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From "Chris Anderson (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (COUCHDB-617) Large integers being turned into floats
Date Tue, 09 Feb 2010 06:25:28 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-617?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Anderson reassigned COUCHDB-617:
--------------------------------------

    Assignee: Chris Anderson

> Large integers being turned into floats
> ---------------------------------------
>
>                 Key: COUCHDB-617
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-617
>             Project: CouchDB
>          Issue Type: Bug
>         Environment: 0.11.0b894112
> Ubuntu Karmic
> standard erlang 13.b.1 package
> xulrunner 1.9.1.6
>            Reporter: Brian Candler
>            Assignee: Chris Anderson
>         Attachments: couchdb-test-json.diff
>
>
> Somewhere between the view server and the client, large integer values are having .0
appended to make them look like floats.
> This is OK:
> $ curl -X POST -d '{"map":"function(doc) { emit(2000000000,null); }"}' http://127.0.0.1:5984/test_suite_db/_temp_view
> {"total_rows":3,"offset":0,"rows":[
> {"id":"bar","key":2000000000,"value":null},
> {"id":"baz","key":2000000000,"value":null},
> {"id":"foo","key":2000000000,"value":null}
> ]}
> But here's a large integer getting the .0 appended:
> $ curl -X POST -d '{"map":"function(doc) { emit(1262958680124,null); }"}' http://127.0.0.1:5984/test_suite_db/_temp_view
> {"total_rows":3,"offset":0,"rows":[
> {"id":"bar","key":1262958680124.0,"value":null},
> {"id":"baz","key":1262958680124.0,"value":null},
> {"id":"foo","key":1262958680124.0,"value":null}
> ]}
> And some values are getting turned into exponential format:
> $ curl -X POST -d '{"map":"function(doc) { emit(3000000000,null); }"}' http://127.0.0.1:5984/test_suite_db/_temp_view
> {"total_rows":3,"offset":0,"rows":[
> {"id":"bar","key":3.0e+9,"value":null},
> {"id":"baz","key":3.0e+9,"value":null},
> {"id":"foo","key":3.0e+9,"value":null}
> ]}
> It appears to affect integers larger than 2^31, but these are still much smaller than
the 2^48 mantissa of IEEE double precision (which Javascript uses). Hence they should be accurately
represented as integers, not floats.
> If I run the view server by itself from the command line, all works properly:
> $ bin/couchjs share/server/main.js 
> ["reset"]
> true
> ["add_fun","function(doc) { emit(1262958680124,null); }"]
> true
> ["add_fun","function(doc) { emit(3000000000,null); }"]
> true
> ["map_doc",{}]
> [[[1262958680124,null]], [[3000000000,null]]]
> Therefore it looks like the problem is in the Erlang JSON deserialisation side. i.e.
it's not keeping these values as large integers, when it could be.
> NOTE: I have another machine, running a similar recent couchdb trunk (0.11.0b894828)
plus Ubuntu Karmic Server Edition built against libmozjs 1.8.1.16 (not xulrunner). This exhibits
the same behaviour as above.
> But the problem *doesn't* appear on another, older CouchDB installation I have. This
is 0.11.0a813819 running under Ubuntu Hardy, with erlang 12.b.5 and libmozjs 1.8.1.18
> {"total_rows":1,"offset":0,"rows":[
> {"id":"person","key":3000000000,"value":null}
> ]}

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