HyukjinKwon commented on a change in pull request #32546:
URL: https://github.com/apache/spark/pull/32546#discussion_r638682522
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File path: docs/sql-data-sources-orc.md
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@@ -172,3 +172,29 @@ When reading from Hive metastore ORC tables and inserting
to Hive metastore ORC
<td>2.0.0</td>
</tr>
</table>
+
+## Data Source Option
+
+Data source options of ORC can be set via:
+* the `.option`/`.options` methods of
+ * `DataFrameReader`
+ * `DataFrameWriter`
+ * `DataStreamReader`
+ * `DataStreamWriter`
+
+<table class="table">
+ <tr><th><b>Property
Name</b></th><th><b>Default</b></th><th><b>Meaning</b></th><th><b>Scope</b></th></tr>
+ <tr>
+ <td><code>mergeSchema</code></td>
+ <td>None</td>
Review comment:
@itholic it has the same issue. The default value isn't `None` but
`false`.
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