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https://issues.apache.org/jira/browse/DERBY-6273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13691853#comment-13691853
]
Knut Anders Hatlen commented on DERBY-6273:
-------------------------------------------
The problem seems to be this loop in CoalesceFunctionNode.bindExpression():
//set all the parameter types to the type of the result type
for (int index = 0; index < argumentsListSize; index++)
{
if (((ValueNode)
argumentsList.elementAt(index)).requiresTypeFromContext())
{
((ValueNode)argumentsList.elementAt(index)).setType(getTypeServices());
break;
}
}
The comment says it should set *all* the parameter types, but the loop only
sets the type of the *first* parameter.
Removing the break statement from the loop seems to make the query compile
without throwing NPE.
> NullPointerException when using more than one parameter in COALESCE
> -------------------------------------------------------------------
>
> Key: DERBY-6273
> URL: https://issues.apache.org/jira/browse/DERBY-6273
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.10.1.1
> Reporter: Knut Anders Hatlen
>
> Calls to COALESCE fail with NullPointerExceptions if there are multiple ?
> parameters:
> ij version 10.10
> ij> connect 'jdbc:derby:memory:db;create=true';
> ij> prepare ps as 'values coalesce(?,?,1)';
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'. (errorCode =
> 0)
> java.lang.NullPointerException
> at
> org.apache.derby.impl.sql.compile.ParameterNode.generateExpression(Unknown
> Source)
> at
> org.apache.derby.impl.sql.compile.CoalesceFunctionNode.generateExpression(Unknown
> Source)
> at
> org.apache.derby.impl.sql.compile.ResultColumn.generateExpression(Unknown
> Source)
> at
> org.apache.derby.impl.sql.compile.ResultColumnList.generateCore(Unknown
> Source)
> at org.apache.derby.impl.sql.compile.ResultColumnList.generate(Unknown
> Source)
> at org.apache.derby.impl.sql.compile.RowResultSetNode.generate(Unknown
> Source)
> at
> org.apache.derby.impl.sql.compile.ScrollInsensitiveResultSetNode.generate(Unknown
> Source)
> at org.apache.derby.impl.sql.compile.CursorNode.generate(Unknown Source)
> at org.apache.derby.impl.sql.compile.StatementNode.generate(Unknown
> Source)
> at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
> at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
> at
> org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown
> Source)
> at org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
> Source)
> at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
> Source)
> at org.apache.derby.impl.tools.ij.ij.PrepareStatement(Unknown Source)
> at org.apache.derby.impl.tools.ij.ij.ijStatement(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)
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