debabhishek53 commented on code in PR #4185:
URL: https://github.com/apache/gobblin/pull/4185#discussion_r3055684017


##########
gobblin-data-management/src/main/java/org/apache/gobblin/data/management/copy/iceberg/IcebergSource.java:
##########
@@ -152,10 +154,18 @@ public class IcebergSource extends 
FileBasedSource<String, FileAwareInputStream>
   /**
    * Optional {@link DateTimeFormatter} pattern controlling how the partition 
value is rendered.
    *
-   * <p>When {@code iceberg.filter.date=CURRENT_DATE} the reference datetime is
-   * {@link java.time.LocalDateTime#now()}, so a pattern that includes {@code 
HH} will embed
-   * the current clock-hour automatically — no separate hour config is needed.
-   * For a specific date (e.g. {@code 2025-04-03}), the time defaults to 
midnight (00:00).
+   * <p><b>CURRENT_DATE behaviour differs between the two paths:</b>
+   * <ul>
+   *   <li>When this property <em>is</em> set, {@code CURRENT_DATE} resolves to

Review Comment:
   Added the property name as iceberg.partition.value.datetime.format



##########
gobblin-data-management/src/main/java/org/apache/gobblin/data/management/copy/iceberg/IcebergSource.java:
##########
@@ -152,10 +154,18 @@ public class IcebergSource extends 
FileBasedSource<String, FileAwareInputStream>
   /**
    * Optional {@link DateTimeFormatter} pattern controlling how the partition 
value is rendered.
    *
-   * <p>When {@code iceberg.filter.date=CURRENT_DATE} the reference datetime is
-   * {@link java.time.LocalDateTime#now()}, so a pattern that includes {@code 
HH} will embed
-   * the current clock-hour automatically — no separate hour config is needed.
-   * For a specific date (e.g. {@code 2025-04-03}), the time defaults to 
midnight (00:00).
+   * <p><b>CURRENT_DATE behaviour differs between the two paths:</b>
+   * <ul>
+   *   <li>When this property <em>is</em> set, {@code CURRENT_DATE} resolves to
+   *       {@link java.time.LocalDateTime#now()}, so a pattern that includes 
{@code HH} embeds the
+   *       live clock-hour automatically — useful for truly hourly-partitioned 
tables.</li>
+   *   <li>When this property is <em>absent</em> (legacy path), {@code 
CURRENT_DATE} resolves to
+   *       {@link java.time.LocalDate#now()} at midnight (00:00), preserving 
the pre-PR behaviour

Review Comment:
   Added the property name as iceberg.partition.value.datetime.format



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