MM-33746 Add TotalMsgCountRoot and MsgCountRoot columns (#17150)

2021-03-31 16:51:02 +03:00
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -320,6 +320,10 @@ jobs:
              mattermost/mattermost-build-server:20201119_golang-1.15.5 \
              bash -c "ulimit -n 8096; make ARGS='version' run-cli && make MM_SQLSETTINGS_DATASOURCE='postgres://mmuser:mostest@postgres:5432/latest?sslmode=disable&connect_timeout=10' ARGS='version' run-cli"

+            echo "Ignoring known mismatch: ChannelMembers.MsgCountRoot"
+            docker-compose --no-ansi exec -T postgres sh -c 'exec echo "ALTER TABLE ChannelMembers DROP COLUMN MsgCountRoot;" | exec psql -U mmuser -d migrated'
+            docker-compose --no-ansi exec -T postgres sh -c 'exec echo "ALTER TABLE ChannelMembers DROP COLUMN MsgCountRoot;" | exec psql -U mmuser -d latest'
+
            echo "Generating dump"
            docker-compose --no-ansi exec -T postgres pg_dump --schema-only -d migrated -U mmuser > migrated.sql
            docker-compose --no-ansi exec -T postgres pg_dump --schema-only -d latest -U mmuser > latest.sql
@@ -349,9 +353,13 @@ jobs:
              mattermost/mattermost-build-server:20201119_golang-1.15.5 \
              bash -c "ulimit -n 8096; make ARGS='version' run-cli && make MM_SQLSETTINGS_DATASOURCE='mmuser:mostest@tcp(mysql:3306)/latest?charset=utf8mb4,utf8&readTimeout=30s&writeTimeout=30s' ARGS='version' run-cli"

+
            echo "Ignoring known MySQL mismatch: ChannelMembers.SchemeGuest"
            docker-compose --no-ansi exec -T mysql mysql -D migrated -uroot -pmostest -e "ALTER TABLE ChannelMembers DROP COLUMN SchemeGuest;"
            docker-compose --no-ansi exec -T mysql mysql -D latest -uroot -pmostest -e "ALTER TABLE ChannelMembers DROP COLUMN SchemeGuest;"
+            echo "Ignoring known MySQL mismatch: ChannelMembers.MentionCountRoot"
+            docker-compose --no-ansi exec -T mysql mysql -D migrated -uroot -pmostest -e "ALTER TABLE ChannelMembers DROP COLUMN MsgCountRoot;"
+            docker-compose --no-ansi exec -T mysql mysql -D latest -uroot -pmostest -e "ALTER TABLE ChannelMembers DROP COLUMN MsgCountRoot;"

            echo "Generating dump"
            docker-compose --no-ansi exec -T mysql mysqldump --skip-opt --no-data --compact -u root -pmostest migrated > migrated.sql
--- a/app/channel.go
+++ b/app/channel.go
@@ -1871,6 +1871,7 @@ func (a *App) GetChannelUnread(channelID, userID string) (*model.ChannelUnread,

 	if channelUnread.NotifyProps[model.MARK_UNREAD_NOTIFY_PROP] == model.CHANNEL_MARK_UNREAD_MENTION {
 		channelUnread.MsgCount = 0
+		channelUnread.MsgCountRoot = 0
 	}

 	return channelUnread, nil
--- a/app/post.go
+++ b/app/post.go
@@ -1411,7 +1411,7 @@ func (a *App) countMentionsFromPost(user *model.User, post *model.Post) (int, *m

 	if channel.Type == model.CHANNEL_DIRECT {
 		// In a DM channel, every post made by the other user is a mention
-		count, nErr := a.Srv().Store.Channel().CountPostsAfter(post.ChannelId, post.CreateAt-1, channel.GetOtherUserIdForDM(user.Id))
+		count, _, nErr := a.Srv().Store.Channel().CountPostsAfter(post.ChannelId, post.CreateAt-1, channel.GetOtherUserIdForDM(user.Id))
 		if nErr != nil {
 			return 0, model.NewAppError("countMentionsFromPost", "app.channel.count_posts_since.app_error", nil, nErr.Error(), http.StatusInternalServerError)
 		}
--- a/app/team.go
+++ b/app/team.go
@@ -1133,12 +1133,14 @@ func (a *App) AddTeamMemberByInviteId(inviteId, userID string) (*model.TeamMembe

 func (a *App) GetTeamUnread(teamID, userID string) (*model.TeamUnread, *model.AppError) {
 	channelUnreads, err := a.Srv().Store.Team().GetChannelUnreadsForTeam(teamID, userID)
+
 	if err != nil {
 		return nil, model.NewAppError("GetTeamUnread", "app.team.get_unread.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}

 	var teamUnread = &model.TeamUnread{
 		MsgCount:     0,
+		MsgCountRoot: 0,
 		MentionCount: 0,
 		TeamId:       teamID,
 	}
@@ -1148,6 +1150,7 @@ func (a *App) GetTeamUnread(teamID, userID string) (*model.TeamUnread, *model.Ap

 		if cu.NotifyProps[model.MARK_UNREAD_NOTIFY_PROP] != model.CHANNEL_MARK_UNREAD_MENTION {
 			teamUnread.MsgCount += cu.MsgCount
+			teamUnread.MsgCountRoot += cu.MsgCountRoot
 		}
 	}

@@ -1677,6 +1680,7 @@ func (a *App) GetTeamsUnreadForUser(excludeTeamId string, userID string) ([]*mod

 		if cu.NotifyProps[model.MARK_UNREAD_NOTIFY_PROP] != model.CHANNEL_MARK_UNREAD_MENTION {
 			tu.MsgCount += cu.MsgCount
+			tu.MsgCountRoot += cu.MsgCountRoot
 		}

 		return tu
@@ -1689,6 +1693,7 @@ func (a *App) GetTeamsUnreadForUser(excludeTeamId string, userID string) ([]*mod
 		} else {
 			membersMap[id] = unreads(data[i], &model.TeamUnread{
 				MsgCount:     0,
+				MsgCountRoot: 0,
 				MentionCount: 0,
 				TeamId:       id,
 			})
--- a/model/channel.go
+++ b/model/channel.go
@@ -34,24 +34,25 @@ const (
 )

