[Bug]: The query outputs sparse vector but the vector dim is always 0

[ThreadDao]

Is there an existing issue for this?

• [X] I have searched the existing issues

Current Behavior

Insert sparse vector and query output sparse vector, the dim of inserted sparse vector dim is int(se.positions[se.len-1]) + 1, the dim of query output vector is always 0

# inserted sparse vector:
 dim: (int) 42,
 len: (int) 21

# output sparse vector:
dim: (int) 0,
len: (int) 21

• case:

  func TestQuerySparseVector(t *testing.T) {
  t.Parallel()
  idxInverted := entity.NewGenericIndex(common.DefaultSparseVecFieldName, "SPARSE_INVERTED_INDEX", map[string]string{"drop_ratio_build": "0.2", "metric_type": "IP"})
  idxWand := entity.NewGenericIndex(common.DefaultSparseVecFieldName, "SPARSE_WAND", map[string]string{"drop_ratio_build": "0.3", "metric_type": "IP"})
  for _, idx := range []entity.Index{idxInverted, idxWand} {
      ctx := createContext(t, time.Second*common.DefaultTimeout*2)
      // connect
      mc := createMilvusClient(ctx, t)
  
      // create -> insert [0, 3000) -> flush -> index -> load
      cp := CollectionParams{CollectionFieldsType: Int64VarcharSparseVec, AutoID: false, EnableDynamicField: false,
          ShardsNum: common.DefaultShards, Dim: common.DefaultDim, MaxLength: common.TestMaxLen}
      collName := createCollection(ctx, t, mc, cp)
  
      // index
      idxHnsw, _ := entity.NewIndexHNSW(entity.L2, 8, 96)
      mc.CreateIndex(ctx, collName, common.DefaultFloatVecFieldName, idxHnsw, false)
      mc.CreateIndex(ctx, collName, common.DefaultSparseVecFieldName, idx, false)
  
      // insert
      intColumn, _, floatColumn := common.GenDefaultColumnData(0, common.DefaultNb, common.DefaultDim)
      varColumn := common.GenColumnData(0, common.DefaultNb, entity.FieldTypeVarChar, common.DefaultVarcharFieldName)
      sparseColumn := common.GenColumnData(0, common.DefaultNb, entity.FieldTypeSparseVector, common.DefaultSparseVecFieldName, common.WithSparseVectorLen(20))
      mc.Insert(ctx, collName, "", intColumn, varColumn, floatColumn, sparseColumn)
      mc.Flush(ctx, collName, false)
      mc.LoadCollection(ctx, collName, false)
  
      // count(*)
      countRes, _ := mc.Query(ctx, collName, []string{}, fmt.Sprintf("%s >=0", common.DefaultIntFieldName), []string{common.QueryCountFieldName})
      require.Equal(t, int64(common.DefaultNb), countRes.GetColumn(common.QueryCountFieldName).(*entity.ColumnInt64).Data()[0])
  
      // query
      queryResult, err := mc.Query(ctx, collName, []string{}, fmt.Sprintf("%s in [0, 1]", common.DefaultIntFieldName), []string{"*"})
      common.CheckErr(t, err, true)
      common.CheckOutputFields(t, queryResult, []string{common.DefaultIntFieldName, common.DefaultVarcharFieldName, common.DefaultFloatVecFieldName, common.DefaultSparseVecFieldName})
      common.CheckQueryResult(t, queryResult, []entity.Column{intColumn.Slice(0, 2), varColumn.Slice(0, 2), floatColumn.Slice(0, 2), sparseColumn.Slice(0, 2)})
  }
  }

Expected Behavior

No response

Steps To Reproduce

No response

Environment

No response

Anything else?

No response

[ThreadDao]

/assign @congqixia