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https://issues.apache.org/jira/browse/LUCY-138?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marvin Humphrey resolved LUCY-138.
----------------------------------

    Resolution: Fixed

Committed as r1085159.

> FieldType Equals() should return false when class doesn't match
> ---------------------------------------------------------------
>
>                 Key: LUCY-138
>                 URL: https://issues.apache.org/jira/browse/LUCY-138
>             Project: Lucy
>          Issue Type: Bug
>          Components: Plan
>            Reporter: Marvin Humphrey
>            Assignee: Marvin Humphrey
>             Fix For: 0.1-incubating
>
>         Attachments: ftype_equals.patch
>
>
> FieldType's Equals() method, which contains shared routines invoked by
> subclass Equals() methods, does not check whether "self" and "other" belong to
> the same class.  This can lead to index corruption if a field definition goes
> undetected because only the class changed while all instance variables 
> remained
> the same.
> Dev list discussion: [http://s.apache.org/FRn]

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