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https://issues.apache.org/jira/browse/CAY-2660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17128465#comment-17128465
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Matt Watson commented on CAY-2660:
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Nice fix. Been needing this for a while.
> BigDecimals that differ only in scale are treated as different values causing
> unneeded updates
> ----------------------------------------------------------------------------------------------
>
> Key: CAY-2660
> URL: https://issues.apache.org/jira/browse/CAY-2660
> Project: Cayenne
> Issue Type: Bug
> Affects Versions: 4.0.2, 4.1.RC2, 4.2.M1
> Reporter: Andrus Adamchik
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Given a column mapping of "DECIMAL(N, M)" to Java BigDecimal, the following
> code causes an update where it shouldn't (as there are no changes) :
> {noformat}
> // assuming the column is "DECIMAL(12, 6)"
> BigDecimal bd = new BigDecimal("7890.1");
> // save object
> o.setValue(bd);
> o.getObjectContext().commitChanges();
> // refetch object - the result will be padded to DB scale - "7890.100000"
> BigDecimalEntity o2 =
> ObjectSelect.query(BigDecimalEntity.class).selectFirst(runtime.newContext());
> // set to the same value and commit
> o2.setValue(bd);
> // *** PROBLEM HERE - "UPDATE" SQL is generated, while logically it should
> have been a noop
> o2.getObjectContext().commitChanges();
> {noformat}
> [I have a PR|https://github.com/apache/cayenne/pull/426] with a fix based on
> using "compareTo" instead of "equals" for BigDecimals, but it will require
> some discussion...
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