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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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