public void testMapWithNullRowAsValue() {
Schema primitiveFieldsScema =
Schema.builder().addNullableField("color",
FieldType.STRING).build();
FieldType valueType = FieldType.row(primitiveFieldsScema).withNullable(true);
Schema inputSchema =
Schema.builder()
.addNullableField("mapWithValueAsRow",
FieldType.map(FieldType.STRING, valueType))
.build();
Map<String,
Row> mapWithValueAsNullRow = new HashMap<>();
mapWithValueAsNullRow.put("key", null); // Setting
value of map as NULL
Row rowOfMap = Row.withSchema(inputSchema)
.addValue(mapWithValueAsNullRow)
.build();
pipeline.apply(Create.of(rowOfMap)).setRowSchema(inputSchema);
pipeline.run().waitUntilFinish(Duration.standardMinutes(1));
}
```
Below NPE is seen:
```
java.lang.NullPointerException
at
org.apache.beam.sdk.coders.RowCoderGenerator$EncodeInstruction.encodeDelegate(RowCoderGenerator.java:225)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$DifqoQx1.encode(Unknown
Source)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$DifqoQx1.encode(Unknown
Source)
at org.apache.beam.sdk.coders.MapCoder.encode(MapCoder.java:96)
at org.apache.beam.sdk.coders.MapCoder.encode(MapCoder.java:69)
at org.apache.beam.sdk.coders.MapCoder.encode(MapCoder.java:43)
at
org.apache.beam.sdk.coders.RowCoderGenerator$EncodeInstruction.encodeDelegate(RowCoderGenerator.java:234)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$9dwdE80N.encode(Unknown
Source)
at org.apache.beam.sdk.coders.Coder$ByteBuddy$9dwdE80N.encode(Unknown
Source)
at org.apache.beam.sdk.coders.RowCoder.encode(RowCoder.java:145)
at org.apache.beam.sdk.schemas.SchemaCoder.encode(SchemaCoder.java:81)
at org.apache.beam.sdk.coders.Coder.encode(Coder.java:136)
at
org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:82)
at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:66)
at
org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:51)
at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:141)
at
org.apache.beam.sdk.util.MutationDetectors$CodedValueMutationDetector.<init>(MutationDetectors.java:113)
at
org.apache.beam.sdk.util.MutationDetectors.forValueWithCoder(MutationDetectors.java:44)
at
org.apache.beam.runners.direct.ImmutabilityCheckingBundleFactory$ImmutabilityEnforcingBundle.add(ImmutabilityCheckingBundleFactory.java:112)
at
org.apache.beam.runners.direct.BoundedReadEvaluatorFactory$BoundedReadEvaluator.processElement(BoundedReadEvaluatorFactory.java:151)
at
org.apache.beam.runners.direct.DirectTransformExecutor.processElements(DirectTransformExecutor.java:160)
at
org.apache.beam.runners.direct.DirectTransformExecutor.run(DirectTransformExecutor.java:124)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
```
Imported from Jira
[BEAM-7841](https://issues.apache.org/jira/browse/BEAM-7841). Original Jira may
contain additional context.
Reported by: vbm.
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