fix Size() duplicate counting rows size. (#17148)

之前统计 partition state 里面的 rows 时，使用的是 row.Batch 的地址昨晚去重的手段，绝大多数情况下没有问题，但一条记录也可能会重复推到 CN，不属于同一个 logtail, 自然也不属于同一个 batch，所以就做不到去重的目的。现在使用 rowid 去重。

Approved by: @XuPeng-SH, @heni02

pkg/vm/engine/disttae/txn_table.go

@@ -217,34 +217,21 @@ func (tbl *txnTable) Size(ctx context.Context, columnName string) (uint64, error
 			}
 		})
 
-	// Different rows may belong to same batch. So we have
-	// to record the batch which we have already handled to avoid
-	// repetitive computation
-	handled := make(map[*batch.Batch]struct{})
-	// Calculate the in mem size
-	// TODO: It might includ some deleted row size
 	iter := part.NewRowsIter(ts, nil, false)
 	defer func() { _ = iter.Close() }()
 	for iter.Next() {
 		entry := iter.Entry()
 		if _, ok := deletes[entry.RowID]; ok {
 			continue
 		}
-		if _, ok := handled[entry.Batch]; ok {
-			continue
-		}
+
 		for i, s := range entry.Batch.Attrs {
 			if _, ok := neededCols[s]; ok {
-				szInPart += uint64(entry.Batch.Vecs[i].Size())
+				szInPart += uint64(entry.Batch.Vecs[i].Size() / entry.Batch.Vecs[i].Length())
 			}
 		}
-		handled[entry.Batch] = struct{}{}
 	}
 
-	//s := e.Stats(ctx, pb.StatsInfoKey{
-	//	DatabaseID: tbl.db.databaseId,
-	//	TableID:    tbl.tableId,
-	//}, true)
 	s, _ := tbl.Stats(ctx, true)
 	if s == nil {
 		return szInPart, nil

test/distributed/cases/mo_cloud/mo_cloud.result

@@ -697,7 +697,7 @@ triggers    0    0    accountadmin
 engines    0    0    accountadmin
 routines    0    0    accountadmin
 parameters    0    0    accountadmin
-keywords    747    45171    accountadmin
+keywords    747    44820    accountadmin
 schema_privileges    0    0    accountadmin
 table_privileges    0    0    accountadmin
 column_privileges    0    0    accountadmin