[DERBY-6703] MERGE statement fails with NullPointerException if ON clause references non-existent column

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 10.11.1.1
• Fix Version/s: 10.11.1.3, 10.12.1.1
• Component/s: SQL
• Issue & fix info: Repro attached
• Assignee: Knut Anders Hatlen
• Reporter: Knut Anders Hatlen
• Created: 13/Aug/14 08:39
• Updated: 20/Aug/14 08:32
• Resolved: 20/Aug/14 08:32

Description

ij> create table t1(x int);
0 rows inserted/updated/deleted
ij> create table t2(y int);
0 rows inserted/updated/deleted
ij> merge into t1 using t2 on z when matched then update set x=x+1;
ERROR XJ001: Java exception: ': java.lang.NullPointerException'.

Stack trace with line numbers on trunk:

java.lang.NullPointerException
	at org.apache.derby.impl.sql.compile.MergeNode.addColumn(MergeNode.java:947)
	at org.apache.derby.impl.sql.compile.MergeNode.getColumnsFromList(MergeNode.java:930)
	at org.apache.derby.impl.sql.compile.MergeNode.getColumnsInExpression(MergeNode.java:314)
	at org.apache.derby.impl.sql.compile.MergeNode.buildSelectList(MergeNode.java:816)
	at org.apache.derby.impl.sql.compile.MergeNode.bindLeftJoin(MergeNode.java:579)
	at org.apache.derby.impl.sql.compile.MergeNode.bindStatement(MergeNode.java:396)
	at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:401)
	at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:99)
	at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:1114)
	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:683)
	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:631)
	at org.apache.derby.impl.tools.ij.ij.executeImmediate(ij.java:367)
	at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:529)
	at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:371)
	at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:247)
	at org.apache.derby.impl.tools.ij.Main.go(Main.java:229)
	at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:184)
	at org.apache.derby.impl.tools.ij.Main.main(Main.java:75)
	at org.apache.derby.tools.ij.main(ij.java:59)
	at org.apache.derby.iapi.tools.run.main(run.java:53)