[MM-56398] Fix date range query for user reporting (mattermost#25960)

* [MM-56398] Fix date range query for user reporting

* Missing debug stuff

* Fix tests

server/channels/api4/report.go

@@ -89,7 +89,7 @@ func fillReportingBaseOptions(values url.Values) model.ReportingBaseOptions {
 		pageSize = int(pageSizeStr)
 	}
 
-	return model.ReportingBaseOptions{
+	options := model.ReportingBaseOptions{
 		Direction:       direction,
 		SortColumn:      sortColumn,
 		SortDesc:        values.Get("sort_direction") == "desc",
@@ -98,6 +98,8 @@ func fillReportingBaseOptions(values url.Values) model.ReportingBaseOptions {
 		FromId:          values.Get("from_id"),
 		DateRange:       values.Get("date_range"),
 	}
+	options.PopulateDateRange(time.Now())
+	return options
 }
 
 func fillUserReportOptions(values url.Values) (*model.UserReportOptions, *model.AppError) {
@@ -112,15 +114,13 @@ func fillUserReportOptions(values url.Values) (*model.UserReportOptions, *model.
 		return nil, model.NewAppError("getUsersForReporting", "api.getUsersForReporting.invalid_active_filter", nil, "", http.StatusBadRequest)
 	}
 
-	options := &model.UserReportOptions{
+	return &model.UserReportOptions{
 
 		Team:         teamFilter,
 		Role:         values.Get("role_filter"),
 		HasNoTeam:    values.Get("has_no_team") == "true",
 		HideActive:   hideActive,
 		HideInactive: hideInactive,
 		SearchTerm:   values.Get("search_term"),
-	}
-	options.PopulateDateRange(time.Now())
-	return options, nil
+	}, nil
 }

server/channels/store/sqlstore/user_store.go

@@ -2377,35 +2377,33 @@ func (us SqlUserStore) GetUserReport(filter *model.UserReportOptions) ([]*model.
 	}
 
 	if isPostgres {
-		query = query.LeftJoin("PostStats ps ON ps.UserId = u.Id")
+		joinSql := sq.And{}
 		if filter.StartAt > 0 {
 			startDate := time.UnixMilli(filter.StartAt)
-			query = query.Where(sq.Or{
-				sq.Expr("ps.UserId IS NULL"),
-				sq.GtOrEq{"ps.Day": startDate.Format("2006-01-02")},
-			})
+			joinSql = append(joinSql, sq.GtOrEq{"ps.Day": startDate.Format("2006-01-02")})
 		}
 		if filter.EndAt > 0 {
 			endDate := time.UnixMilli(filter.EndAt)
-			query = query.Where(sq.Or{
-				sq.Expr("ps.UserId IS NULL"),
-				sq.Lt{"ps.Day": endDate.Format("2006-01-02")},
-			})
+			joinSql = append(joinSql, sq.Lt{"ps.Day": endDate.Format("2006-01-02")})
+		}
+		sql, args, err := joinSql.ToSql()
+		if err != nil {
+			return nil, err
 		}
+		query = query.LeftJoin("PostStats ps ON ps.UserId = u.Id AND "+sql, args...)
 	} else {
-		query = query.LeftJoin("Posts p on p.UserId = u.Id")
+		joinSql := sq.And{}
 		if filter.StartAt > 0 {
-			query = query.Where(sq.Or{
-				sq.Expr("p.UserId IS NULL"),
-				sq.GtOrEq{"p.CreateAt": filter.StartAt},
-			})
+			joinSql = append(joinSql, sq.GtOrEq{"p.CreateAt": filter.StartAt})
 		}
 		if filter.EndAt > 0 {
-			query = query.Where(sq.Or{
-				sq.Expr("p.UserId IS NULL"),
-				sq.Lt{"p.CreateAt": filter.EndAt},
-			})
+			joinSql = append(joinSql, sq.Lt{"p.CreateAt": filter.EndAt})
+		}
+		sql, args, err := joinSql.ToSql()
+		if err != nil {
+			return nil, err
 		}
+		query = query.LeftJoin("Posts p ON p.UserId = u.Id AND "+sql, args...)
 	}
 
 	query = applyUserReportFilter(query, filter, isPostgres)

server/channels/store/storetest/user_store.go

@@ -6400,6 +6400,20 @@ func testGetUserReport(t *testing.T, rctx request.CTX, ss store.Store) {
 		require.Equal(t, users[60].Username, userReport[0].Username)
 	})
 
+	t.Run("should return all users regardless of date range", func(t *testing.T) {
+		userReport, err := ss.User().GetUserReport(&model.UserReportOptions{
+			ReportingBaseOptions: model.ReportingBaseOptions{
+				SortColumn: "Username",
+				PageSize:   50,
+				StartAt:    now.AddDate(1000, 0, 0).UnixMilli(),
+				EndAt:      now.AddDate(1000, 0, 0).UnixMilli(),
+			},
+		})
+
+		require.NoError(t, err)
+		require.Len(t, userReport, 50)
+	})
+
 	t.Run("should return accurate post stats for various date ranges", func(t *testing.T) {
 		userReport, err := ss.User().GetUserReport(&model.UserReportOptions{
 			ReportingBaseOptions: model.ReportingBaseOptions{