[GitHub] [calcite] liyafan82 commented on a change in pull request #2145: [CALCITE-4239] RelMdUniqueKeys returns wrong unique keys for Aggregate with grouping sets

[GitBox]

liyafan82 commented on a change in pull request #2145:
URL: https://github.com/apache/calcite/pull/2145#discussion_r486839323



##########
File path: 
core/src/main/java/org/apache/calcite/rel/metadata/RelMdUniqueKeys.java
##########
@@ -246,8 +246,14 @@ private RelMdUniqueKeys() {}
 
   public Set<ImmutableBitSet> getUniqueKeys(Aggregate rel, RelMetadataQuery mq,
       boolean ignoreNulls) {
-    // group by keys form a unique key
-    return ImmutableSet.of(rel.getGroupSet());
+    if (Aggregate.isSimple(rel) || ignoreNulls) {
+      // group by keys form a unique key
+      return ImmutableSet.of(rel.getGroupSet());

Review comment:
       I see. Thanks for the clarification.

##########
File path: 
core/src/main/java/org/apache/calcite/rel/metadata/RelMdUniqueKeys.java
##########
@@ -246,8 +246,14 @@ private RelMdUniqueKeys() {}
 
   public Set<ImmutableBitSet> getUniqueKeys(Aggregate rel, RelMetadataQuery mq,
       boolean ignoreNulls) {
-    // group by keys form a unique key
-    return ImmutableSet.of(rel.getGroupSet());
+    if (Aggregate.isSimple(rel) || ignoreNulls) {
+      // group by keys form a unique key
+      return ImmutableSet.of(rel.getGroupSet());

Review comment:
       I see. Thanks for the clarification.




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