rdblue commented on a change in pull request #31355:
URL: https://github.com/apache/spark/pull/31355#discussion_r565733924
##########
File path:
sql/catalyst/src/main/java/org/apache/spark/sql/connector/distributions/ClusteredDistribution.java
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@@ -32,4 +32,13 @@
* Returns clustering expressions.
*/
Expression[] clustering();
+
+ /**
+ * Returns the number of partitions required by this write.
+ * <p>
+ * Implementations may want to override this if it requires the specific
number of partitions.
+ *
+ * @return the required number of partitions, non-positive values mean no
requirement.
+ */
+ default int requiredNumPartitions() { return 0; }
Review comment:
Why not also add a parallelism requirement to `UnspecifiedDistribution`?
That could insert a coalesce.
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