enhance: [2.4] Make LeaderView Manager filter use map index (#32505) (#32528)

Cherry-pick from master
pr: #32505
See also #32165

Change `LeaderViewFilter` to interface to provided map key to avoid
iterating all key-values in LeaderViewManager

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

internal/querycoordv2/meta/leader_view_manager.go

@@ -24,44 +24,86 @@ import (
 	"github.com/milvus-io/milvus/internal/proto/querypb"
 )
 
-type LeaderViewFilter = func(view *LeaderView) bool
-
-func WithChannelName2LeaderView(channelName string) LeaderViewFilter {
-	return func(view *LeaderView) bool {
-		return view.Channel == channelName
-	}
+type LeaderViewFilter interface {
+	Match(*LeaderView) bool
+	Node() (int64, bool)
+	ChannelName() (string, bool)
 }
 
-func WithCollectionID2LeaderView(collectionID int64) LeaderViewFilter {
-	return func(view *LeaderView) bool {
-		return view.CollectionID == collectionID
-	}
+type lvFilterFunc func(view *LeaderView) bool
+
+func (f lvFilterFunc) Match(view *LeaderView) bool {
+	return f(view)
+}
+
+func (f lvFilterFunc) Node() (int64, bool) {
+	return -1, false
+}
+
+func (f lvFilterFunc) ChannelName() (string, bool) {
+	return "", false
+}
+
+type lvChannelNameFilter string
+
+func (f lvChannelNameFilter) Match(v *LeaderView) bool {
+	return v.Channel == string(f)
+}
+
+func (f lvChannelNameFilter) Node() (int64, bool) {
+	return -1, false
+}
+
+func (f lvChannelNameFilter) ChannelName() (string, bool) {
+	return string(f), true
+}
+
+type lvNodeFilter int64
+
+func (f lvNodeFilter) Match(v *LeaderView) bool {
+	return v.ID == int64(f)
+}
+
+func (f lvNodeFilter) Node() (int64, bool) {
+	return int64(f), true
+}
+
+func (f lvNodeFilter) ChannelName() (string, bool) {
+	return "", false
 }
 
 func WithNodeID2LeaderView(nodeID int64) LeaderViewFilter {
-	return func(view *LeaderView) bool {
-		return view.ID == nodeID
-	}
+	return lvNodeFilter(nodeID)
+}
+
+func WithChannelName2LeaderView(channelName string) LeaderViewFilter {
+	return lvChannelNameFilter(channelName)
+}
+
+func WithCollectionID2LeaderView(collectionID int64) LeaderViewFilter {
+	return lvFilterFunc(func(view *LeaderView) bool {
+		return view.CollectionID == collectionID
+	})
 }
 
 func WithReplica2LeaderView(replica *Replica) LeaderViewFilter {
-	return func(view *LeaderView) bool {
+	return lvFilterFunc(func(view *LeaderView) bool {
 		if replica == nil {
 			return false
 		}
 		return replica.GetCollectionID() == view.CollectionID && replica.Contains(view.ID)
-	}
+	})
 }
 
 func WithSegment2LeaderView(segmentID int64, isGrowing bool) LeaderViewFilter {
-	return func(view *LeaderView) bool {
+	return lvFilterFunc(func(view *LeaderView) bool {
 		if isGrowing {
 			_, ok := view.GrowingSegments[segmentID]
 			return ok
 		}
 		_, ok := view.Segments[segmentID]
 		return ok
-	}
+	})
 }
 
 type LeaderView struct {
@@ -136,23 +178,56 @@ func (mgr *LeaderViewManager) GetByFilter(filters ...LeaderViewFilter) []*Leader
 }
 
 func (mgr *LeaderViewManager) getByFilter(filters ...LeaderViewFilter) []*LeaderView {
-	ret := make([]*LeaderView, 0)
-	for _, viewsOnNode := range mgr.views {
-		for _, view := range viewsOnNode {
-			allMatch := true
-			for _, fn := range filters {
-				if fn != nil && !fn(view) {
-					allMatch = false
-				}
-			}
+	otherFilters := make([]LeaderViewFilter, 0, len(filters))
+	var nodeID int64
+	var channelName string
+	var hasNodeID, hasChannelName bool
 
-			if allMatch {
-				ret = append(ret, view)
+	for _, filter := range filters {
+		if node, ok := filter.Node(); ok {
+			nodeID, hasNodeID = node, true
+			continue
+		}
+		if channel, ok := filter.ChannelName(); ok {
+			channelName, hasChannelName = channel, true
+			continue
+		}
+		otherFilters = append(otherFilters, filter)
+	}
+	mergedFilter := func(view *LeaderView) bool {
+		for _, filter := range otherFilters {
+			if !filter.Match(view) {
+				return false
+			}
+		}
+		return true
+	}
+
+	var candidates []channelViews
+	if hasNodeID {
+		nodeView, ok := mgr.views[nodeID]
+		if ok {
+			candidates = append(candidates, nodeView)
+		}
+	} else {
+		candidates = lo.Values(mgr.views)
+	}
+
+	var result []*LeaderView
+	for _, candidate := range candidates {
+		if hasChannelName {
+			if view, ok := candidate[channelName]; ok && mergedFilter(view) {
+				result = append(result, view)
+			}
+		} else {
+			for _, view := range candidate {
+				if mergedFilter(view) {
+					result = append(result, view)
+				}
 			}
 		}
 	}
-
-	return ret
+	return result
 }
 
 func (mgr *LeaderViewManager) GetLatestShardLeaderByFilter(filters ...LeaderViewFilter) *LeaderView {