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https://issues.apache.org/jira/browse/LUCENE-2154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831646#action_12831646
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Michael McCandless commented on LUCENE-2154:
--------------------------------------------

What if we require that all segments are the same codec, if you want to use 
attributes from a Multi*Enum?  (I think this limitation is fine... and if it's 
not, one could still operate per-segment with different attr impls per segment).

This way, every segment would share the same attr impl for a given attr 
interface?

And then couldn't we somehow force each segment to use the same attr impl as 
the last segment(s)?

> Need a clean way for Dir/MultiReader to "merge" the AttributeSources of the 
> sub-readers
> ---------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2154
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2154
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: Flex Branch
>            Reporter: Michael McCandless
>             Fix For: Flex Branch
>
>
> The flex API allows extensibility at the Fields/Terms/Docs/PositionsEnum 
> levels, for a codec to set custom attrs.
> But, it's currently broken for Dir/MultiReader, which must somehow share 
> attrs across all the sub-readers.  Somehow we must make a single attr source, 
> and tell each sub-reader's enum to use that instead of creating its own.  
> Hopefully Uwe can work some magic here :)

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