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https://issues.apache.org/jira/browse/DERBY-3398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13572452#comment-13572452
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Knut Anders Hatlen commented on DERBY-3398:
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Thanks, Dag. I think this is a useful improvement.
Some ideas for more tests:
- Use the extreme values in some additional contexts. For example in arithmetic
operations and as literals.
- What happens if a previously not allowed value is stored in a soft-upgraded
database and then later attempted read after downgrade?
- The patch has test cases for MIN_VALUE and MAX_VALUE. Should probably also
test for +/- MIN_NORMAL, which used to be out of range, but should be supported
now.
> 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
> Priority: Minor
> Labels: derby_triage10_10
> Attachments: derby-3398.diff, derby-3398.status
>
>
> 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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