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https://issues.apache.org/jira/browse/FLINK-2637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14791822#comment-14791822
 ] 

ASF GitHub Bot commented on FLINK-2637:
---------------------------------------

Github user tillrohrmann commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1134#discussion_r39725082
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/api/common/typeinfo/IntegerTypeInfo.java
 ---
    @@ -18,15 +18,33 @@
     
     package org.apache.flink.api.common.typeinfo;
     
    +import com.google.common.base.Preconditions;
    +import com.google.common.collect.Sets;
     import org.apache.flink.api.common.typeutils.TypeComparator;
     import org.apache.flink.api.common.typeutils.TypeSerializer;
     
    +import java.util.Set;
    +
     /**
    - * Type information for numeric primitive types (int, long, double, byte, 
...).
    + * Type information for numeric integer primitive types: int, long, byte, 
short, boolean, character.
      */
     public class IntegerTypeInfo<T> extends NumericTypeInfo<T> {
     
    +   private static final long serialVersionUID = -8068827354966766955L;
    +
    +   private static final Set<Class<?>> integerTypes = 
Sets.<Class<?>>newHashSet(
    +                   Integer.class,
    +                   Long.class,
    +                   Byte.class,
    +                   Short.class,
    +                   Boolean.class,
    --- End diff --
    
    Nope, I missed that. Will remove it.


> Add abstract equals, hashCode and toString methods to TypeInformation
> ---------------------------------------------------------------------
>
>                 Key: FLINK-2637
>                 URL: https://issues.apache.org/jira/browse/FLINK-2637
>             Project: Flink
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.9, 0.10
>            Reporter: Fabian Hueske
>            Assignee: Till Rohrmann
>              Labels: starter
>             Fix For: 0.10
>
>
> Flink expects that implementations of {{TypeInformation}} have valid 
> implementations of {{hashCode}} and {{equals}}. However, the API does not 
> enforce to implement these methods. Hence, this is a common origin for bugs 
> such as for example FLINK-2633.
> This can be avoided by adding abstract {{hashCode}} and {{equals}} methods to 
> TypeInformation. An abstract {{toString}} method could also be added.
> This change will brake the API and require to fix a couple of broken 
> {{TypeInformation}} implementations.



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