[#DERBY-488] DatabaseMetaData.getColumns() fails on iSeries JDK 1.4 with verfier error on generated class.

Derby

DatabaseMetaData.getColumns() fails on iSeries JDK 1.4 with verfier error on generated class.

Created: 04/Aug/05 05:24 AM Updated: 30/Sep/05 02:27 AM

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Component/s:

SQL

Affects Version/s:

10.1.1.0

Fix Version/s:

10.0.2.2, 10.1.2.1, 10.2.1.6

Time Tracking:

Not Specified

File Attachments:

	File Name	Date Attached	Attached By	Size
	patch488.txt	2005-08-04 05:26 AM	Daniel John Debrunner	0.6 kB

Resolution Date:

30/Sep/05 02:27 AM

Description

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Analysis shows that
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The problem is occurring starting at offset 2007 in method e23. There is an invokeinterface to method setWidth(int, int, boolean) of class VariableSizeDataValue. This invoke returns a value of class DataValueDescriptor. That value is in turn stored in field e142 at offset 2015 in method e23. The problem is that field e142 is a NumberDataValue, and DataValueDescriptor is not a valid subclass of NumberDataValue. Thus the store is not allowed.
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Looking at the generated setWidth() calls I see one in BinaryOperatorNode where the return (DataValueDescriptor) is not cast to the type of the field it is stored in.

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Repository	Revision	Date	User	Message
ASF	#227406	Thu Aug 04 14:20:25 UTC 2005	djd	~~DERBY-488~~ Cast the return (DataValueDescriptor) from a generated call to setWidth to the type of the field it was being stored in (sub-class of DataValueDescriptor, e.g. NumberDataValue). The previous incorrect assignment worked and passed most verifiers but the 1.4.2 VM on IBM iSeries rejected the generated class.
				Files Changed
				MODIFY /db/derby/code/branches/10.1/java/engine/org/apache/derby/impl/sql/compile/BinaryOperatorNode.java

Repository	Revision	Date	User	Message
ASF	#227518	Thu Aug 04 23:44:02 UTC 2005	djd	~~DERBY-488~~ Merge fix 227406 from 10.1 branch. Cast return from generated setWidth call to type of field it will be stored in.
				Files Changed
				MODIFY /db/derby/code/trunk/java/engine/org/apache/derby/impl/sql/compile/BinaryOperatorNode.java

Repository	Revision	Date	User	Message
ASF	#233308	Thu Aug 18 11:07:30 UTC 2005	kmarsden	Backport of ~~DERBY-488~~ DatabaseMetaData.getColumns() fails on iSeries JDK 1.4 with verfier error on generated class. contributed by Daniel Debrunner
				Files Changed
				MODIFY /db/derby/code/branches/10.0/java/engine/org/apache/derby/impl/sql/compile/BinaryOperatorNode.java