jerryshao commented on code in PR #12162:
URL: https://github.com/apache/gravitino/pull/12162#discussion_r3636035012
##########
api/src/main/java/org/apache/gravitino/tag/Tag.java:
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@@ -54,6 +54,26 @@ public interface Tag extends Auditable {
*/
Map<String, String> properties();
+ /**
+ * @return The allowed assignment values of the tag. {@link
Optional#empty()} means the tag is
+ * unrestricted. A present empty array means the tag only accepts
valueless assignments.
+ */
+ default Optional<String[]> allowedValues() {
+ return Optional.empty();
+ }
+
+ /**
+ * Returns the assignment values of the tag in the current metadata-object
context.
+ *
+ * <p>The return value is present only when the tag is returned for a
metadata object. A present
+ * empty array means the tag is directly or effectively assigned without
values.
Review Comment:
Also here. We'd better have a clear definition to separate different
scenarios.
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