JingsongLi commented on code in PR #2512:
URL: https://github.com/apache/incubator-paimon/pull/2512#discussion_r1429385990


##########
paimon-common/src/main/java/org/apache/paimon/CoreOptions.java:
##########
@@ -459,7 +459,9 @@ public class CoreOptions implements Serializable {
                                             text(
                                                     "3. \"millis-to-micro\": 
Pads the sequence field that indicates time with precision of milli-second to 
micro-second."),
                                             text(
-                                                    "4. Composite pattern: for 
example, \"second-to-micro,row-kind-flag\"."))
+                                                    "4. \"inc-seq\": Pads the 
sequence field with auto increase sequence."),
+                                            text(
+                                                    "5. Composite pattern: for 
example, \"second-to-micro,row-kind-flag\"."))

Review Comment:
   `inc-seq, row-kind-flag` is supported? I think maybe this should be most 
popular composite pattern



##########
paimon-core/src/main/java/org/apache/paimon/mergetree/MergeTreeWriter.java:
##########
@@ -89,14 +93,22 @@ public MergeTreeWriter(
             boolean commitForceCompact,
             ChangelogProducer changelogProducer,
             @Nullable CommitIncrement increment,
-            WriterMetrics writerMetrics) {
+            WriterMetrics writerMetrics,
+            boolean incSeqPadding) {
         this.writeBufferSpillable = writeBufferSpillable;
         this.sortMaxFan = sortMaxFan;
         this.ioManager = ioManager;
         this.keyType = writerFactory.keyType();
         this.valueType = writerFactory.valueType();
         this.compactManager = compactManager;
-        this.newSequenceNumber = maxSequenceNumber + 1;
+        this.incSeqPadding = incSeqPadding;
+        if (maxSequenceNumber == -1) {
+            this.nextIncSequenceNumber = 0;
+        } else if (incSeqPadding) {
+            this.nextIncSequenceNumber = (maxSequenceNumber & INC_SEQ_MASK) + 
INC;

Review Comment:
   We should merge this into `SequenceGenerator`. There should be some refactor.



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