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https://issues.apache.org/jira/browse/SOLR-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12561231#action_12561231
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Hoss Man commented on SOLR-464:
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Lance: I'm not understanding your description of this issue ... copyField has 
completely consistent behavior -- it always copies the source field to the dest 
field ... i just tested and had no problems copying a "date" field to a 
"string" field -- no failure, no silent failure.

as i mentioned in the mailing list: there are definite improvements that could 
be made to make it easier to convert input date strings to other date formats 
(including integers) but that's really an orthoginal issue to copyField.

do you have any specific examples of cases where copyField completley failed to 
work?

> <copyField> requests between dissimilar types should have consistent results
> ----------------------------------------------------------------------------
>
>                 Key: SOLR-464
>                 URL: https://issues.apache.org/jira/browse/SOLR-464
>             Project: Solr
>          Issue Type: Improvement
>          Components: search
>    Affects Versions: 1.3
>         Environment: Any Solr environment
>            Reporter: Lance Norskog
>            Priority: Minor
>
> The <copyField> directive works between certain dissimilar types, but does 
> not work among other types. The directive works between 'sint' and 'integer' 
> types.  However, copying a 'date' field to a 'String' field does not express 
> the date as a string. The directive also fails silently.
> The behaviour of <copyfield> between different types should be consistent. It 
> should either always fail, or always succeed. If the policy is that it should 
> fail in all cases, it should give an error on loading the schema, rather than 
> failing silently.

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