 type Channel struct {
-	Id               string                 `json:"id"`
-	CreateAt         int64                  `json:"create_at"`
-	UpdateAt         int64                  `json:"update_at"`
-	DeleteAt         int64                  `json:"delete_at"`
-	TeamId           string                 `json:"team_id"`
-	Type             string                 `json:"type"`
-	DisplayName      string                 `json:"display_name"`
-	Name             string                 `json:"name"`
-	Header           string                 `json:"header"`
-	Purpose          string                 `json:"purpose"`
-	LastPostAt       int64                  `json:"last_post_at"`
-	TotalMsgCount    int64                  `json:"total_msg_count"`
-	ExtraUpdateAt    int64                  `json:"extra_update_at"`
-	CreatorId        string                 `json:"creator_id"`
-	SchemeId         *string                `json:"scheme_id"`
-	Props            map[string]interface{} `json:"props" db:"-"`
-	GroupConstrained *bool                  `json:"group_constrained"`
-	Shared           *bool                  `json:"shared"`
+	Id                string                 `json:"id"`
+	CreateAt          int64                  `json:"create_at"`
+	UpdateAt          int64                  `json:"update_at"`
+	DeleteAt          int64                  `json:"delete_at"`
+	TeamId            string                 `json:"team_id"`
+	Type              string                 `json:"type"`
+	DisplayName       string                 `json:"display_name"`
+	Name              string                 `json:"name"`
+	Header            string                 `json:"header"`
+	Purpose           string                 `json:"purpose"`
+	LastPostAt        int64                  `json:"last_post_at"`
+	TotalMsgCount     int64                  `json:"total_msg_count"`
+	ExtraUpdateAt     int64                  `json:"extra_update_at"`
+	CreatorId         string                 `json:"creator_id"`
+	SchemeId          *string                `json:"scheme_id"`
+	Props             map[string]interface{} `json:"props" db:"-"`
+	GroupConstrained  *bool                  `json:"group_constrained"`
+	Shared            *bool                  `json:"shared"`
+	TotalMsgCountRoot int64                  `json:"total_msg_count_root"`
 }

 type ChannelWithTeamData struct {
--- a/model/channel_count.go
+++ b/model/channel_count.go
@@ -14,11 +14,12 @@ import (

 type ChannelCounts struct {
 	Counts      map[string]int64 `json:"counts"`
+	CountsRoot  map[string]int64 `json:"counts_root"`
 	UpdateTimes map[string]int64 `json:"update_times"`
 }

 func (o *ChannelCounts) Etag() string {
-
+	// we don't include CountsRoot in ETag calculation, since it's a deriviative
 	ids := []string{}
 	for id := range o.Counts {
 		ids = append(ids, id)
--- a/model/channel_member.go
+++ b/model/channel_member.go
@@ -27,6 +27,7 @@ type ChannelUnread struct {
 	TeamId       string    `json:"team_id"`
 	ChannelId    string    `json:"channel_id"`
 	MsgCount     int64     `json:"msg_count"`
+	MsgCountRoot int64     `json:"msg_count_root"`
 	MentionCount int64     `json:"mention_count"`
 	NotifyProps  StringMap `json:"-"`
 }
@@ -36,6 +37,7 @@ type ChannelUnreadAt struct {
 	UserId       string    `json:"user_id"`
 	ChannelId    string    `json:"channel_id"`
 	MsgCount     int64     `json:"msg_count"`
+	MsgCountRoot int64     `json:"msg_count_root"`
 	MentionCount int64     `json:"mention_count"`
 	LastViewedAt int64     `json:"last_viewed_at"`
 	NotifyProps  StringMap `json:"-"`
@@ -54,6 +56,7 @@ type ChannelMember struct {
 	SchemeUser    bool      `json:"scheme_user"`
 	SchemeAdmin   bool      `json:"scheme_admin"`
 	ExplicitRoles string    `json:"explicit_roles"`
+	MsgCountRoot  int64     `json:"msg_count_root"`
 }

 type ChannelMembers []ChannelMember
--- a/model/team_member.go
+++ b/model/team_member.go
@@ -33,6 +33,7 @@ type TeamMember struct {
 type TeamUnread struct {
 	TeamId       string `json:"team_id"`
 	MsgCount     int64  `json:"msg_count"`
+	MsgCountRoot int64  `json:"msg_count_root"`
 	MentionCount int64  `json:"mention_count"`
 }

--- a/scripts/mysql-migration-test.sh
+++ b/scripts/mysql-migration-test.sh
@@ -22,9 +22,12 @@ make ARGS="config set SqlSettings.DataSource 'mmuser:mostest@tcp(localhost:3306)
 echo "Setting up fresh db"
 make ARGS="version --config $TMPDIR/config.json" run-cli

-echo "Ignoring known MySQL mismatch: ChannelMembers.SchemeGuest"
-docker exec mattermost-mysql mysql -D migrated -uroot -pmostest -e "ALTER TABLE ChannelMembers DROP COLUMN SchemeGuest;"
-docker exec mattermost-mysql mysql -D latest -uroot -pmostest -e "ALTER TABLE ChannelMembers DROP COLUMN SchemeGuest;"
+for i in "ChannelMembers SchemeGuest" "ChannelMembers MsgCountRoot"; do
+    a=( $i );
+    echo "Ignoring known MySQL mismatch: ${a[0]}.${a[1]}"
+    docker exec mattermost-mysql mysql -D migrated -uroot -pmostest -e "ALTER TABLE ${a[0]} DROP COLUMN ${a[1]};"
+    docker exec mattermost-mysql mysql -D latest -uroot -pmostest -e "ALTER TABLE ${a[0]} DROP COLUMN ${a[1]};"
+done

 echo "Generating dump"
 docker exec mattermost-mysql mysqldump --skip-opt --no-data --compact -u root -pmostest migrated > $DUMPDIR/migrated.sql
--- a/scripts/psql-migration-test.sh
+++ b/scripts/psql-migration-test.sh
@@ -22,6 +22,13 @@ make ARGS="config set SqlSettings.DataSource 'postgres://mmuser:mostest@localhos
 echo "Setting up fresh db"
 make ARGS="version --config $TMPDIR/config.json" run-cli

+for i in "ChannelMembers MsgCountRoot"; do
+    a=( $i );
+    echo "Ignoring known Postgres mismatch: ${a[0]}.${a[1]}"
+    docker exec mattermost-postgres psql -U mmuser -d migrated -c "ALTER TABLE ${a[0]} DROP COLUMN ${a[1]};"
+    docker exec mattermost-postgres psql -U mmuser -d latest -c "ALTER TABLE ${a[0]} DROP COLUMN ${a[1]};"
+done
+
 echo "Generating dump"
 docker exec mattermost-postgres pg_dump --schema-only -d migrated -U mmuser > $DUMPDIR/migrated.sql
 docker exec mattermost-postgres pg_dump --schema-only -d latest -U mmuser > $DUMPDIR/latest.sql
--- a/store/opentracinglayer/opentracinglayer.go
+++ b/store/opentracinglayer/opentracinglayer.go
@@ -625,7 +625,7 @@ func (s *OpenTracingLayerChannelStore) ClearSidebarOnTeamLeave(userId string, te
 	return err
 }

