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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5554) NullPointerException in generated VTI code
Date Fri, 18 May 2012 19:03:11 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279085#comment-13279085
] 

Rick Hillegas commented on DERBY-5554:
--------------------------------------

The failing query looks very similar to the sample query for SYSCS_DIAG.SPACE_TABLE found
in the Reference Manual section titled "SYSCS_DIAG diagnostic tables and functions":

SELECT T2.*
    FROM 
        SYS.SYSTABLES systabs,
        TABLE (SYSCS_DIAG.SPACE_TABLE(systabs.tablename)) AS T2
    WHERE systabs.tabletype = 'T'

I confess that I don't understand the meaning of either query. When we implemented user-defined
table functions, we specified that the arguments to the table function should be expressions
built from the following:

1) literals
2) ? parameters
3) correlated references to variables in outer query blocks

That is, the arguments were supposed to be constant within the query block. We specifically
did not want table function arguments to be variables from other tables in the FROM list.
However, we don't enforce this limitation. You get a similar NPE if you replace the SYSCS_DIAG.SPACE_TABLE
element in the FROM list with an invocation of a user defined table function which takes the
SYSTABLES.TABLENAME variable as an argument.

I'm trying to figure out what these queries mean. My usual approach to understanding a query
is to follow these steps:

A) Compute the cartesian product of the elements in the FROM list.

B) Then join and restrict by applying the WHERE clause to the cartesian product.

C) Then apply the other clauses in an order which doesn't affect this discussion.

With these queries, what is (A)? I don't see a cartesian product here because there is an
implicit, undefined join in the FROM list.

My gut feeling is that these may be illegal queries, but I haven't found the relevant chapter
and verse in the SQL Standard. I would be interested in other people's theories about the
meaning of these queries and how you thread your way through the SQL Standard in order to
determine that meaning.

Thanks,
-Rick

                
> NullPointerException in generated VTI code
> ------------------------------------------
>
>                 Key: DERBY-5554
>                 URL: https://issues.apache.org/jira/browse/DERBY-5554
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.3.1.4, 10.4.1.3, 10.5.1.1, 10.6.1.0, 10.7.1.1, 10.8.2.2
>            Reporter: Bryan Pendleton
>              Labels: derby_triage10_9
>
> With the latest 10.8.2.2 binary distribution, the following short script produces a NullPointerException:
> java -Dij.exceptionTrace=true org.apache.derby.tools.ij
> ij> connect 'jdbc:derby:brydb;create=true';
> ij> create table t1 (a int);
> ij> SELECT T2.*, systabs.*, syscgs.conglomeratenumber
>     FROM 
>         SYS.SYSTABLES systabs, sys.sysconglomerates syscgs,
>         TABLE (SYSCS_DIAG.SPACE_TABLE(systabs.tablename)) AS T2
>     WHERE systabs.tabletype = 'T' and systabs.tableid = syscgs.tableid;
> The exception trace is pasted below:
> ERROR 38000: The exception 'java.lang.NullPointerException' was thrown while evaluating
an expression.
> java.sql.SQLException: The exception 'java.lang.NullPointerException' was thrown while
evaluating an expression.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.seeNextException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(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)
> Caused by: java.sql.SQLException: The exception 'java.lang.NullPointerException' was
thrown while evaluating an expression.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown
Source)
> 	... 18 more
> Caused by: java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown
Source)
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
> 	... 15 more
> Caused by: java.lang.NullPointerException
> 	at org.apache.derby.exe.acf81e0010x0134x6972x0511x0000033820000.g0(Unknown Source)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:616)
> 	at org.apache.derby.impl.services.reflect.ReflectMethod.invoke(Unknown Source)
> 	at org.apache.derby.impl.sql.execute.VTIResultSet.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.JoinResultSet.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.executeStmt(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
> 	... 11 more
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.getSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.Util.javaException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.wrapInSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.TransactionResourceImpl.handleException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedConnection.handleException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.ConnectionChild.handleException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.EmbedStatement.executeStatement(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)
> Caused by: java.sql.SQLException: Java exception: ': java.lang.NullPointerException'.
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory.getSQLException(Unknown Source)
> 	at org.apache.derby.impl.jdbc.SQLExceptionFactory40.wrapArgsForTransportAcrossDRDA(Unknown
Source)
> 	... 19 more
> Caused by: java.lang.NullPointerException
> 	at org.apache.derby.exe.acf81e0010x0134x6972x0511x0000033820000.g0(Unknown Source)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:616)
> 	at org.apache.derby.impl.services.reflect.ReflectMethod.invoke(Unknown Source)
> 	at org.apache.derby.impl.sql.execute.VTIResultSet.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.JoinResultSet.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.executeStmt(Unknown Source)
> 	at org.apache.derby.impl.sql.GenericPreparedStatement.execute(Unknown Source)
> 	... 11 more

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