jinxing64 commented on a change in pull request #1324: [CALCITE-3203] When
matching materializations, match Project with child of Aggregate
URL: https://github.com/apache/calcite/pull/1324#discussion_r306222697
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File path:
core/src/main/java/org/apache/calcite/plan/MaterializedViewSubstitutionVisitor.java
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@@ -259,6 +263,77 @@ public UnifyResult apply(UnifyRuleCall call) {
}
}
+ /**
+ * Implementation of {@link SubstitutionVisitor.UnifyRule} that matches a
+ * {@link MutableProject} on top of a {@link MutableAggregate} to a
+ * {@link MutableProject} on top of a {@link MutableAggregate}.
+ *
+ * <p>Example: aggregate calls of query is a subset of target.</p>
+ * <ul>
+ * <li>query: Project(projects: [$0, *(2, $1)])
+ * Aggregate(groupSet: {0}, groupSets: [{0}], calls:
[SUM($1)])
+ * Scan(table: [hr, emps])</li>
+ * <li>target: Project(projects: [$0, *(2, $1), *(2, $2)])
+ * Aggregate(groupSet: {0}, groupSets: [{0}], calls:
[SUM($1), COUNT()])
+ * Scan(table: [hr, emps])</li>
+ * </ul>
+ */
+ private static class ProjectOnAggregateToProjectOnAggregateUnifyRule
Review comment:
THX for look into this @hsyuan
I will update soon.
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