-func (s *OpenTracingLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, error) {
+func (s *OpenTracingLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, int, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "ChannelStore.CountPostsAfter")
 	s.Root.Store.SetContext(newCtx)
@@ -634,13 +634,13 @@ func (s *OpenTracingLayerChannelStore) CountPostsAfter(channelID string, timesta
 	}()

 	defer span.Finish()
-	result, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, userId)
+	result, resultVar1, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, userId)
 	if err != nil {
 		span.LogFields(spanlog.Error(err))
 		ext.Error.Set(span, true)
 	}

-	return result, err
+	return result, resultVar1, err
 }

 func (s *OpenTracingLayerChannelStore) CreateDirectChannel(userId *model.User, otherUserId *model.User) (*model.Channel, error) {
--- a/store/retrylayer/retrylayer.go
+++ b/store/retrylayer/retrylayer.go
@@ -664,21 +664,21 @@ func (s *RetryLayerChannelStore) ClearSidebarOnTeamLeave(userId string, teamID s

 }

-func (s *RetryLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, error) {
+func (s *RetryLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, int, error) {

 	tries := 0
 	for {
-		result, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, userId)
+		result, resultVar1, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, userId)
 		if err == nil {
-			return result, nil
+			return result, resultVar1, nil
 		}
 		if !isRepeatableError(err) {
-			return result, err
+			return result, resultVar1, err
 		}
 		tries++
 		if tries >= 3 {
 			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
-			return result, err
+			return result, resultVar1, err
 		}
 	}

--- a/store/sqlstore/channel_store.go
+++ b/store/sqlstore/channel_store.go
@@ -50,6 +50,7 @@ type channelMember struct {
 	SchemeUser   sql.NullBool
 	SchemeAdmin  sql.NullBool
 	SchemeGuest  sql.NullBool
+	MsgCountRoot int64
 }

 func NewChannelMemberFromModel(cm *model.ChannelMember) *channelMember {
@@ -59,6 +60,7 @@ func NewChannelMemberFromModel(cm *model.ChannelMember) *channelMember {
 		Roles:        cm.ExplicitRoles,
 		LastViewedAt: cm.LastViewedAt,
 		MsgCount:     cm.MsgCount,
+		MsgCountRoot: cm.MsgCountRoot,
 		MentionCount: cm.MentionCount,
 		NotifyProps:  cm.NotifyProps,
 		LastUpdateAt: cm.LastUpdateAt,
@@ -86,10 +88,11 @@ type channelMemberWithSchemeRoles struct {
 	ChannelSchemeDefaultGuestRole sql.NullString
 	ChannelSchemeDefaultUserRole  sql.NullString
 	ChannelSchemeDefaultAdminRole sql.NullString
+	MsgCountRoot                  int64
 }

 func channelMemberSliceColumns() []string {
-	return []string{"ChannelId", "UserId", "Roles", "LastViewedAt", "MsgCount", "MentionCount", "NotifyProps", "LastUpdateAt", "SchemeUser", "SchemeAdmin", "SchemeGuest"}
+	return []string{"ChannelId", "UserId", "Roles", "LastViewedAt", "MsgCount", "MsgCountRoot", "MentionCount", "NotifyProps", "LastUpdateAt", "SchemeUser", "SchemeAdmin", "SchemeGuest"}
 }

 func channelMemberToSlice(member *model.ChannelMember) []interface{} {
@@ -99,6 +102,7 @@ func channelMemberToSlice(member *model.ChannelMember) []interface{} {
 	resultSlice = append(resultSlice, member.ExplicitRoles)
 	resultSlice = append(resultSlice, member.LastViewedAt)
 	resultSlice = append(resultSlice, member.MsgCount)
+	resultSlice = append(resultSlice, member.MsgCountRoot)
 	resultSlice = append(resultSlice, member.MentionCount)
 	resultSlice = append(resultSlice, model.MapToJson(member.NotifyProps))
 	resultSlice = append(resultSlice, member.LastUpdateAt)
@@ -230,6 +234,7 @@ func (db channelMemberWithSchemeRoles) ToModel() *model.ChannelMember {
 		Roles:         strings.Join(rolesResult.roles, " "),
 		LastViewedAt:  db.LastViewedAt,
 		MsgCount:      db.MsgCount,
+		MsgCountRoot:  db.MsgCountRoot,
 		MentionCount:  db.MentionCount,
 		NotifyProps:   db.NotifyProps,
 		LastUpdateAt:  db.LastUpdateAt,
@@ -712,7 +717,10 @@ func (s SqlChannelStore) GetChannelUnread(channelId, userId string) (*model.Chan
 	var unreadChannel model.ChannelUnread
 	err := s.GetReplica().SelectOne(&unreadChannel,
 		`SELECT
-				Channels.TeamId TeamId, Channels.Id ChannelId, (Channels.TotalMsgCount - ChannelMembers.MsgCount) MsgCount, ChannelMembers.MentionCount MentionCount, ChannelMembers.NotifyProps NotifyProps
+				Channels.TeamId TeamId, Channels.Id ChannelId,
+				(Channels.TotalMsgCount - ChannelMembers.MsgCount) MsgCount,
+				(Channels.TotalMsgCountRoot - ChannelMembers.MsgCountRoot) MsgCountRoot,
+				ChannelMembers.MentionCount MentionCount, ChannelMembers.NotifyProps NotifyProps
 			FROM
 				Channels, ChannelMembers
 			WHERE
@@ -1181,23 +1189,25 @@ func (s SqlChannelStore) GetPublicChannelsByIdsForTeam(teamId string, channelIds
 }

 type channelIdWithCountAndUpdateAt struct {
-	Id            string
-	TotalMsgCount int64
-	UpdateAt      int64
+	Id                string
+	TotalMsgCount     int64
+	TotalMsgCountRoot int64
+	UpdateAt          int64
 }

 func (s SqlChannelStore) GetChannelCounts(teamId string, userId string) (*model.ChannelCounts, error) {
 	var data []channelIdWithCountAndUpdateAt
-	_, err := s.GetReplica().Select(&data, "SELECT Id, TotalMsgCount, UpdateAt FROM Channels WHERE Id IN (SELECT ChannelId FROM ChannelMembers WHERE UserId = :UserId) AND (TeamId = :TeamId OR TeamId = '') AND DeleteAt = 0 ORDER BY DisplayName", map[string]interface{}{"TeamId": teamId, "UserId": userId})
+	_, err := s.GetReplica().Select(&data, "SELECT Id, TotalMsgCount, TotalMsgCountRoot, UpdateAt FROM Channels WHERE Id IN (SELECT ChannelId FROM ChannelMembers WHERE UserId = :UserId) AND (TeamId = :TeamId OR TeamId = '') AND DeleteAt = 0 ORDER BY DisplayName", map[string]interface{}{"TeamId": teamId, "UserId": userId})

 	if err != nil {
 		return nil, errors.Wrapf(err, "failed to get channels count with teamId=%s and userId=%s", teamId, userId)
 	}

