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https://issues.apache.org/jira/browse/ORC-613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley resolved ORC-613.
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Fix Version/s: 1.6.3
1.5.10
Assignee: Lei Sun
Resolution: Fixed
I committed this. Thanks, Lei!
> OrcMapredRecordReader mis-reuse struct object when actual children schema
> differs
> ---------------------------------------------------------------------------------
>
> Key: ORC-613
> URL: https://issues.apache.org/jira/browse/ORC-613
> Project: ORC
> Issue Type: Bug
> Components: Java
> Reporter: Lei Sun
> Assignee: Lei Sun
> Priority: Major
> Fix For: 1.5.10, 1.6.3
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When reading from schema like following:
> {{uniontype <struct<field0, field1, ..., fieldN>, struct<>> }}
> `org.apache.orc.mapreduce.OrcMapreduceRecordReader#nextStruct` will determine
> if previous object's schema can be reused or not. The determination of this
> is problematic, since it only checks the top-level type (OrcStruct) but not
> the schema of OrcStruct. Therefore, if encountering schema like above, and
> when struct at tag_0 is processed followed with a struct at tag_1, it will
> reuse the tag_0's struct schema which results in in correct result.
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