Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/15966#discussion_r89003713
--- Diff: docs/sql-programming-guide.md ---
@@ -1073,6 +1073,16 @@ 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. In other words,
--- End diff --
> 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 **with this
value** before writing. In other words, this determines the maximum number of
concurrent JDBC connections.
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