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https://issues.apache.org/jira/browse/SOLR-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12561203#action_12561203
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Lance Norskog commented on SOLR-464:
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Certain type pairs require configuration control parameters.
The most complex example is converting a Date to an integer for sorting
purposes. Dates are 64 bits. To get a usable sorting value requires
subtracting a base date, earlier than any date used in the index. This gives a
relative number that fits inside 32 bits and sorts correctly.
> <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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