viirya commented on code in PR #39470:
URL: https://github.com/apache/spark/pull/39470#discussion_r1065183384
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docs/sql-performance-tuning.md:
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@@ -342,4 +371,33 @@ Data skew can severely downgrade the performance of join
queries. This feature d
</td>
<td>3.0.0</td>
</tr>
+ <tr>
+ <td><code>spark.sql.adaptive.forceOptimizeSkewedJoin</code></td>
+ <td>false</td>
+ <td>
+ When true, force enable OptimizeSkewedJoin even if it introduces
extra shuffle.
Review Comment:
For `OptimizeSkewedJoin`, it might be hard to understand what it means here.
May we provide a little context? For example,
```suggestion
When true, force enable OptimizeSkewedJoin, which is an adaptive
rule to optimize skewed joins to avoid straggler tasks, even if it introduces
extra shuffle.
```
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