Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20484#discussion_r165580446
--- Diff: docs/sql-programming-guide.md ---
@@ -1776,6 +1776,66 @@ working with timestamps in `pandas_udf`s to get the
best performance, see
## Upgrading From Spark SQL 2.2 to 2.3
+ - Since Spark 2.3, Spark supports a vectorized ORC reader with a new ORC
file format for ORC files and Hive ORC tables. To do that, the following
configurations are newly added or change their default values.
+
+ <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>native</code>
+ </td>
+ <td>
+ The name of ORC implementation: <code>native</code> means the
native ORC support that is built on Apache ORC 1.4.1 instead of the ORC library
in Hive 1.2.1. It is <code>hive</code> by default prior to Spark 2.3.
--- End diff --
I think this is newly added config. So `It is <code>hive</code> by default
prior to Spark 2.3.` sounds like it is an existing config before 2.3.
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