Ron Crocker created FLINK-3697:
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Summary: keyBy() with nested POJO computes invalid field position
indexes
Key: FLINK-3697
URL: https://issues.apache.org/jira/browse/FLINK-3697
Project: Flink
Issue Type: Bug
Components: DataStream API
Affects Versions: 1.0.0
Environment: MacOS X 10.10
Reporter: Ron Crocker
Priority: Minor
Using named keys in keyBy() for nested POJO types results in failure. The
iindexes for named key fields are used inconsistently with nested POJO types.
In particular, {{PojoTypeInfo.getFlatFields()}} returns the field's position
after (apparently) flattening the structure but is referenced in the
unflattened version of the POJO type by {{PojoTypeInfo.getTypeAt()}}.
In the example below, getFlatFields() returns positions 0, 1, and 14. These
positions appear correct in the flattened structure of the Data class. However,
in {{KeySelector<X, Tuple> getSelectorForKeys(Keys<X> keys, TypeInformation<X>
typeInfo, ExecutionConfig executionConfig)}}, a call to
{{compositeType.getTypeAt(logicalKeyPositions[i])}} for the third key results
{{PojoTypeInfo.getTypeAt()}} declaring it out of range, as it compares the
length of the directly named fields of the object vs the length of flattened
version of that type.
Concrete Example:
Consider this graph:
{code}
DataStream<TimesliceData> dataStream = see.addSource(new
FlinkKafkaConsumer08<>(timesliceConstants.topic, new DataDeserialzer(),
kafkaConsumerProperties));
dataStream
.flatMap(new DataMapper())
.keyBy("aaa", "abc", "wxyz")
{code}
{{DataDeserialzer}} returns a "NativeDataFormat" object; {{DataMapper}} takes
this NativeDataFormat object and extracts individual Data objects: {code}
public class Data {
public int aaa;
public int abc;
public long wxyz;
public int t1;
public int t2;
public Policy policy;
public Stats stats;
public Data() {}
{code}
A {{Policy}} object is an instance of this class:
{code}
public class AggregatableMetricStoragePolicy implements MetricStoragePolicy {
public short a;
public short b;
public boolean c;
public boolean d;
public Policy() {}
}
{code}
A {{Stats}} object is an instance of this class:
{code}
public class Stats {
public long count;
public float a;
public float b;
public float c;
public float d;
public float e;
public Stats() {}
}
{code}
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