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https://issues.apache.org/jira/browse/ARROW-1184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16073992#comment-16073992
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Bryan Cutler commented on ARROW-1184:
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I think that comparing any 2 FieldVectors could get pretty complicated,
especially with nested types, so maybe that's why FieldVector.equals() is not
implemented. Validator.java has a comparison but I think that would probably
fail for some cases. I'm not sure we can assume flat fields only for the
dictionary vector to try to make it easier.
> [Java] Dictionary.equals is not working correctly
> -------------------------------------------------
>
> Key: ARROW-1184
> URL: https://issues.apache.org/jira/browse/ARROW-1184
> Project: Apache Arrow
> Issue Type: Bug
> Components: Java - Vectors
> Reporter: Bryan Cutler
>
> The {{Dictionary.equals}} method does not return True when the dictionaries
> are equal. This is because {{equals}} is not implemented for FieldVector and
> so that comparison defaults to comparing the two objects only and not the
> vector data.
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