-	counts := &model.ChannelCounts{Counts: make(map[string]int64), UpdateTimes: make(map[string]int64)}
+	counts := &model.ChannelCounts{Counts: make(map[string]int64), CountsRoot: make(map[string]int64), UpdateTimes: make(map[string]int64)}
 	for i := range data {
 		v := data[i]
 		counts.Counts[v.Id] = v.TotalMsgCount
+		counts.CountsRoot[v.Id] = v.TotalMsgCountRoot
 		counts.UpdateTimes[v.Id] = v.UpdateAt
 	}

@@ -2061,12 +2071,13 @@ func (s SqlChannelStore) UpdateLastViewedAt(channelIds []string, userId string,
 	props["UserId"] = userId

 	var lastPostAtTimes []struct {
-		Id            string
-		LastPostAt    int64
-		TotalMsgCount int64
+		Id                string
+		LastPostAt        int64
+		TotalMsgCount     int64
+		TotalMsgCountRoot int64
 	}

-	query := `SELECT Id, LastPostAt, TotalMsgCount FROM Channels WHERE Id IN ` + keys
+	query := `SELECT Id, LastPostAt, TotalMsgCount, TotalMsgCountRoot FROM Channels WHERE Id IN ` + keys
 	// TODO: use a CTE for mysql too when version 8 becomes the minimum supported version.
 	if s.DriverName() == model.DATABASE_DRIVER_POSTGRES {
 		query = `WITH c AS ( ` + query + `),
@@ -2076,6 +2087,7 @@ func (s SqlChannelStore) UpdateLastViewedAt(channelIds []string, userId string,
 	SET
 		MentionCount = 0,
 		MsgCount = greatest(cm.MsgCount, c.TotalMsgCount),
+		MsgCountRoot = greatest(cm.MsgCountRoot, c.TotalMsgCountRoot),
 		LastViewedAt = greatest(cm.LastViewedAt, c.LastPostAt),
 		LastUpdateAt = greatest(cm.LastViewedAt, c.LastPostAt)
 	FROM c
@@ -2106,6 +2118,7 @@ func (s SqlChannelStore) UpdateLastViewedAt(channelIds []string, userId string,
 	}

 	msgCountQuery := ""
+	msgCountQueryRoot := ""
 	lastViewedQuery := ""

 	for index, t := range lastPostAtTimes {
@@ -2114,6 +2127,9 @@ func (s SqlChannelStore) UpdateLastViewedAt(channelIds []string, userId string,
 		props["msgCount"+strconv.Itoa(index)] = t.TotalMsgCount
 		msgCountQuery += fmt.Sprintf("WHEN :channelId%d THEN GREATEST(MsgCount, :msgCount%d) ", index, index)

+		props["msgCountRoot"+strconv.Itoa(index)] = t.TotalMsgCountRoot
+		msgCountQueryRoot += fmt.Sprintf("WHEN :channelId%d THEN GREATEST(MsgCountRoot, :msgCountRoot%d) ", index, index)
+
 		props["lastViewed"+strconv.Itoa(index)] = t.LastPostAt
 		lastViewedQuery += fmt.Sprintf("WHEN :channelId%d THEN GREATEST(LastViewedAt, :lastViewed%d) ", index, index)

@@ -2125,6 +2141,7 @@ func (s SqlChannelStore) UpdateLastViewedAt(channelIds []string, userId string,
 		SET
 			MentionCount = 0,
 			MsgCount = CASE ChannelId ` + msgCountQuery + ` END,
+			MsgCountRoot = CASE ChannelId ` + msgCountQueryRoot + ` END,
 			LastViewedAt = CASE ChannelId ` + lastViewedQuery + ` END,
 			LastUpdateAt = LastViewedAt
 		WHERE
@@ -2142,8 +2159,8 @@ func (s SqlChannelStore) UpdateLastViewedAt(channelIds []string, userId string,
 }

 // CountPostsAfter returns the number of posts in the given channel created after but not including the given timestamp. If given a non-empty user ID, only counts posts made by that user.
-func (s SqlChannelStore) CountPostsAfter(channelId string, timestamp int64, userId string) (int, error) {
-	joinLeavePostTypes, params := MapStringsToQueryParams([]string{
+func (s SqlChannelStore) CountPostsAfter(channelId string, timestamp int64, userId string) (int, int, error) {
+	joinLeavePostTypes := []string{
 		// These types correspond to the ones checked by Post.IsJoinLeaveMessage
 		model.POST_JOIN_LEAVE,
 		model.POST_ADD_REMOVE,
@@ -2155,31 +2172,25 @@ func (s SqlChannelStore) CountPostsAfter(channelId string, timestamp int64, user
 		model.POST_REMOVE_FROM_CHANNEL,
 		model.POST_ADD_TO_TEAM,
 		model.POST_REMOVE_FROM_TEAM,
-	}, "PostType")
-
-	query := `
-	SELECT count(*)
-	FROM Posts
-	WHERE
-		ChannelId = :ChannelId
-		AND CreateAt > :CreateAt
-		AND Type NOT IN ` + joinLeavePostTypes + `
-		AND DeleteAt = 0
-	`
-
-	params["ChannelId"] = channelId
-	params["CreateAt"] = timestamp
+	}
+	query := s.getQueryBuilder().Select("count(*)").From("Posts").Where(sq.Eq{"ChannelId": channelId}).Where(sq.Gt{"CreateAt": timestamp}).Where(sq.NotEq{"Type": joinLeavePostTypes}).Where(sq.Eq{"DeleteAt": 0})

 	if userId != "" {
-		query += " AND UserId = :UserId"
-		params["UserId"] = userId
+		query = query.Where(sq.Eq{"UserId": userId})
 	}
+	sql, args, _ := query.ToSql()

-	unread, err := s.GetReplica().SelectInt(query, params)
+	unread, err := s.GetReplica().SelectInt(sql, args...)
 	if err != nil {
-		return 0, errors.Wrap(err, "failed to count Posts")
+		return 0, 0, errors.Wrap(err, "failed to count Posts")
 	}
-	return int(unread), nil
+	sql2, args2, _ := query.Where(sq.Eq{"RootId": ""}).ToSql()
+
+	unreadRoot, err := s.GetReplica().SelectInt(sql2, args2...)
+	if err != nil {
+		return 0, 0, errors.Wrap(err, "failed to count root Posts")
+	}
+	return int(unread), int(unreadRoot), nil
 }

 // UpdateLastViewedAtPost updates a ChannelMember as if the user last read the channel at the time of the given post.
@@ -2196,18 +2207,19 @@ func (s SqlChannelStore) UpdateLastViewedAtPost(unreadPost *model.Post, userID s
 		}
 	}

