[DERBY-4698] Simple query with HAVING clause crashes with NullPointerException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0, 10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0
• Fix Version/s: 10.5.3.1, 10.6.2.1, 10.7.1.1
• Component/s: SQL
• Environment: Windows, Java 1.6
• Bug behavior facts: Crash, Seen in production, Wrong query result
• Assignee: Dag H. Wanvik
• Reporter: Matt Doran
• Created: 14/Jun/10 05:12
• Updated: 17/Jun/13 09:19
• Resolved: 05/Jul/10 12:49

Description

Running a simple SQL query containing a having clause causes a NullPointerException. I originally encountered this in 10.4.2.0, but have also reproduces this in 10.5.3.0 and the latest 10.6.1.0. I raised this on the mailing list too, and Knut said it also fails on trunk - see http://thread.gmane.org/gmane.comp.apache.db.derby.user/12782

The query (created throw Hibernate) that causes the crash is:

SELECT user0_.user_id AS col_0_0_,
SUM(account2_.balance) AS col_1_0_
FROM tbl_user user0_
INNER JOIN tbl_user_account accountlin1_
ON user0_.user_id = accountlin1_.user_id
INNER JOIN tbl_account account2_
ON accountlin1_.account_id = account2_.account_id
WHERE user0_.deleted = 'N'
AND ( account2_.account_type IN ( 'USER-01', 'USER' ) )
GROUP BY user0_.user_id
HAVING SUM(account2_.balance) >= 100.0

However I simplified it to the following and still caused a crash (though in 10.4.2.0 I found that without the "where" clause is didn't crash but returned no results when it should have).

SELECT u.user_id,
SUM(a.balance)
FROM tbl_user u
INNER JOIN tbl_user_account al
ON u.user_id = al.user_id
INNER JOIN tbl_account a
ON al.account_id = a.account_id
GROUP BY u.user_id
HAVING sum(a.balance) >= 10.0

The derby log showed the following stace trace for 10.6.1.0:
2010-06-14 04:59:24.942 GMT Thread[main,5,main] (XID = 5824013), (SESSIONID = 1), (DATABASE = C:\Development\pc-ng-branch\server\working\data\internal/derby), (DRDAID = null), Failed Statement is: SELECT u.user_id user_id,
SUM(a.balance) acct_sum
FROM tbl_user u
INNER JOIN tbl_user_account al
ON u.user_id = al.user_id
INNER JOIN tbl_account a
ON al.account_id = a.account_id
GROUP BY u.user_id
HAVING sum(a.balance) >= 1.0
java.lang.NullPointerException
at org.apache.derby.impl.sql.compile.ColumnReference.remapColumnReferencesToExpressions(Unknown Source)
at org.apache.derby.impl.sql.compile.AggregateNode.getNewExpressionResultColumn(Unknown Source)
at org.apache.derby.impl.sql.compile.GroupByNode.addAggregateColumns(Unknown Source)
at org.apache.derby.impl.sql.compile.GroupByNode.addNewColumnsForAggregation(Unknown Source)
at org.apache.derby.impl.sql.compile.GroupByNode.addAggregates(Unknown Source)
at org.apache.derby.impl.sql.compile.GroupByNode.init(Unknown Source)
at org.apache.derby.iapi.sql.compile.NodeFactory.getNode(Unknown Source)
at org.apache.derby.impl.sql.compile.SelectNode.genProjectRestrict(Unknown Source)
at org.apache.derby.impl.sql.compile.SelectNode.modifyAccessPaths(Unknown Source)
at org.apache.derby.impl.sql.compile.DMLStatementNode.optimizeStatement(Unknown Source)
at org.apache.derby.impl.sql.compile.CursorNode.optimizeStatement(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
at org.apache.derby.impl.jdbc.EmbedStatement.execute(Unknown Source)
at org.apache.derby.impl.tools.ij.ij.executeImmediate(Unknown Source)
at org.apache.derby.impl.tools.ij.utilMain.doCatch(Unknown Source)
at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(Unknown Source)
at org.apache.derby.impl.tools.ij.utilMain.go(Unknown Source)
at org.apache.derby.impl.tools.ij.Main.go(Unknown Source)
at org.apache.derby.impl.tools.ij.Main.mainCore(Unknown Source)
at org.apache.derby.impl.tools.ij.Main.main(Unknown Source)
at org.apache.derby.tools.ij.main(Unknown Source)
Cleanup action completed

Issue Links

• is duplicated by: DERBY-4954 Crash with NullPointerException on SELECT query
• is related to: DERBY-3880 NPE on a query with having clause involving a join
• is required by: DERBY-4728 10.5 backport effort tracking issue