jinxing64 commented on a change in pull request #1333: [CALCITE-3214] Add
UnionToUnionRule for materialization matching.
URL: https://github.com/apache/calcite/pull/1333#discussion_r314568523
##########
File path:
core/src/main/java/org/apache/calcite/plan/MaterializedViewSubstitutionVisitor.java
##########
@@ -180,6 +182,39 @@ public UnifyResult apply(UnifyRuleCall call) {
}
}
+ /**
+ * Implementation of {@link SubstitutionVisitor.UnifyRule} that matches a
+ * {@link MutableUnion} to a {@link MutableUnion} where the query and target
+ * have the same inputs but might not have the same order.
+ */
+ private static class UnionToUnionRule extends AbstractUnifyRule {
+ public static final UnionToUnionRule INSTANCE = new UnionToUnionRule();
+
+ private UnionToUnionRule() {
+ super(any(MutableUnion.class), any(MutableUnion.class), 0);
+ }
+
+ public UnifyResult apply(UnifyRuleCall call) {
+ final MutableUnion query = (MutableUnion) call.query;
+ final MutableUnion target = (MutableUnion) call.target;
+ List<MutableRel> queryInputs = query.getInputs();
+ List<MutableRel> targetInputs = target.getInputs();
+ if (queryInputs.size() == targetInputs.size()) {
+ while (!queryInputs.isEmpty()) {
Review comment:
hmm~ let me think. The process of removing elements might be
useful/necessary.
Let's make an example. Say Query and MV are like below:
```
Query:
Union
+--ScanA
+--ScanA
+--ScanB
MV:
Union
+--ScanA
+--ScanB
+--ScanB
```
Obviously the matching should be failed, but if I implement like below:
```
if (queryInputs.size() == targetInputs.size()) {
for (MutableRel rel： queryInputs) {
if (targetInputs.indexOf(queryInputs.get(0)) == -1) {
return null;
}
}
}
return true;
```
The matching will succeeded, which is not correct.
THX again for review this :)
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