-	unread, err := s.CountPostsAfter(unreadPost.ChannelId, unreadDate, "")
+	unread, unreadRoot, err := s.CountPostsAfter(unreadPost.ChannelId, unreadDate, "")
 	if err != nil {
 		return nil, err
 	}

 	params := map[string]interface{}{
-		"mentions":     mentionCount,
-		"unreadCount":  unread,
-		"lastViewedAt": unreadDate,
-		"userId":       userID,
-		"channelId":    unreadPost.ChannelId,
-		"updatedAt":    model.GetMillis(),
+		"mentions":        mentionCount,
+		"unreadCount":     unread,
+		"unreadCountRoot": unreadRoot,
+		"lastViewedAt":    unreadDate,
+		"userId":          userID,
+		"channelId":       unreadPost.ChannelId,
+		"updatedAt":       model.GetMillis(),
 	}

 	// msg count uses the value from channels to prevent counting on older channels where no. of messages can be high.
@@ -2218,6 +2230,7 @@ func (s SqlChannelStore) UpdateLastViewedAtPost(unreadPost *model.Post, userID s
 	SET
 		MentionCount = :mentions,
 		MsgCount = (SELECT TotalMsgCount FROM Channels WHERE ID = :channelId) - :unreadCount,
+		MsgCountRoot = (SELECT TotalMsgCountRoot FROM Channels WHERE ID = :channelId) - :unreadCountRoot,
 		LastViewedAt = :lastViewedAt,
 		LastUpdateAt = :updatedAt
 	WHERE
@@ -2235,6 +2248,7 @@ func (s SqlChannelStore) UpdateLastViewedAtPost(unreadPost *model.Post, userID s
 		cm.UserId UserId,
 		cm.ChannelId ChannelId,
 		cm.MsgCount MsgCount,
+		cm.MsgCountRoot MsgCountRoot,
 		cm.MentionCount MentionCount,
 		cm.LastViewedAt LastViewedAt,
 		cm.NotifyProps NotifyProps
--- a/store/sqlstore/group_store.go
+++ b/store/sqlstore/group_store.go
@@ -917,6 +917,7 @@ func (s *SqlGroupStore) ChannelMembersToRemove(channelID *string) ([]*model.Chan
 		"ChannelMembers.UserId",
 		"ChannelMembers.LastViewedAt",
 		"ChannelMembers.MsgCount",
+		"ChannelMembers.MsgCountRoot",
 		"ChannelMembers.MentionCount",
 		"ChannelMembers.NotifyProps",
 		"ChannelMembers.LastUpdateAt",
--- a/store/sqlstore/post_store.go
+++ b/store/sqlstore/post_store.go
@@ -112,6 +112,7 @@ func (s *SqlPostStore) createIndexesIfNotExists() {

 func (s *SqlPostStore) SaveMultiple(posts []*model.Post) ([]*model.Post, int, error) {
 	channelNewPosts := make(map[string]int)
+	channelNewRootPosts := make(map[string]int)
 	maxDateNewPosts := make(map[string]int64)
 	rootIds := make(map[string]int)
 	maxDateRootIds := make(map[string]int64)
@@ -125,8 +126,7 @@ func (s *SqlPostStore) SaveMultiple(posts []*model.Post) ([]*model.Post, int, er
 			return nil, idx, err
 		}

-		currentChannelCount, ok := channelNewPosts[post.ChannelId]
-		if !ok {
+		if currentChannelCount, ok := channelNewPosts[post.ChannelId]; !ok {
 			if post.IsJoinLeaveMessage() {
 				channelNewPosts[post.ChannelId] = 0
 			} else {
@@ -143,11 +143,21 @@ func (s *SqlPostStore) SaveMultiple(posts []*model.Post) ([]*model.Post, int, er
 		}

 		if post.RootId == "" {
+			if currentChannelCount, ok := channelNewRootPosts[post.ChannelId]; !ok {
+				if post.IsJoinLeaveMessage() {
+					channelNewRootPosts[post.ChannelId] = 0
+				} else {
+					channelNewRootPosts[post.ChannelId] = 1
+				}
+			} else {
+				if !post.IsJoinLeaveMessage() {
+					channelNewRootPosts[post.ChannelId] = currentChannelCount + 1
+				}
+			}
 			continue
 		}

-		currentRootCount, ok := rootIds[post.RootId]
-		if !ok {
+		if currentRootCount, ok := rootIds[post.RootId]; !ok {
 			rootIds[post.RootId] = 1
 			maxDateRootIds[post.RootId] = post.CreateAt
 		} else {
@@ -188,7 +198,9 @@ func (s *SqlPostStore) SaveMultiple(posts []*model.Post) ([]*model.Post, int, er
 	}

 	for channelId, count := range channelNewPosts {
-		if _, err = s.GetMaster().Exec("UPDATE Channels SET LastPostAt = GREATEST(:LastPostAt, LastPostAt), TotalMsgCount = TotalMsgCount + :Count WHERE Id = :ChannelId", map[string]interface{}{"LastPostAt": maxDateNewPosts[channelId], "ChannelId": channelId, "Count": count}); err != nil {
+		countRoot := channelNewRootPosts[channelId]
+
+		if _, err = s.GetMaster().Exec("UPDATE Channels SET LastPostAt = GREATEST(:LastPostAt, LastPostAt), TotalMsgCount = TotalMsgCount + :Count, TotalMsgCountRoot = TotalMsgCountRoot + :CountRoot WHERE Id = :ChannelId", map[string]interface{}{"LastPostAt": maxDateNewPosts[channelId], "ChannelId": channelId, "Count": count, "CountRoot": countRoot}); err != nil {
 			mlog.Warn("Error updating Channel LastPostAt.", mlog.Err(err))
 		}
 	}
--- a/store/sqlstore/team_store.go
+++ b/store/sqlstore/team_store.go
@@ -1177,7 +1177,7 @@ func (s SqlTeamStore) GetTeamsForUserWithPagination(userId string, page, perPage
 // for all the channels in all the teams except the excluded ones.
 func (s SqlTeamStore) GetChannelUnreadsForAllTeams(excludeTeamId, userId string) ([]*model.ChannelUnread, error) {
 	query, args, err := s.getQueryBuilder().
-		Select("Channels.TeamId TeamId", "Channels.Id ChannelId", "(Channels.TotalMsgCount - ChannelMembers.MsgCount) MsgCount", "ChannelMembers.MentionCount MentionCount", "ChannelMembers.NotifyProps NotifyProps").
+		Select("Channels.TeamId TeamId", "Channels.Id ChannelId", "(Channels.TotalMsgCount - ChannelMembers.MsgCount) MsgCount", "(Channels.TotalMsgCountRoot - ChannelMembers.MsgCountRoot) MsgCountRoot", "ChannelMembers.MentionCount MentionCount", "ChannelMembers.NotifyProps NotifyProps").
 		From("Channels").
 		Join("ChannelMembers ON Id = ChannelId").
 		Where(sq.Eq{"UserId": userId, "DeleteAt": 0}).
@@ -1199,7 +1199,7 @@ func (s SqlTeamStore) GetChannelUnreadsForAllTeams(excludeTeamId, userId string)
 // GetChannelUnreadsForTeam returns unreads msg count, mention counts and notifyProps for all the channels in a single team.
 func (s SqlTeamStore) GetChannelUnreadsForTeam(teamId, userId string) ([]*model.ChannelUnread, error) {
 	query, args, err := s.getQueryBuilder().
-		Select("Channels.TeamId TeamId", "Channels.Id ChannelId", "(Channels.TotalMsgCount - ChannelMembers.MsgCount) MsgCount", "ChannelMembers.MentionCount MentionCount", "ChannelMembers.NotifyProps NotifyProps").
+		Select("Channels.TeamId TeamId", "Channels.Id ChannelId", "(Channels.TotalMsgCount - ChannelMembers.MsgCount) MsgCount", "(Channels.TotalMsgCountRoot - ChannelMembers.MsgCountRoot) MsgCountRoot", "ChannelMembers.MentionCount MentionCount", "ChannelMembers.NotifyProps NotifyProps").
 		From("Channels").
 		Join("ChannelMembers ON Id = ChannelId").
 		Where(sq.Eq{"UserId": userId, "TeamId": teamId, "DeleteAt": 0}).ToSql()
--- a/store/sqlstore/upgrade.go
+++ b/store/sqlstore/upgrade.go
@@ -1011,6 +1011,57 @@ func upgradeDatabaseToVersion535(sqlStore *SqlStore) {

