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https://issues.apache.org/jira/browse/DERBY-3097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12908130#action_12908130
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Dag H. Wanvik commented on DERBY-3097:
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It appears that the removed code in BaseActivation resulted in a regression, cf
DERBY-4798.
> Unnecessary if statement can be removed from BaseActivation.getColumnFromNow
> ----------------------------------------------------------------------------
>
> Key: DERBY-3097
> URL: https://issues.apache.org/jira/browse/DERBY-3097
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.4.1.3
> Reporter: Bryan Pendleton
> Assignee: Bryan Pendleton
> Priority: Minor
> Fix For: 10.5.1.1
>
> Attachments: checkNumOpens.diff, updatedJune2008.diff
>
>
> In BaseActivation.java there is the following code:
> protected final DataValueDescriptor getColumnFromRow(int rsNumber, int colId)
> throws StandardException {
> if( row[rsNumber] == null)
> {
> /* This actually happens. NoPutResultSetImpl.clearOrderableCache
> attempts to prefetch invariant values
> * into a cache. This fails in some deeply nested joins. See
> Beetle 4736 and 4880.
> */
> return null;
> }
> return row[rsNumber].getColumn(colId);
> }
> During the investigation of DERBY-3033, I came to the conclusion that this
> "if" statement is no longer necessary, and in fact is counter-productive, for
> it makes diagnosing other problems harder by delaying the point at which data
> structure problems are exposed as errors in the code.
> This JIRA issue requests that this code be evaluated, to determine whether or
> not it truly is necessary, and, if it is not necessary, suggests that it
> should be removed, to result in simpler, clearer code.
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