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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4242) NPE or assert for query with duplicate predicates and duplicate aliasing
Date Fri, 03 Jul 2009 18:11:47 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dag H. Wanvik updated DERBY-4242:
---------------------------------

    Urgency: Normal

Triaged for 10.5.2,  "repro attached" and setting "normal" urgency.

> NPE or assert for query with duplicate predicates and duplicate aliasing
> ------------------------------------------------------------------------
>
>                 Key: DERBY-4242
>                 URL: https://issues.apache.org/jira/browse/DERBY-4242
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.6.0.0
>            Reporter: Kristian Waagan
>            Priority: Minor
>
> This case was reported by a user on derby-user: http://www.nabble.com/FEHLER-XJ001%3A-Java-Ausnahme%3A-%27%3A-java.lang.NullPointerException%27.-td23636203.html
> The original query and table definitions can be found in the mail from the user. I managed
to reduce it to the following query;
> -- Reproduces problem
> SELECT
>     POC_CNTNT.pln_ordr_id
> FROM
>     POC_CNTNT,
>     PLN_ORDR,
>     POC as poc1,
>     POC as poc12,
>     POC as poc121,
>     POC as poc2,
>     POC_STRUCT
> where
>      PLN_ORDR.pln_ordr_id = poc1.pln_ordr_id
>  and PLN_ORDR.pln_ordr_id = poc121.pln_ordr_id
>  and poc1.pln_ordr_id = POC_CNTNT.pln_ordr_id
>  and poc1.pln_ordr_id = POC_STRUCT.poc_struct_subj_pln_ordr_id
>  and poc121.pln_ordr_id = POC_STRUCT.poc_struct_obj_pln_ordr_id
>  and poc2.poc_ix = POC_CNTNT.poc_ix
>  and poc2.poc_ix = POC_CNTNT.poc_ix
> ;
> I think this cooks down to the following query, which runs without errors:
> SELECT
>     POC_CNTNT.pln_ordr_id
> FROM
>     POC_CNTNT,
>     PLN_ORDR,
>     POC,
>     POC_STRUCT
> where
>      PLN_ORDR.pln_ordr_id = POC.pln_ordr_id
>  and POC.pln_ordr_id = POC_CNTNT.pln_ordr_id
>  and POC.pln_ordr_id = POC_STRUCT.poc_struct_subj_pln_ordr_id
>  and POC.poc_ix = POC_CNTNT.poc_ix
> ;
> It is clear that the original query, and the reduced query reproducing the error, could
be improved significantly. What remains to investigate, is whether the error observed is indeed
a weakness in Derby's SQL handling, and if it can cause trouble for more general queries.
> At first sight, it looks to me like Derby gets confused because of duplicate aliases
and predicates. I don't know what the expected behavior for such queries is; fail (it is valid
SQL though, right?), create a warning, compile and perform badly, or compiled to a form where
duplicate/unnecessarily clauses are removed. 
> The stack trace with trunk (sane build) looks like this:
> ERROR XJ001: Java exception: 'ASSERT FAILED ColumnReference for correct column (columnPosition
= 1, exposed table name = APP.POC_STRUCT) not found on either side of BinaryRelationalOperator:
org.apache.derby.shared.common.sanity.AssertFailure'.
> java.sql.SQLException: Java exception: 'ASSERT FAILED ColumnReference for correct column
(columnPosition = 1, exposed table name = APP.POC_STRUCT) not found on either side of BinaryRelationalOperator:
org.apache.derby.shared.common.sanity.AssertFailure'.
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:95)
>         at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Util.java:87)
>         at org.apache.derby.impl.jdbc.Util.javaException(Util.java:244)
>         at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(TransactionResourceImpl.java:403)
>         at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(TransactionResourceImpl.java:346)
>         at org.apache.derby.impl.jdbc.EmbedConnection.handleException(EmbedConnection.java:2201)
>         at org.apache.derby.impl.jdbc.ConnectionChild.handleException(ConnectionChild.java:81)
>         at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:614)
