Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20610#discussion_r168401130
--- Diff: docs/sql-programming-guide.md ---
@@ -1004,6 +1004,29 @@ Configuration of Parquet can be done using the
`setConf` method on `SparkSession
</tr>
</table>
+## ORC Files
+
+Since Spark 2.3, Spark supports a vectorized ORC reader with a new ORC
file format for ORC files.
+To do that, the following configurations are newly added. The vectorized
reader is used for the
+native ORC tables (e.g., the ones created using the clause `USING ORC`)
when `spark.sql.orc.impl`
+is set to `native` and `spark.sql.orc.enableVectorizedReader` is set to
`true`. For the Hive ORC
+serde tables (e.g., the ones created using the clause `USING HIVE OPTIONS
(fileFormat 'ORC')`),
+the vectorized reader is used when `spark.sql.hive.convertMetastoreOrc` is
also set to `true`.
+
+<table class="table">
+ <tr><th><b>Property
Name</b></th><th><b>Default</b></th><th><b>Meaning</b></th></tr>
+ <tr>
+ <td><code>spark.sql.orc.impl</code></td>
+ <td><code>hive</code></td>
+ <td>The name of ORC implementation. It can be one of
<code>native</code> and <code>hive</code>. <code>native</code> means the native
ORC support that is built on Apache ORC 1.4.1. `hive` means the ORC library in
Hive 1.2.1 which is used prior to Spark 2.3.</td>
--- End diff --
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