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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4425) NullPointerException with INSERT INTO ... from UNION and columns generated from expressions
Date Mon, 26 Oct 2009 09:55:59 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769963#action_12769963
] 

Knut Anders Hatlen commented on DERBY-4425:
-------------------------------------------

java.lang.NullPointerException
        at org.apache.derby.iapi.types.DataTypeDescriptor.isExactTypeAndLengthMatch(DataTypeDescriptor.java:954)
        at org.apache.derby.impl.sql.compile.ResultColumn.columnTypeAndLengthMatch(ResultColumn.java:1020)
        at org.apache.derby.impl.sql.compile.ResultColumnList.columnTypesAndLengthsMatch(ResultColumnList.java:1696)
        at org.apache.derby.impl.sql.compile.ResultSetNode.columnTypesAndLengthsMatch(ResultSetNode.java:934)
        at org.apache.derby.impl.sql.compile.UnionNode.addNewNodes(UnionNode.java:411)
        at org.apache.derby.impl.sql.compile.UnionNode.modifyAccessPaths(UnionNode.java:361)
        at org.apache.derby.impl.sql.compile.DMLStatementNode.optimizeStatement(DMLStatementNode.java:323)
        at org.apache.derby.impl.sql.compile.DMLStatementNode.optimizeStatement(DMLStatementNode.java:302)
        at org.apache.derby.impl.sql.compile.DMLModStatementNode.optimizeStatement(DMLModStatementNode.java:1736)
        at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:381)
        at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:90)
        at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:828)
        at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:606)
        at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:555)

> NullPointerException with INSERT INTO ... from UNION and columns generated from expressions
> -------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4425
>                 URL: https://issues.apache.org/jira/browse/DERBY-4425
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.5.1.1, 10.5.3.0, 10.6.0.0
>            Reporter: Knut Anders Hatlen
>
> This bug is similar to DERBY-4419, only that it uses columns that are auto-generated
from expressions and not identity columns. The proposed fix for DERBY-4419 only addresses
the case with an identity column.
> ij> create table t1(x int);
> 0 rows inserted/updated/deleted
> ij> create table t2(x int);
> 0 rows inserted/updated/deleted
> ij> create table t3(x int, y generated always as (2*x));
> 0 rows inserted/updated/deleted
> ij> insert into t3(x) select * from t1 union select * from t2;
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.

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