 	sqlStore.CreateColumnIfNotExists("SidebarCategories", "Collapsed", "tinyint(1)", "boolean", "0")

+	sqlStore.CreateColumnIfNotExistsNoDefault("Channels", "TotalMsgCountRoot", "bigint", "bigint")
+	sqlStore.CreateColumnIfNotExistsNoDefault("Channels", "LastRootPostAt", "bigint", "bigint")
+	defer sqlStore.RemoveColumnIfExists("Channels", "LastRootPostAt")
+
+	// note: setting default 0 on pre-5.0 tables causes test-db-migration script to fail, so this column will be added to ignore list
+	sqlStore.CreateColumnIfNotExists("ChannelMembers", "MsgCountRoot", "bigint", "bigint", "0")
+	sqlStore.AlterColumnDefaultIfExists("ChannelMembers", "MsgCountRoot", model.NewString("0"), model.NewString("0"))
+
+	forceIndex := ""
+	if sqlStore.DriverName() == model.DATABASE_DRIVER_MYSQL {
+		forceIndex = "FORCE INDEX(idx_posts_channel_id)"
+	}
+	totalMsgCountRootCTE := `
+		SELECT Channels.Id channelid, COALESCE(COUNT(*),0) newcount, COALESCE(MAX(Posts.CreateAt), 0) as lastpost
+		FROM Channels
+		LEFT JOIN Posts ` + forceIndex + ` ON Channels.Id = Posts.ChannelId
+		WHERE Posts.RootId = ''
+		GROUP BY Channels.Id
+	`
+	channelsCTE := "SELECT TotalMsgCountRoot, Id, LastRootPostAt from Channels"
+	updateChannels := `
+		WITH q AS (` + totalMsgCountRootCTE + `)
+		UPDATE Channels SET TotalMsgCountRoot = q.newcount, LastRootPostAt=q.lastpost
+		FROM q where q.channelid=Channels.Id;
+	`
+	updateChannelMembers := `
+		WITH q as (` + channelsCTE + `)
+		UPDATE ChannelMembers CM SET MsgCountRoot=TotalMsgCountRoot
+		FROM q WHERE q.id=CM.ChannelId AND LastViewedAt >= q.lastrootpostat;
+	`
+	if sqlStore.DriverName() == model.DATABASE_DRIVER_MYSQL {
+		updateChannels = `
+			UPDATE Channels
+			INNER Join (` + totalMsgCountRootCTE + `) as q
+			ON q.channelid=Channels.Id
+			SET TotalMsgCountRoot = q.newcount, LastRootPostAt=q.lastpost;
+		`
+		updateChannelMembers = `
+			UPDATE ChannelMembers CM
+			INNER JOIN (` + channelsCTE + `) as q
+			ON q.id=CM.ChannelId and LastViewedAt >= q.lastrootpostat
+			SET MsgCountRoot=TotalMsgCountRoot
+			`
+	}
+	if _, err := sqlStore.GetMaster().Exec(updateChannels); err != nil {
+		mlog.Error("Error updating Channels table", mlog.Err(err))
+	}
+	if _, err := sqlStore.GetMaster().Exec(updateChannelMembers); err != nil {
+		mlog.Error("Error updating ChannelMembers table", mlog.Err(err))
+	}
+
 	// 	saveSchemaVersion(sqlStore, Version5350)
 	// }
 }
--- a/store/sqlstore/upgrade_test.go
+++ b/store/sqlstore/upgrade_test.go
@@ -6,8 +6,10 @@ package sqlstore
 import (
 	"testing"

+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"

+	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/store"
 )

