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https://issues.apache.org/jira/browse/FLINK-2812?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Márton Balassi closed FLINK-2812.
---------------------------------
Resolution: Fixed
Fix Version/s: 0.10
Fixed via e494c27.
> KeySelectorUtil.getSelectorForKeys and TypeExtractor.getKeySelectorTypes are
> incompatible
> -----------------------------------------------------------------------------------------
>
> Key: FLINK-2812
> URL: https://issues.apache.org/jira/browse/FLINK-2812
> Project: Flink
> Issue Type: Bug
> Components: Streaming, Type Serialization System
> Affects Versions: 0.10
> Reporter: Márton Balassi
> Assignee: Márton Balassi
> Priority: Minor
> Labels: typeinfo
> Fix For: 0.10
>
>
> The following code snippet fails, because
> {{KeySelectorUtil.getSelectorForKeys}} returns the base {{Tuple}} type.
> ```java
> TypeInformation<Tuple2<Integer, Integer>> typeInfo = TypeExtractor
> .getForObject(Tuple2.of(0, 0));
> ExecutionConfig config = new ExecutionConfig();
> KeySelector<Tuple2<Integer, Integer>, ?> keySelector =
> KeySelectorUtil.getSelectorForKeys(
> new Keys.ExpressionKeys<>(new int[]{0}, typeInfo), typeInfo, config);
> // fails with InvalidTypesException
> TypeExtractor.getKeySelectorTypes(keySelector, typeInfo);
> ```
> However if I manually define the key selector as follows the snippet works
> fine due to the key type being an integer.
> ```java
> KeySelector<Tuple2<Integer, Integer>, Integer> keySelector =
> new KeySelector<Tuple2<Integer, Integer>, Integer>() {
> @Override
> public Integer getKey(Tuple2<Integer, Integer> value) throws Exception {
> return value.f0;
> }
> };
> ```
> The error message looks like this:
> org.apache.flink.api.common.functions.InvalidTypesException: Usage of class
> Tuple as a type is not allowed. Use a concrete subclass (e.g. Tuple1, Tuple2,
> etc.) instead.
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:401)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:379)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getUnaryOperatorReturnType(TypeExtractor.java:279)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:229)
> at
> org.apache.flink.api.java.typeutils.TypeExtractor.getKeySelectorTypes(TypeExtractor.java:223)
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