enhance: Optimize grow slice cost during query (#34254)

issue: #32252
pr: #34253

This PR try to pre-allocate FieldData for Reduce operations in the Query
chain using typeutil.PrepareResultFieldData to avoid the overhead of
dynamically growing the slice during appendFieldData process.

---------

Signed-off-by: Wei Liu <wei.liu@zilliz.com>

internal/proxy/task_query.go

@@ -603,7 +603,6 @@ func reduceRetrieveResults(ctx context.Context, retrieveResults []*internalpb.Re
 		return ret, nil
 	}
 
-	ret.FieldsData = make([]*schemapb.FieldData, len(validRetrieveResults[0].GetFieldsData()))
 	idSet := make(map[interface{}]struct{})
 	cursors := make([]int64, len(validRetrieveResults))
 
@@ -626,6 +625,7 @@ func reduceRetrieveResults(ctx context.Context, retrieveResults []*internalpb.Re
 		}
 	}
 
+	ret.FieldsData = typeutil.PrepareResultFieldData(validRetrieveResults[0].GetFieldsData(), int64(loopEnd))
 	var retSize int64
 	maxOutputSize := paramtable.Get().QuotaConfig.MaxOutputSize.GetAsInt64()
 	for j := 0; j < loopEnd; {

internal/querynodev2/segments/result.go

@@ -427,7 +427,7 @@ func MergeInternalRetrieveResult(ctx context.Context, retrieveResults []*interna
 		loopEnd = int(param.limit)
 	}
 
-	ret.FieldsData = make([]*schemapb.FieldData, len(validRetrieveResults[0].Result.GetFieldsData()))
+	ret.FieldsData = typeutil.PrepareResultFieldData(validRetrieveResults[0].Result.GetFieldsData(), int64(loopEnd))
 	idTsMap := make(map[interface{}]int64)
 	cursors := make([]int64, len(validRetrieveResults))
 
@@ -556,6 +556,7 @@ func MergeSegcoreRetrieveResults(ctx context.Context, retrieveResults []*segcore
 		limit = int(param.limit)
 	}
 
+	ret.FieldsData = typeutil.PrepareResultFieldData(validRetrieveResults[0].Result.GetFieldsData(), int64(loopEnd))
 	cursors := make([]int64, len(validRetrieveResults))
 	idTsMap := make(map[any]int64)