@@ -103,3 +105,139 @@ func TestSaveSchemaVersion(t *testing.T) {
 		})
 	})
 }
+func createChannelMemberWithLastViewAt(ss store.Store, channelId, userId string, lastViewAt int64) *model.ChannelMember {
+	m := model.ChannelMember{}
+	m.ChannelId = channelId
+	m.UserId = userId
+	m.LastViewedAt = lastViewAt
+	m.NotifyProps = model.GetDefaultChannelNotifyProps()
+	cm, _ := ss.Channel().SaveMember(&m)
+	return cm
+}
+func createPostWithTimestamp(ss store.Store, channelId, userId, rootId, parentId string, timestamp int64) *model.Post {
+	m := model.Post{}
+	m.CreateAt = timestamp
+	m.ChannelId = channelId
+	m.UserId = userId
+	m.RootId = rootId
+	m.ParentId = parentId
+	m.Message = "zz" + model.NewId() + "b"
+	p, _ := ss.Post().Save(&m)
+	return p
+}
+
+func createChannelWithLastPostAt(ss store.Store, teamId, creatorId string, lastPostAt, msgCount, rootCount int64) (*model.Channel, error) {
+	m := model.Channel{}
+	m.TeamId = teamId
+	m.TotalMsgCount = msgCount
+	m.TotalMsgCountRoot = rootCount
+	m.LastPostAt = lastPostAt
+	m.CreatorId = creatorId
+	m.DisplayName = "Name"
+	m.Name = "zz" + model.NewId() + "b"
+	m.Type = model.CHANNEL_OPEN
+	return ss.Channel().Save(&m, -1)
+}
+func TestMsgCountRootMigration(t *testing.T) {
+	type TestCaseChannel struct {
+		Name                           string
+		PostTimes                      []int64
+		ReplyTimes                     []int64
+		MembershipsLastViewAt          []int64
+		ExpectedMembershipMsgCountRoot []int64
+	}
+	type TestTableEntry struct {
+		name string
+		data []TestCaseChannel
+	}
+	testTable := []TestTableEntry{
+		{
+			name: "test1",
+			data: []TestCaseChannel{
+				{
+					Name:                           "channel with one post",
+					PostTimes:                      []int64{1000},
+					ReplyTimes:                     []int64{0},
+					MembershipsLastViewAt:          []int64{1},
+					ExpectedMembershipMsgCountRoot: []int64{0},
+				},
+				{
+					Name:                           "channel with one post, read",
+					PostTimes:                      []int64{1000},
+					ReplyTimes:                     []int64{0},
+					MembershipsLastViewAt:          []int64{1000},
+					ExpectedMembershipMsgCountRoot: []int64{1},
+				},
+				{
+					Name:                           "with one reply, viewed after 2nd root",
+					PostTimes:                      []int64{1000, 2000, 3000, 4000},
+					ReplyTimes:                     []int64{1001, 0, 0, 0},
+					MembershipsLastViewAt:          []int64{2001},
+					ExpectedMembershipMsgCountRoot: []int64{0},
+				},
+				{
+					Name:                           "two replies, 3 memberships",
+					PostTimes:                      []int64{1000, 2000, 3000},
+					ReplyTimes:                     []int64{1001, 2001, 0},
+					MembershipsLastViewAt:          []int64{2000, 5000, 0},
+					ExpectedMembershipMsgCountRoot: []int64{0, 3, 0},
+				},
+			},
+		},
+	}
+	for _, testCase := range testTable {
+		t.Run(testCase.name, func(t *testing.T) {
+			StoreTest(t, func(t *testing.T, ss store.Store) {
+				sqlStore := ss.(*SqlStore)
+				team := createTeam(ss)
+				for _, testChannel := range testCase.data {
+					t.Run(testChannel.Name, func(t *testing.T) {
+						lastPostAt := int64(0)
+						for i := range testChannel.PostTimes {
+							if testChannel.PostTimes[i] > lastPostAt {
+								lastPostAt = testChannel.PostTimes[i]
+							}
+							if testChannel.ReplyTimes[i] > lastPostAt {
+								lastPostAt = testChannel.ReplyTimes[i]
+							}
+						}
+						channel, err := createChannelWithLastPostAt(ss, team.Id, model.NewId(), lastPostAt, int64(len(testChannel.PostTimes)+len(testChannel.ReplyTimes)), int64(len(testChannel.PostTimes)))
+						require.NoError(t, err)
+						var userIds []string
+						for _, md := range testChannel.MembershipsLastViewAt {
+							user := createUser(ss)
+							userIds = append(userIds, user.Id)
+							require.NotNil(t, user)
+							cm := createChannelMemberWithLastViewAt(ss, channel.Id, user.Id, md)
+							require.NotNil(t, cm)
+						}
+						for i, pt := range testChannel.PostTimes {
+							rt := testChannel.ReplyTimes[i]
+							post := createPostWithTimestamp(ss, channel.Id, model.NewId(), "", "", pt)
+							require.NotNil(t, post)
+							if rt > 0 {
+								reply := createPostWithTimestamp(ss, channel.Id, model.NewId(), post.Id, post.Id, rt)
+								require.NotNil(t, reply)
+							}
+						}
+
+						upgradeDatabaseToVersion535(sqlStore)
+
+						members, err := ss.Channel().GetMembersByIds(channel.Id, userIds)
+						require.NoError(t, err)
+
+						for _, m := range *members {
+							for i, uid := range userIds {
+								if m.UserId == uid {
+									assert.Equal(t, testChannel.ExpectedMembershipMsgCountRoot[i], m.MsgCountRoot)
+									break
+								}
+							}
+						}
+
+					})
+				}
+			})
+		})
+	}
+}
--- a/store/store.go
+++ b/store/store.go
@@ -194,7 +194,7 @@ type ChannelStore interface {
 	PermanentDeleteMembersByChannel(channelID string) error
 	UpdateLastViewedAt(channelIds []string, userId string, updateThreads bool) (map[string]int64, error)
 	UpdateLastViewedAtPost(unreadPost *model.Post, userID string, mentionCount int, updateThreads bool) (*model.ChannelUnreadAt, error)
-	CountPostsAfter(channelID string, timestamp int64, userId string) (int, error)
+	CountPostsAfter(channelID string, timestamp int64, userId string) (int, int, error)
 	IncrementMentionCount(channelID string, userId string, updateThreads bool) error
 	AnalyticsTypeCount(teamID string, channelType string) (int64, error)
 	GetMembersForUser(teamID string, userId string) (*model.ChannelMembers, error)
--- a/store/storetest/channel_store.go
+++ b/store/storetest/channel_store.go
@@ -327,20 +327,20 @@ func testGetChannelUnread(t *testing.T, ss store.Store) {
 	notifyPropsModel := model.GetDefaultChannelNotifyProps()

 	// Setup Channel 1
-	c1 := &model.Channel{TeamId: m1.TeamId, Name: model.NewId(), DisplayName: "Downtown", Type: model.CHANNEL_OPEN, TotalMsgCount: 100}
+	c1 := &model.Channel{TeamId: m1.TeamId, Name: model.NewId(), DisplayName: "Downtown", Type: model.CHANNEL_OPEN, TotalMsgCount: 100, TotalMsgCountRoot: 99}
 	_, nErr = ss.Channel().Save(c1, -1)
 	require.NoError(t, nErr)

-	cm1 := &model.ChannelMember{ChannelId: c1.Id, UserId: m1.UserId, NotifyProps: notifyPropsModel, MsgCount: 90}
+	cm1 := &model.ChannelMember{ChannelId: c1.Id, UserId: m1.UserId, NotifyProps: notifyPropsModel, MsgCount: 90, MsgCountRoot: 80}
 	_, err := ss.Channel().SaveMember(cm1)
 	require.NoError(t, err)

 	// Setup Channel 2
-	c2 := &model.Channel{TeamId: m2.TeamId, Name: model.NewId(), DisplayName: "Cultural", Type: model.CHANNEL_OPEN, TotalMsgCount: 100}
+	c2 := &model.Channel{TeamId: m2.TeamId, Name: model.NewId(), DisplayName: "Cultural", Type: model.CHANNEL_OPEN, TotalMsgCount: 100, TotalMsgCountRoot: 100}
 	_, nErr = ss.Channel().Save(c2, -1)
 	require.NoError(t, nErr)

-	cm2 := &model.ChannelMember{ChannelId: c2.Id, UserId: m2.UserId, NotifyProps: notifyPropsModel, MsgCount: 90, MentionCount: 5}
+	cm2 := &model.ChannelMember{ChannelId: c2.Id, UserId: m2.UserId, NotifyProps: notifyPropsModel, MsgCount: 90, MsgCountRoot: 90, MentionCount: 5}
 	_, err = ss.Channel().SaveMember(cm2)
 	require.NoError(t, err)

