changliiu commented on code in PR #35042:
URL: https://github.com/apache/beam/pull/35042#discussion_r2114393653


##########
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/PartitionMetadataDao.java:
##########
@@ -178,47 +179,57 @@ public List<String> findAllTableIndexes() {
    *
    * @return the earliest partition watermark which is not in a {@link 
State#FINISHED} state.
    */
-  public @Nullable Timestamp getUnfinishedMinWatermark() {
+  public @Nullable Timestamp getUnfinishedMinWatermark(Optional<Timestamp> 
since) {

Review Comment:
   I tend to make it clear here that this "since" parameter is optional - call 
sites can omit this field if they don't care, instead of figuring out what does 
this mean and give a valid value.
   
   Please re-open if you have strong opinion. Thanks!



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