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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4148) _TestUtil should be able to generate random longs
Date Fri, 15 Jun 2012 16:59:42 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295765#comment-13295765
] 

Dawid Weiss commented on LUCENE-4148:
-------------------------------------

@Robert: sure we could (noting the subtle difference that the range is inclusive on both min
and max).

As for distribution... I think it should be uniform over all of the range's values assuming
r.nextDouble() yields uniform value from [0,1]? It's simple scaling after all. I didn't really
consider nuances of floating point representation here but I think within 2^32 a double should
cover everything fairly well. 
                
> _TestUtil should be able to generate random longs
> -------------------------------------------------
>
>                 Key: LUCENE-4148
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4148
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: general/test
>            Reporter: Adrien Grand
>            Priority: Trivial
>
> It would be helpful in TestPackedInts at least, in order to generate random values (as
a workaround, we currently generate a random int between 0 and {{min(Integer.MAX_VALUE, PackedInts.maxValue(bitsPerValue)}}).
Moreover, it would help to fix {{nextInt}} for large ranges (calling {{nextInt(random, -10,
Integer.MAX_VALUE)}} or even {{nextInt(random, 0, Integer.MAX_VALUE)}} currently fails because
the range of values is {{> Integer.MAX_VALUE}}.

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