Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7142#discussion_r35897459
--- Diff: docs/sql-programming-guide.md ---
@@ -1890,10 +1890,10 @@ that these options will be deprecated in future
release as more optimizations ar
</tr>
<tr>
<td><code>spark.sql.codegen</code></td>
- <td>false</td>
+ <td>true</td>
<td>
When true, code will be dynamically generated at runtime for
expression evaluation in a specific
- query. For some queries with complicated expression this option can
lead to significant speed-ups.
+ query. For some queries with complicated expression this option can
lead to significant speed-ups.
However, for simple queries this can actually slow down query
execution.
--- End diff --
I meant 'for simple queries this can actually slow down query execution',
we had reduce the overhead of codegen, it's should not be noticeable even for
simple query (it does exists).
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