>         at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:555)
>         at org.apache.derby.impl.tools.ij.ij.executeImmediate(ij.java:329)
>         at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:505)
>         at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:347)
>         at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:245)
>         at org.apache.derby.impl.tools.ij.Main.go(Main.java:210)
>         at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:177)
>         at org.apache.derby.impl.tools.ij.Main.main(Main.java:73)
>         at org.apache.derby.tools.ij.main(ij.java:59)
> Caused by: java.sql.SQLException: Java exception: 'ASSERT FAILED ColumnReference for
correct column (columnPosition = 1, exposed table name = APP.POC_STRUCT) not found on either
side of BinaryRelationalOperator: org.apache.derby.shared.common.sanity.AssertFailure'.
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(SQLExceptionFactory40.java:119)
>         at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
>         ... 16 more
> Caused by: org.apache.derby.shared.common.sanity.AssertFailure: ASSERT FAILED ColumnReference
for correct column (columnPosition = 1, exposed table name = APP.POC_STRUCT) not found on
either side of BinaryRelationalOperator
>         at org.apache.derby.shared.common.sanity.SanityManager.THROWASSERT(SanityManager.java:162)
>         at org.apache.derby.shared.common.sanity.SanityManager.THROWASSERT(SanityManager.java:147)
>         at org.apache.derby.impl.sql.compile.BinaryRelationalOperatorNode.generateExpressionOperand(BinaryRelationalOperatorNode.java:488)
>         at org.apache.derby.impl.sql.compile.Predicate.generateExpressionOperand(Predicate.java:670)
>         at org.apache.derby.impl.sql.compile.PredicateList.generateSetColumn(PredicateList.java:3544)
>         at org.apache.derby.impl.sql.compile.PredicateList.generateStartKey(PredicateList.java:3368)
>         at org.apache.derby.impl.sql.compile.BaseJoinStrategy.fillInScanArgs1(BaseJoinStrategy.java:109)
>         at org.apache.derby.impl.sql.compile.NestedLoopJoinStrategy.getScanArgs(NestedLoopJoinStrategy.java:248)
>         at org.apache.derby.impl.sql.compile.FromBaseTable.getScanArguments(FromBaseTable.java:3449)
>         at org.apache.derby.impl.sql.compile.FromBaseTable.generateResultSet(FromBaseTable.java:3139)
>         at org.apache.derby.impl.sql.compile.FromBaseTable.generate(FromBaseTable.java:3066)
>         at org.apache.derby.impl.sql.compile.ProjectRestrictNode.generateMinion(ProjectRestrictNode.java:1477)
>         at org.apache.derby.impl.sql.compile.ProjectRestrictNode.generate(ProjectRestrictNode.java:1341)
>         at org.apache.derby.impl.sql.compile.JoinNode.getJoinArguments(JoinNode.java:1579)
>         at org.apache.derby.impl.sql.compile.JoinNode.generateCore(JoinNode.java:1555)
>         at org.apache.derby.impl.sql.compile.JoinNode.generate(JoinNode.java:1479)
>         at org.apache.derby.impl.sql.compile.ProjectRestrictNode.generateMinion(ProjectRestrictNode.java:1477)
>         at org.apache.derby.impl.sql.compile.ProjectRestrictNode.generate(ProjectRestrictNode.java:1341)
>         at org.apache.derby.impl.sql.compile.ScrollInsensitiveResultSetNode.generate(ScrollInsensitiveResultSetNode.java:109)
>         at org.apache.derby.impl.sql.compile.CursorNode.generate(CursorNode.java:606)
>         at org.apache.derby.impl.sql.compile.StatementNode.generate(StatementNode.java:347)
>         at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:449)
>         at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:88)
>         at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:822)
>         at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:606)
>         ... 9 more

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