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https://issues.apache.org/jira/browse/AVRO-3789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan Skraba resolved AVRO-3789.
-------------------------------
Resolution: Fixed
> Comparing maps in GenericData is wrong for certain combinations and fails for
> empty maps
> ----------------------------------------------------------------------------------------
>
> Key: AVRO-3789
> URL: https://issues.apache.org/jira/browse/AVRO-3789
> Project: Apache Avro
> Issue Type: Bug
> Components: java
> Affects Versions: 1.11.2
> Reporter: Felix Krull
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.11.3
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The rewritten map comparison implementation in GenericData (AVRO-2943
> according to the commit message) throws a NoSuchElementException when used to
> compare empty maps. Partial stacktrace:
> {code}
> Caused by: java.util.NoSuchElementException
> at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1513)
> at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1534)
> at
> org.apache.avro.generic.GenericData.compareMaps(GenericData.java:1163)
> at org.apache.avro.generic.GenericData.compare(GenericData.java:1250)
> at org.apache.avro.specific.SpecificData.compare(SpecificData.java:476)
> at org.apache.avro.generic.GenericData.compare(GenericData.java:1229)
> at org.apache.avro.specific.SpecificData.compare(SpecificData.java:476)
> at
> org.apache.avro.specific.SpecificRecordBase.equals(SpecificRecordBase.java:88)
> at scala.runtime.BoxesRunTime.equals2(BoxesRunTime.java:133)
> at scala.runtime.BoxesRunTime.equals(BoxesRunTime.java:119)
> at
> org.scalactic.DefaultEquality$.areEqualComparingArraysStructurally(DefaultEquality.scala:70)
> at org.scalactic.DefaultEquality.areEqual(DefaultEquality.scala:37)
> at org.mockito.package$$anon$2.areEqual(mockito.scala:614)
> at
> org.scalactic.TripleEqualsSupport$Equalizer.$eq$eq$eq(TripleEqualsSupport.scala:117)
> at org.mockito.matchers.EqTo.matches(EqTo.scala:11)
> ...
> {code}
>
> ----
> Also, the check in line 1170 that's intended to shortcircuit for maps of
> different sizes is incorrect. Because of this, maps will incorrectly compare
> equal when:
> * their sizes are different
> * one is a superset of the other map
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