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Posted to dev@orc.apache.org by "Gang Wu (Jira)" <ji...@apache.org> on 2023/02/21 03:47:00 UTC

[jira] [Created] (ORC-1376) [C++] Support schema evolution

Gang Wu created ORC-1376:
----------------------------

             Summary: [C++] Support schema evolution
                 Key: ORC-1376
                 URL: https://issues.apache.org/jira/browse/ORC-1376
             Project: ORC
          Issue Type: New Feature
          Components: C++
            Reporter: Gang Wu


The Java ORC reader supports schema evolution by comparing readSchema with fileSchema [1] and creates a set of ConvertTreeReaders [2] to do the conversion.

[1] https://github.com/apache/orc/blob/main/java/core/src/java/org/apache/orc/impl/SchemaEvolution.java
[2] https://github.com/apache/orc/blob/main/java/core/src/java/org/apache/orc/impl/ConvertTreeReaderFactory.java#L60:14

The C++ reader does not support it yet.




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