@@ -353,7 +353,7 @@ func testGetChannelUnread(t *testing.T, ss store.Store) {
 	require.NotNil(t, ch.NotifyProps, "wrong props for channel 1")
 	require.EqualValues(t, 0, ch.MentionCount, "wrong MentionCount for channel 1")
 	require.EqualValues(t, 10, ch.MsgCount, "wrong MsgCount for channel 1")
-
+	require.EqualValues(t, 19, ch.MsgCountRoot, "wrong MsgCountRoot for channel 1")
 	// Check for Channel 2
 	ch2, nErr := ss.Channel().GetChannelUnread(c2.Id, uid)

@@ -4007,19 +4007,19 @@ func testCountPostsAfter(t *testing.T, ss store.Store) {
 		})
 		require.NoError(t, err)

-		count, err := ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, "")
+		count, _, err := ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, "")
 		require.NoError(t, err)
 		assert.Equal(t, 3, count)

-		count, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, "")
+		count, _, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, "")
 		require.NoError(t, err)
 		assert.Equal(t, 2, count)

-		count, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, userId1)
+		count, _, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, userId1)
 		require.NoError(t, err)
 		assert.Equal(t, 2, count)

-		count, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, userId1)
+		count, _, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, userId1)
 		require.NoError(t, err)
 		assert.Equal(t, 1, count)
 	})
@@ -4044,11 +4044,11 @@ func testCountPostsAfter(t *testing.T, ss store.Store) {
 		})
 		require.NoError(t, err)

-		count, err := ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, "")
+		count, _, err := ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, "")
 		require.NoError(t, err)
 		assert.Equal(t, 1, count)

-		count, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, "")
+		count, _, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, "")
 		require.NoError(t, err)
 		assert.Equal(t, 0, count)
 	})
@@ -4105,19 +4105,19 @@ func testCountPostsAfter(t *testing.T, ss store.Store) {
 		})
 		require.NoError(t, err)

-		count, err := ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, "")
+		count, _, err := ss.Channel().CountPostsAfter(channelId, p1.CreateAt-1, "")
 		require.NoError(t, err)
 		assert.Equal(t, 3, count)

-		count, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, "")
+		count, _, err = ss.Channel().CountPostsAfter(channelId, p1.CreateAt, "")
 		require.NoError(t, err)
 		assert.Equal(t, 2, count)

-		count, err = ss.Channel().CountPostsAfter(channelId, p5.CreateAt-1, "")
+		count, _, err = ss.Channel().CountPostsAfter(channelId, p5.CreateAt-1, "")
 		require.NoError(t, err)
 		assert.Equal(t, 2, count)

-		count, err = ss.Channel().CountPostsAfter(channelId, p5.CreateAt, "")
+		count, _, err = ss.Channel().CountPostsAfter(channelId, p5.CreateAt, "")
 		require.NoError(t, err)
 		assert.Equal(t, 1, count)
 	})
@@ -6345,9 +6345,9 @@ func testMaterializedPublicChannels(t *testing.T, ss store.Store, s SqlStore) {

 	_, execerr = s.GetMaster().ExecNoTimeout(`
 		INSERT INTO
-		    Channels(Id, CreateAt, UpdateAt, DeleteAt, TeamId, Type, DisplayName, Name, Header, Purpose, LastPostAt, TotalMsgCount, ExtraUpdateAt, CreatorId)
+		    Channels(Id, CreateAt, UpdateAt, DeleteAt, TeamId, Type, DisplayName, Name, Header, Purpose, LastPostAt, TotalMsgCount, ExtraUpdateAt, CreatorId, TotalMsgCountRoot)
 		VALUES
-		    (:Id, :CreateAt, :UpdateAt, :DeleteAt, :TeamId, :Type, :DisplayName, :Name, :Header, :Purpose, :LastPostAt, :TotalMsgCount, :ExtraUpdateAt, :CreatorId);
+		    (:Id, :CreateAt, :UpdateAt, :DeleteAt, :TeamId, :Type, :DisplayName, :Name, :Header, :Purpose, :LastPostAt, :TotalMsgCount, :ExtraUpdateAt, :CreatorId, 0);
 	`, map[string]interface{}{
 		"Id":            o3.Id,
 		"CreateAt":      o3.CreateAt,
--- a/store/storetest/mocks/ChannelStore.go
+++ b/store/storetest/mocks/ChannelStore.go
@@ -140,7 +140,7 @@ func (_m *ChannelStore) ClearSidebarOnTeamLeave(userId string, teamID string) er
 }

 // CountPostsAfter provides a mock function with given fields: channelID, timestamp, userId
-func (_m *ChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, error) {
+func (_m *ChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, int, error) {
 	ret := _m.Called(channelID, timestamp, userId)

 	var r0 int
@@ -150,14 +150,21 @@ func (_m *ChannelStore) CountPostsAfter(channelID string, timestamp int64, userI
 		r0 = ret.Get(0).(int)
 	}

-	var r1 error
-	if rf, ok := ret.Get(1).(func(string, int64, string) error); ok {
+	var r1 int
+	if rf, ok := ret.Get(1).(func(string, int64, string) int); ok {
 		r1 = rf(channelID, timestamp, userId)
 	} else {
-		r1 = ret.Error(1)
+		r1 = ret.Get(1).(int)
 	}

-	return r0, r1
+	var r2 error
+	if rf, ok := ret.Get(2).(func(string, int64, string) error); ok {
+		r2 = rf(channelID, timestamp, userId)
+	} else {
+		r2 = ret.Error(2)
+	}
+
+	return r0, r1, r2
 }

 // CreateDirectChannel provides a mock function with given fields: userId, otherUserId
--- a/store/timerlayer/timerlayer.go
+++ b/store/timerlayer/timerlayer.go
@@ -599,10 +599,10 @@ func (s *TimerLayerChannelStore) ClearSidebarOnTeamLeave(userId string, teamID s
 	return err
 }

-func (s *TimerLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, error) {
+func (s *TimerLayerChannelStore) CountPostsAfter(channelID string, timestamp int64, userId string) (int, int, error) {
 	start := timemodule.Now()

-	result, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, userId)
+	result, resultVar1, err := s.ChannelStore.CountPostsAfter(channelID, timestamp, userId)

 	elapsed := float64(timemodule.Since(start)) / float64(timemodule.Second)
 	if s.Root.Metrics != nil {
@@ -612,7 +612,7 @@ func (s *TimerLayerChannelStore) CountPostsAfter(channelID string, timestamp int
 		}
 		s.Root.Metrics.ObserveStoreMethodDuration("ChannelStore.CountPostsAfter", success, elapsed)
 	}
-	return result, err
+	return result, resultVar1, err
 }

 func (s *TimerLayerChannelStore) CreateDirectChannel(userId *model.User, otherUserId *model.User) (*model.Channel, error) {