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https://issues.apache.org/jira/browse/AVRO-1128?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ed Kohlwey updated AVRO-1128:
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Summary: SpecificRecord doesn't check for equality correctly with respect
to maps (was: SpecificRecord doesn't check for equality correctly)
> SpecificRecord doesn't check for equality correctly with respect to maps
> ------------------------------------------------------------------------
>
> Key: AVRO-1128
> URL: https://issues.apache.org/jira/browse/AVRO-1128
> Project: Avro
> Issue Type: Bug
> Affects Versions: 1.7.0, 1.7.1
> Reporter: Ed Kohlwey
> Priority: Critical
>
> In Java, map equality is based on the contents of a map rather than ordering,
> since order is undefined in the plain Java map implementation. The present
> implementation of SpecificRecord relies on SpecificData's public compare()
> method, which doesn't expose any method to relax the ordering requirement for
> maps (a protected-visibility implementation exists that does). Since
> specificRecord is based on map (and not some sort of ordered map) the current
> implementation with respect to the Java spec is fundamentally incompatible
> since Java doesn't require a notion of ordering for the Map interface and
> Avro can.
> There's a few ways this could be solved:
> # Require Avro Java to use the LinkedHashMap implementation of map (or
> similar) so that map ordering can be compared and not break the normal
> expectations of a java developer. This is problematic because it dramatically
> restricts the API and forces an implementation of Map that is undesirable
> under some circumstances. Unfortunately there is no concept of OrderedMap in
> Java, just SortedMap.
> # Change SpecificData to compare maps based on contents (set equals=true when
> recursively comparing maps)
> # Change the visibility of
> SpecificData.compare(SpecificRecord,SpecificRecord,boolean) to public and
> change SpecificRecord.equals(Object) to compare only on equality rather than
> order.
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