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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 Fri, 15 Feb 2013 08:59:13 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579042#comment-13579042

Knut Anders Hatlen commented on DERBY-3398:

Looks fine to me. It won't be fully consistent with the client driver until DERBY-5534 is
fixed, but now at least it should be possible to fix DERBY-5534 without adding knowledge about
the DB2 limits to the client driver.

Some small comments:

- The changes to DataDictionaryImpl look like leftovers from an earlier patch.

- Changes10_10 imports sun.print.PSStreamPrintService. It shouldn't.

- Changes10_10 uses SQLDataException. Will that work on older platforms (before JDBC 4.0)?

- It might be worth adding test cases for +/- Float.MIN_NORMAL and +/- Double.MIN_NORMAL.
Cannot use the constants directly, as they were added in Java 6, but the values could be tested.
Those would test that we're no longer limited by DB2_SMALLEST_POSITIVE_REAL, DB2_LARGEST_NEGATIVE_REAL,

- Nit: The two normalizeREAL() methods use different casing of "invalid". I prefer the lowercase

- Typo: Comment in NumberDataType.useDB2Limits() says "do no" instead of "do not".

- Changes10_10: The ResultSets produced in the first for loop aren't closed.

- Changes10_10: There are three PreparedStatements stored in fields. This technique has been
a frequent source of memory leaks in the tests, so it is best avoided if possible. In this
case, I think it will prevent the class loaders for the old engines to be garbage collected
after the test has completed. Setting the fields to null in tearDown() would help, but making
them local variables is probably less error-prone.
> 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:
>            Reporter: Knut Anders Hatlen
>            Assignee: Dag H. Wanvik
>            Priority: Minor
>              Labels: derby_triage10_10
>         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.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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