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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