GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/18256
[SPARK-21042][SQL] Document Dataset.union is resolution by position
## What changes were proposed in this pull request?
Document Dataset.union is resolution by position, not by name, since this
has been a confusing point for a lot of users.
## How was this patch tested?
N/A - doc only change.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-21042
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18256.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 #18256
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