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https://issues.apache.org/jira/browse/DERBY-3033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12531070
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Bryan Pendleton commented on DERBY-3033:
----------------------------------------
I've persuaded myself that Army's repro3 is reproducing the same basic problem,
and so I'm going to move forward with building a complete patch using repro3
as the core regression test.
I'm considering adding the new regression test to ExistsWithSetOpsTest.java,
which isn't a perfect location, but I was looking for an existing JUnit test
that
covered much of the same areas of the code, and that one seemed not too
implausible. Is there a better location for the new test? Specifically, are
there
existing JUnit tests that specifically cover subquery flattening?
I'm also intending to open a separate JIRA to continue the investigation of
the mystery "if" statement in BaseActivation.getColumnFromRow. It is my
belief that that "if" statement can (and should) be removed.
> 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
> Assignee: Bryan Pendleton
> Attachments: bug4736.sql, d3033-sane-ij-session-10.3.1.5.txt,
> generatedActivation.txt, noClosureOfNotExists.diff, query_plan.new,
> query_plan.old, queryPlanRS.txt, repro2.java, repro2.java, repro3.java,
> 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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