1 files changed, 112 insertions, 0 deletions
diff --git a/models/migrations/v1_14/v158.go b/models/migrations/v1_14/v158.go
new file mode 100644
index 0000000000..e6c9e629f7
--- /dev/null
+++ b/models/migrations/v1_14/v158.go
@@ -0,0 +1,112 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package v1_14 //nolint
+
+import (
+	"fmt"
+	"strconv"
+
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+func UpdateCodeCommentReplies(x *xorm.Engine) error {
+	type Comment struct {
+		ID          int64  `xorm:"pk autoincr"`
+		CommitSHA   string `xorm:"VARCHAR(40)"`
+		Patch       string `xorm:"TEXT patch"`
+		Invalidated bool
+
+		// Not extracted but used in the below query
+		Type     int   `xorm:"INDEX"`
+		Line     int64 // - previous line / + proposed line
+		TreePath string
+		ReviewID int64 `xorm:"index"`
+	}
+
+	if err := x.Sync2(new(Comment)); err != nil {
+		return err
+	}
+
+	sqlSelect := `SELECT comment.id as id, first.commit_sha as commit_sha, first.patch as patch, first.invalidated as invalidated`
+	sqlTail := ` FROM comment INNER JOIN (
+		SELECT C.id, C.review_id, C.line, C.tree_path, C.patch, C.commit_sha, C.invalidated
+		FROM comment AS C
+		WHERE C.type = 21
+			AND C.created_unix =
+				(SELECT MIN(comment.created_unix)
+					FROM comment
+					WHERE comment.review_id = C.review_id
+					AND comment.type = 21
+					AND comment.line = C.line
+					AND comment.tree_path = C.tree_path)
+		) AS first
+		ON comment.review_id = first.review_id
+			AND comment.tree_path = first.tree_path AND comment.line = first.line
+	WHERE comment.type = 21
+		AND comment.id != first.id
+		AND comment.commit_sha != first.commit_sha`
+
+	var (
+		sqlCmd    string
+		start     = 0
+		batchSize = 100
+		sess      = x.NewSession()
+	)
+	defer sess.Close()
+	for {
+		if err := sess.Begin(); err != nil {
+			return err
+		}
+
+		if setting.Database.UseMSSQL {
+			if _, err := sess.Exec(sqlSelect + " INTO #temp_comments" + sqlTail); err != nil {
+				log.Error("unable to create temporary table")
+				return err
+			}
+		}
+
+		comments := make([]*Comment, 0, batchSize)
+
+		switch {
+		case setting.Database.UseMySQL:
+			sqlCmd = sqlSelect + sqlTail + " LIMIT " + strconv.Itoa(batchSize) + ", " + strconv.Itoa(start)
+		case setting.Database.UsePostgreSQL:
+			fallthrough
+		case setting.Database.UseSQLite3:
+			sqlCmd = sqlSelect + sqlTail + " LIMIT " + strconv.Itoa(batchSize) + " OFFSET " + strconv.Itoa(start)
+		case setting.Database.UseMSSQL:
+			sqlCmd = "SELECT TOP " + strconv.Itoa(batchSize) + " * FROM #temp_comments WHERE " +
+				"(id NOT IN ( SELECT TOP " + strconv.Itoa(start) + " id FROM #temp_comments ORDER BY id )) ORDER BY id"
+		default:
+			return fmt.Errorf("Unsupported database type")
+		}
+
+		if err := sess.SQL(sqlCmd).Find(&comments); err != nil {
+			log.Error("failed to select: %v", err)
+			return err
+		}
+
+		for _, comment := range comments {
+			if _, err := sess.Table("comment").ID(comment.ID).Cols("commit_sha", "patch", "invalidated").Update(comment); err != nil {
+				log.Error("failed to update comment[%d]: %v %v", comment.ID, comment, err)
+				return err
+			}
+		}
+
+		start += len(comments)
+
+		if err := sess.Commit(); err != nil {
+			return err
+		}
+		if len(comments) < batchSize {
+			break
+		}
+	}
+
+	return nil
+}