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https://issues.apache.org/jira/browse/DERBY-3033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12528179
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Bryan Pendleton commented on DERBY-3033:
----------------------------------------
I removed the mysterious "if" statement from BaseActivation.getColumnFromRow(),
and ran
all the regression tests. There were two failures, but I'm not sure if they
were due to this
change or not. I'll investigate them further. I did *not* get any
NullPointerException messages,
which is what I was sort of expecting to see.
So if removing the "if" statement from BaseActivation.java fixes this problem,
it apparently
isn't going to cause a whole lot of other problems.
I think the next step is to investigate whether removing the "if" statement
makes the repro script
pass.
> select query results in nullpointer exception in skipScan()
> -----------------------------------------------------------
>
> Key: DERBY-3033
> URL: https://issues.apache.org/jira/browse/DERBY-3033
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.2.2.0
> Environment: Windows XP, Java 5.0, JDBC, Derby 10.2.2.0
> Reporter: Haolan Qin
> Attachments: bug4736.sql, d3033-sane-ij-session-10.3.1.5.txt,
> query_plan.new, query_plan.old, test.rar, test.zip, viewer_10_1.zip
>
>
> The following error was repeatedly thrown when we tried to run a select query
> via JDBC. Strangely, the exact same select query did not trigger any error
> when run from the command line console. After we added an index, the error
> went away completely.
> java.lang.NullPointerException
> at org.apache.derby.impl.sql.execute.NoPutResultSetImpl.skipScan(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.TableScanResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.IndexRowToBaseRowResultSet.openCore(Unknown
> Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.JoinResultSet.openRight(Unknown Source)
> at org.apache.derby.impl.sql.execute.JoinResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.SortResultSet.openCore(Unknown Source)
> at
> org.apache.derby.impl.sql.execute.ProjectRestrictResultSet.openCore(Unknown
> Source)
> at org.apache.derby.impl.sql.execute.BasicNoPutResultSetImpl.open(Unknown
> Source)
> at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
> at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(Unknown Source)
> at
> org.apache.derby.impl.jdbc.EmbedPreparedStatement.executeStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement.execute(Unknown Source)
> at org.apache.derby.impl.drda.DRDAStatement.execute(Unknown Source)
> at org.apache.derby.impl.drda.DRDAConnThread.processCommands(Unknown Source)
> at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)
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