[minor] Add comments for tag without timeRetained

apache · Jun 20, 2024 · c46a256 · c46a256
1 parent 9e98cda
commit c46a256
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/paimon-core/src/main/java/org/apache/paimon/utils/TagManager.java b/paimon-core/src/main/java/org/apache/paimon/utils/TagManager.java
@@ -102,6 +102,11 @@ public void createTag(
         } else {
             Path newTagPath = tagPath(tagName);
             try {
+                // When timeRetained is not defined, please do not write the tagCreatorTime field,
+                // as this will cause older versions (<= 0.7) of readers to be unable to read this
+                // tag.
+                // When timeRetained is defined, it is fine, because timeRetained is the new
+                // feature.
                 fileIO.writeFileUtf8(
                         newTagPath,
                         timeRetained != null