pgaref opened a new pull request #575:
URL: https://github.com/apache/orc/pull/575
### What changes were proposed in this pull request?
Enable String conversion from varchar.
Currently createStringConvertTreeReader in ConvertTreeReaderFactory is
missing that opportunity
### Why are the changes needed?
Modify createStringConvertTreeReader to handle char, varchar and string
as part of the same group.
### How was this patch tested?
TestSchemaEvolution.testCharToStringEvolution
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