NobiGo commented on code in PR #4099:
URL: https://github.com/apache/calcite/pull/4099#discussion_r1891138481
##########
core/src/main/java/org/apache/calcite/rel/metadata/RelMdUtil.java:
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@@ -210,6 +210,18 @@ public static boolean
areColumnsDefinitelyUnique(RelMetadataQuery mq,
return b != null && b;
}
+ public static boolean isRelDefinitelyEmpty(RelMetadataQuery mq,
+ RelNode rel) {
+ Boolean b = mq.isEmpty(rel);
+ return b != null && b;
+ }
+
+ public static boolean isRelDefinitelyNotEmpty(RelMetadataQuery mq,
Review Comment:
It can't because the isEmpty value can be null.
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