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Posted to derby-dev@db.apache.org by "Fanweifeng (Jira)" <ji...@apache.org> on 2021/12/15 10:10:00 UTC
[jira] [Commented] (DERBY-4041) NullPointerException on query with misplaced DERBY-PROPERTIES clause
[ https://issues.apache.org/jira/browse/DERBY-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17459799#comment-17459799 ]
Fanweifeng commented on DERBY-4041:
-----------------------------------
The reason of NPE is caused by CostEstimate is null when invoke optimizableList.getOptimizable(bestJoinOrder[i]).getTrulyTheBestAccessPath().getCostEstimate().
This problem can be fixed referred to add ( ce ==null ) continue like code in line 912.
for (int i = 0; i < numOptimizables; i++)
{
firstLookOrder[i] = i;
CostEstimate ce = optimizableList.getOptimizable(i).
getBestAccessPath().getCostEstimate();
if (ce == null)
{
permuteState = READY_TO_JUMP; //come again?
break;
}
rc[i] = ce.singleScanRowCount();
}
> NullPointerException on query with misplaced DERBY-PROPERTIES clause
> --------------------------------------------------------------------
>
> Key: DERBY-4041
> URL: https://issues.apache.org/jira/browse/DERBY-4041
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.3.3.0, 10.4.2.0, 10.5.1.1
> Reporter: Katherine Marsden
> Assignee: Dimuthu Wickramanayake
> Priority: Minor
> Labels: derby_triage10_8
> Attachments: AttributeHolder.patch, commentedQueryRepro.out, commentedQueryRepro.sql, modified_querynperepro.sql, querynperepro.sql
>
>
> The following sql throws a NullPointerException
> ij> CREATE TABLE "APP"."T1" ("I" INTEGER, "J" INTEGER);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values (1, 2), (2, 4), (3, 6), (4, 8), (5, 10);
> 5 rows inserted/updated/deleted
> ij> CREATE TABLE "APP"."T2" ("I" INTEGER, "J" INTEGER);
> 0 rows inserted/updated/deleted
> ij> insert into t2 values (1, 2), (2, -4), (3, 6), (4, -8), (5, 10);
> 5 rows inserted/updated/deleted
> ij> CREATE TABLE "APP"."T3" ("A" INTEGER, "B" INTEGER);
> 0 rows inserted/updated/deleted
> ij> insert into T3 values (1,1), (2,2), (3,3), (4,4), (6, 24),
> (7, 28), (8, 32), (9, 36), (10, 40);
> 9 rows inserted/updated/deleted
> ij> insert into t3 (a) values 11, 12, 13, 14, 15, 16, 17, 18, 19, 20;
> 10 rows inserted/updated/deleted
> ij> update t3 set b = 2 * a where a > 10;
> 10 rows inserted/updated/deleted
> ij> CREATE TABLE "APP"."T4" ("A" INTEGER, "B" INTEGER);
> 0 rows inserted/updated/deleted
> ij> insert into t4 values (3, 12), (4, 16);
> 2 rows inserted/updated/deleted
> ij> insert into t4 (a) values 11, 12, 13, 14, 15, 16, 17, 18, 19, 20;
> 10 rows inserted/updated/deleted
> ij> update t4 set b = 2 * a where a > 10;
> 10 rows inserted/updated/deleted
> ij> select count(*) from (select * from t1 union select * from t3 --DERBY-PROPERTIES joinStrategy=HASH
> ) x1 (c, d), (select * from t2 union select * from t4) x2 (e, f) where x1.c = x2.e ;
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
> 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: ': java.lang.NullPointerException'.
> at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(SQLExceptionFactory.java:45)
> at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(SQLExceptionFactory40.java:11
> 9)
> at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(SQLExceptionFactory40.java:70)
> ... 16 more
> Caused by: java.lang.NullPointerException
> at org.apache.derby.impl.sql.compile.OptimizerImpl.getFinalCost(OptimizerImpl.java:2498)
> at org.apache.derby.impl.sql.compile.SelectNode.getFinalCostEstimate(SelectNode.java:1987)
> at org.apache.derby.impl.sql.compile.UnionNode.getFinalCostEstimate(UnionNode.java:653)
> at org.apache.derby.impl.sql.compile.SetOperatorNode.modifyAccessPath(SetOperatorNode.java:169)
> at org.apache.derby.impl.sql.compile.ProjectRestrictNode.modifyAccessPath(ProjectRestrictNode.java:718)
> at org.apache.derby.impl.sql.compile.OptimizerImpl.modifyAccessPaths(OptimizerImpl.java:2456)
> at org.apache.derby.impl.sql.compile.SelectNode.modifyAccessPaths(SelectNode.java:1865)
> at org.apache.derby.impl.sql.compile.DMLStatementNode.optimizeStatement(DMLStatementNode.java:307)
> at org.apache.derby.impl.sql.compile.CursorNode.optimizeStatement(CursorNode.java:515)
> at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:367)
> at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:88)
> at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConne
> ctionContext.java:802)
> at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:606)
> ... 9 more
> I think the directive is misplaced and should come after the x1 (c, d) but it shouldn't throw an NPE
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