PaulJackson123 commented on code in PR #3495:
URL: https://github.com/apache/calcite/pull/3495#discussion_r1379317983
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core/src/main/java/org/apache/calcite/rel/metadata/RelMdColumnUniqueness.java:
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@@ -67,6 +70,9 @@ public class RelMdColumnUniqueness
public static final RelMetadataProvider SOURCE =
ReflectiveRelMetadataProvider.reflectiveSource(
new RelMdColumnUniqueness(),
BuiltInMetadata.ColumnUniqueness.Handler.class);
+ static final Set<SqlKind> PASSTHROUGH_AGGREGATIONS =
Review Comment:
If a row has a unique column, then an aggregation that returns a value from
that column is also to be unique. These are the aggregations that do that.
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