chunweilei commented on code in PR #3169:
URL: https://github.com/apache/calcite/pull/3169#discussion_r1175978371
##########
core/src/main/java/org/apache/calcite/rel/rules/materialize/MaterializedViewRule.java:
##########
@@ -1426,6 +1448,61 @@ protected enum MatchModality {
QUERY_PARTIAL
}
+ /**
+ * Check if the materialization is valid for this rule.
+ * If it does, cache the materialization's RelTableRef and
RelOptPredicateList.
+ */
+ protected class MaterializationMetadata {
+ private final Set<RelOptMaterialization> notValidMaterializations = new
HashSet<>();
+ private final Map<RelOptMaterialization, Set<RelTableRef>>
viewTableRefsMap = new HashMap<>();
+ private final Map<RelOptMaterialization, RelOptPredicateList>
+ viewPredicateListMap = new HashMap<>();
+
+ protected boolean isValidMaterialization(
+ RelMetadataQuery mq, RelOptMaterialization materialization) {
+ if (notValidMaterializations.contains(materialization)) {
+ return false;
+ } else if (viewTableRefsMap.containsKey(materialization)) {
+ return true;
Review Comment:
Should we use `viewTableRefsMap.containsKey(materialization) &&
viewPredicateListMap.containsKey(materialization)` to be more accurate?
##########
core/src/main/java/org/apache/calcite/rel/rules/materialize/MaterializedViewRule.java:
##########
@@ -92,6 +96,16 @@
public abstract class MaterializedViewRule<C extends
MaterializedViewRule.Config>
extends RelRule<C> {
+ /**
+ * Cache of RelMetadataQuery to MaterializationMetadata.
+ */
+ private final LoadingCache<RelMetadataQuery, MaterializationMetadata>
+ materializationMetadataCache =
+ CacheBuilder.newBuilder()
+ .expireAfterAccess(5, TimeUnit.MINUTES)
+ .maximumSize(1_024)
+ .build(CacheLoader.from(MaterializationMetadata::new));
Review Comment:
Is `1_024` a typo?
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