GitHub user wagnermarkd opened a pull request:
https://github.com/apache/orc/pull/40
ORC-54: Evolve schemas based on field name rather than index
Change evolution to compare column names when building mapping.
Misc notes:
- I've added a setting orc.tolerate.missing.schema to allow working with
data before HIVE-4243 was fixed. This is important for anyone who has older
data, though it limits the evolutions that can be supported
- A lot of changes in RecordReaderImpl to make the reader column vs writer
column difference explicit
- SARG tests are passing, but there's no test coverage for SARG +
evolution. Will work on that.
- Removed some unneeded checked exceptions.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wagnermarkd/orc ORC-54-public
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/orc/pull/40.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #40
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commit c24200900e55437a242034eda6a5cd5122cc3acc
Author: Mark Wagner <[email protected]>
Date: 2016-05-18T21:24:16Z
ORC-54: Evolve schemas based on field name rather than index
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