GitHub user cloud-fan opened a pull request:

    [SPARK-26297][SQL] improve the doc of Distribution/Partitioning

    ## What changes were proposed in this pull request?
    Some documents of `Distribution/Partitioning` are stale and misleading, 
this PR fixes them:
    1. `ClusteredDistribution` doesn't have intra-partition requirement
    2. `OrderedDistribution` does not require tuples that share the same value 
being colocated in the same partition.
    3. `RangePartitioning` can provide a weaker guarantee for a prefix of its 
`ordering` expressions.
    ## How was this patch tested?
    comment-only PR.

You can merge this pull request into a Git repository by running:

    $ git pull doc

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #23249
commit 24ea28abd5a385351703335df33b26838d203fe3
Author: Wenchen Fan <wenchen@...>
Date:   2018-12-06T15:47:23Z

    improve the doc of Distribution/Partitioning



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