GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/19545
[SPARK-21929][SQL] Support `ALTER TABLE table_name ADD COLUMNS(..)` for ORC
data source
## What changes were proposed in this pull request?
When SPARK-19261 implements `ALTER TABLE ADD COLUMNS`, ORC data source is
omitted due to SPARK-14387, SPARK-16628, and SPARK-18355. Now, those issues are
fixed and Spark 2.3 is using Spark schema to read ORC table instead of ORC file
schema. This PR enables `ALTER TABLE ADD COLUMNS` for ORC data source.
## How was this patch tested?
Pass the updated and added test cases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-21929
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19545.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 #19545
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