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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-3398) Support min/max values for Java types float/double in real/double columns
Date Wed, 20 Feb 2013 16:17:13 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13582280#comment-13582280
] 

Knut Anders Hatlen commented on DERBY-3398:
-------------------------------------------

Hi Kim,

Yes, those limits need to be updated. New values are:

Smallest DOUBLE: 4.9e-324 (aka Double.MIN_VALUE)
Largest DOUBLE: 1.7976931348623157e+308 (aka Double.MAX_VALUE)
Smallest positive DOUBLE: 2.2250738585072014E-308 (aka Double.MIN_NORMAL)
Largest negative DOUBLE: -2.2250738585072014E-308
Smallest REAL: 1.4e-45 (aka Float.MIN_VALUE)
Largest REAL: 3.4028235e+38 (aka Float.MAX_VALUE)
Smallest positive REAL: 1.17549435E-38 (aka Float.MIN_NORMAL)
Largest negative REAL: -1.17549435E-38
                
> Support min/max values for Java types float/double in real/double columns
> -------------------------------------------------------------------------
>
>                 Key: DERBY-3398
>                 URL: https://issues.apache.org/jira/browse/DERBY-3398
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.4.1.3
>            Reporter: Knut Anders Hatlen
>            Assignee: Dag H. Wanvik
>            Priority: Minor
>              Labels: derby_triage10_10
>             Fix For: 10.10.0.0
>
>         Attachments: derby-3398-2.diff, derby-3398-3.diff, derby-3398-3.stat, derby-3398-4.diff,
derby-3398-5.diff, derby-3398-5.stat, derby-3398-7.diff, derby-3398-7.stat, derby-3398-8.diff,
derby-3398.diff, derby-3398.status, releaseNote.html, releaseNote.html
>
>
> Derby doesn't support the entire range of valid (finite) values of the Java primitive
types double/float in columns with SQL type DOUBLE or REAL. This appears to be a limitation
that was introduced for compatibility with DB2. There have been some requests on derby-user
that we lift this restriction.
> The restriction is enforced by the methods normalizeREAL() and normalizeDOUBLE() in org.apache.derby.iapi.types.NumberDataType.

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