asolimando commented on code in PR #4494:
URL: https://github.com/apache/calcite/pull/4494#discussion_r2259900702
##########
core/src/main/java/org/apache/calcite/rel/rules/IntersectToDistinctRule.java:
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@@ -126,12 +143,86 @@ public IntersectToDistinctRule(Class<? extends Intersect>
intersectClass,
call.transformTo(relBuilder.build());
}
+ /**
+ * Variant performing a partial aggregation pushdown.
+ *
+ * <p>Original query:
+ * <pre>{@code
+ * SELECT job FROM "scott".emp WHERE deptno = 10
+ * INTERSECT
+ * SELECT job FROM "scott".emp WHERE deptno = 20
+ * }</pre>
+ *
+ * <p>Query after conversion:
+ * <pre>{@code
+ * SELECT job
+ * FROM (
+ * SELECT job, SUM(c)
Review Comment:
Good catch! I went again through all the comments and Javadoc for the
original code and improved it to make it match the code more accurately and
eliminating the only Hive-related nomenclature still left (`R3` as the relation)
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