Jadon Hansell created CAY-2911:
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Summary: Vertical Inheritance: Column Select Sometimes Null With
Vertically Inherited Entity
Key: CAY-2911
URL: https://issues.apache.org/jira/browse/CAY-2911
Project: Cayenne
Issue Type: Bug
Affects Versions: 5.0-M1
Reporter: Jadon Hansell
Attachments: CAY_column_query_issue.patch
This issue has symptoms similar to CAY-2552, where in EntityRowReader the
fields size from segmentMetadata isn't equal to columns list size in
RowDescriptor.
I think this might be caused by multiple columns in the RowDescriptor having
the same name, so they overwrite each other when building the fields map in the
segmentMetadata.
I have attached a patch including a breaking test on master.
The test contains the following: say I have two abstract entities {{Document}}
and {{{}DocumentLine{}}}. {{Document}} has child entities {{DocumentA}} and
{{{}DocumentB{}}}. {{DocumentLine}} has child entities {{DocumentALine}} and
{{{}DocumentBLine{}}}.
{{DocumentLine}} has a many-to-one relationship to {{Document}} called
"{{{}document{}}}" with foreign key {{{}DOCUMENT_LINE.DOCUMENT_ID{}}}.
{{DocumentB}} has a one-to-one relationship to {{DocumentA}} named
"{{{}relatedA{}}}", with a foreign key {{{}DOCUMENT_B.RELATED_A_ID{}}}. If this
relationship is removed the test passes.
If I query {{DocumentALine}} and column select {{DocumentALine.DOCUMENT}} to
get its corresponding {{{}DocumentA{}}}, it works correctly. If I query
{{DocumentBLine}} and column select {{DocumentBLine.DOCUMENT}} to get its
corresponding {{{}DocumentB{}}}, it returns {{{}null{}}}.
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