Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/db/migrations/mysql/000049_create_channels.up.sql

@@ -0,0 +1,175 @@
+CREATE TABLE IF NOT EXISTS Channels (
+    Id varchar(26) NOT NULL,
+    CreateAt bigint(20),
+    UpdateAt bigint(20),
+    DeleteAt bigint(20),
+    TeamId varchar(26),
+    Type varchar(1),
+    DisplayName varchar(64),
+    Name varchar(64),
+    Header text,
+    Purpose varchar(128),
+    LastPostAt bigint(20),
+    TotalMsgCount bigint(20),
+    ExtraUpdateAt bigint(20),
+    CreatorId varchar(26),
+    PRIMARY KEY (Id),
+    UNIQUE KEY Name (Name, TeamId),
+    KEY idx_channels_team_id (TeamId),
+    KEY idx_channels_name (Name),
+    KEY idx_channels_update_at (UpdateAt),
+    KEY idx_channels_create_at (CreateAt),
+    KEY idx_channels_delete_at (DeleteAt),
+    KEY idx_channels_displayname (DisplayName),
+    FULLTEXT KEY idx_channels_txt (Name,DisplayName) 
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT column_type FROM Information_Schema.Columns
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND column_name = 'Purpose'
+    ) != 'varchar(250)',
+    'ALTER TABLE Channels MODIFY Purpose varchar(250)',
+    'SELECT 1'
+));
+
+PREPARE alterIfTypeDifferent FROM @preparedStatement;
+EXECUTE alterIfTypeDifferent;
+DEALLOCATE PREPARE alterIfTypeDifferent;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_channels_displayname'
+    ) > 0,
+    'DROP INDEX idx_channels_displayname ON Channels;',
+    'SELECT 1'
+));
+
+PREPARE removeIndexIfExists FROM @preparedStatement;
+EXECUTE removeIndexIfExists;
+DEALLOCATE PREPARE removeIndexIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND column_name = 'SchemeId'
+    ) > 0,
+    'SELECT 1',
+    'ALTER TABLE Channels ADD COLUMN SchemeId varchar(26);'
+));
+
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_channels_txt'
+    ) > 0,
+    'DROP INDEX idx_channels_txt ON Channels;',
+    'SELECT 1'
+));
+
+PREPARE removeIndexIfExists FROM @preparedStatement;
+EXECUTE removeIndexIfExists;
+DEALLOCATE PREPARE removeIndexIfExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND column_name = 'GroupConstrained'
+    ) > 0,
+    'SELECT 1',
+    'ALTER TABLE Channels ADD COLUMN GroupConstrained tinyint(4);'
+));
+
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT column_type FROM Information_Schema.Columns
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND column_name = 'GroupConstrained'
+    ) != 'tinyint(1)',
+    'ALTER TABLE Channels MODIFY GroupConstrained tinyint(1)',
+    'SELECT 1'
+));
+
+PREPARE alterIfTypeDifferent FROM @preparedStatement;
+EXECUTE alterIfTypeDifferent;
+DEALLOCATE PREPARE alterIfTypeDifferent;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_channels_scheme_id'
+    ) > 0,
+    'SELECT 1',
+    'CREATE INDEX idx_channels_scheme_id ON Channels(SchemeId);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_channel_search_txt'
+    ) > 0,
+    'SELECT 1',
+    'CREATE FULLTEXT INDEX idx_channel_search_txt ON Channels(Name,DisplayName,Purpose);'
+));
+
+PREPARE createIndexIfNotExists FROM @preparedStatement;
+EXECUTE createIndexIfNotExists;
+DEALLOCATE PREPARE createIndexIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND column_name = 'Shared'
+    ) > 0,
+    'SELECT 1',
+    'ALTER TABLE Channels ADD COLUMN Shared tinyint(1);'
+));
+
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;
+
+SET @preparedStatement = (SELECT IF(
+    (
+        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
+        WHERE table_name = 'Channels'
+        AND table_schema = DATABASE()
+        AND index_name = 'idx_channels_name'
+    ) > 0,
+    'DROP INDEX idx_channels_name ON Channels;',
+    'SELECT 1'
+));
+
+PREPARE removeIndexIfExists FROM @preparedStatement;
+EXECUTE removeIndexIfExists;
+DEALLOCATE PREPARE removeIndexIfExists;