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  1. Derby
  2. DERBY-4698

Simple query with HAVING clause crashes with NullPointerException


    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s:,,,,,,,,
    • Fix Version/s:,,
    • Component/s: SQL
    • Labels:
    • Environment:
      Windows, Java 1.6
    • Bug behavior facts:
      Crash, Seen in production, Wrong query result


      Running a simple SQL query containing a having clause causes a NullPointerException. I originally encountered this in, but have also reproduces this in and the latest 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 I found that without the "where" clause is didn't crash but returned no results when it should have).

      SELECT u.user_id,
      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
      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
      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


        1. derby.zip
          615 kB
          Matt Doran
        2. derby-4698-1.diff
          6 kB
          Dag H. Wanvik
        3. derby-4698-1.stat
          0.4 kB
          Dag H. Wanvik
        4. derby-4698-2.diff
          11 kB
          Dag H. Wanvik
        5. derby-4698-2.stat
          0.5 kB
          Dag H. Wanvik
        6. derby-crash-
          3 kB
          Matt Doran
        7. derby-crash-
          3 kB
          Matt Doran
        8. derby-crash-
          3 kB
          Matt Doran

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              • Assignee:
                dagw Dag H. Wanvik
                matt_doran Matt Doran
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                • Created: