[feat](nereids) add is_merge tag for data sink

fe/fe-core/src/main/java/org/apache/doris/nereids/glue/translator/PhysicalPlanTranslator.java

@@ -2145,6 +2145,9 @@ public PlanFragment visitPhysicalQuickSort(PhysicalQuickSort<? extends Plan> sor
             }
             SortNode sortNode = (SortNode) inputFragment.getPlanRoot().getChild(0);
             ((ExchangeNode) inputFragment.getPlanRoot()).setMergeInfo(sortNode.getSortInfo());
+            if (inputFragment.hasChild(0) && inputFragment.getChild(0).getSink() != null) {
+                inputFragment.getChild(0).getSink().setMerge(true);
+            }
             sortNode.setMergeByExchange();
             sortNode.setChildrenDistributeExprLists(distributeExprLists);
         }
@@ -2196,6 +2199,9 @@ public PlanFragment visitPhysicalTopN(PhysicalTopN<? extends Plan> topN, PlanTra
             ExchangeNode exchangeNode = (ExchangeNode) inputFragment.getPlanRoot();
             exchangeNode.setChildrenDistributeExprLists(distributeExprLists);
             exchangeNode.setMergeInfo(((SortNode) exchangeNode.getChild(0)).getSortInfo());
+            if (inputFragment.hasChild(0) && inputFragment.getChild(0).getSink() != null) {
+                inputFragment.getChild(0).getSink().setMerge(true);
+            }
             exchangeNode.setLimit(topN.getLimit());
             exchangeNode.setOffset(topN.getOffset());
             ((SortNode) exchangeNode.getChild(0)).setMergeByExchange();

fe/fe-core/src/main/java/org/apache/doris/planner/DataSink.java

@@ -39,6 +39,7 @@
 public abstract class DataSink {
     // Fragment that this DataSink belongs to. Set by the PlanFragment enclosing this sink.
     protected PlanFragment fragment;
+    protected boolean isMerge = false;
 
     /**
      * Return an explain string for the DataSink. Each line of the explain will be
@@ -77,4 +78,12 @@ public static DataSink createDataSink(TableIf table) throws AnalysisException {
             throw new AnalysisException("Unknown table type " + table.getType());
         }
     }
+
+    public boolean isMerge() {
+        return isMerge;
+    }
+
+    public void setMerge(boolean merge) {
+        isMerge = merge;
+    }
 }

fe/fe-core/src/main/java/org/apache/doris/planner/DataStreamSink.java

@@ -176,6 +176,9 @@ public String getExplainString(String prefix, TExplainLevel explainLevel) {
             strBuilder.append(prefix).append("  PROJECTION TUPLE: ").append(outputTupleDesc.getId());
             strBuilder.append("\n");
         }
+        if (isMerge) {
+            strBuilder.append("IS_MERGE: true\n");
+        }
 
         return strBuilder.toString();
     }
@@ -234,6 +237,7 @@ protected TDataSink toThrift() {
                 tStreamSink.addToTabletSinkExprs(expr.treeToThrift());
             }
         }
+        tStreamSink.setIsMerge(isMerge);
         tStreamSink.setTabletSinkTxnId(tabletSinkTxnId);
         result.setStreamSink(tStreamSink);
         return result;

gensrc/thrift/DataSinks.thrift

@@ -189,6 +189,7 @@ struct TDataStreamSink {
   11: optional i64 tablet_sink_txn_id
   12: optional Types.TTupleId tablet_sink_tuple_id
   13: optional list<Exprs.TExpr> tablet_sink_exprs
+  14: optional bool is_merge
 }
 
 struct TMultiCastDataStreamSink {