szehon-ho commented on code in PR #53571:
URL: https://github.com/apache/spark/pull/53571#discussion_r2743886272
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sql/catalyst/src/main/java/org/apache/spark/sql/connector/write/MergeSummary.java:
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@@ -27,6 +27,11 @@
@Evolving
public interface MergeSummary extends WriteSummary {
+ /**
+ * Returns the number of source rows.
+ */
+ long numSourceRows();
Review Comment:
nit: add -1 if not found to the comment ?
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