Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/15966#discussion_r88989788
--- Diff: docs/sql-programming-guide.md ---
@@ -1073,6 +1073,15 @@ the following case-sensitive options:
</tr>
<tr>
+ <td><code>numPartitions</code></td>
+ <td>
+ The number of partitions that can be used, if set. It works by
limiting both read and write
+ operations' parallelism. If the number of partitions to write
exceeds this limit, the
+ operation will coalesce the data set to fewer partitions before
writing.
--- End diff --
Sure. I'll add that, too.
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