Merge SQL schema changes for 1.16 release (#2661)

Author: yycptt

schema/mysql/v57/temporal/versioned/v1.9/alter_columns.sql renamed to schema/mysql/v57/temporal/versioned/v1.8/alter_columns.sql

@@ -1,8 +1,9 @@
 {
     "CurrVersion": "1.8",
     "MinCompatibleVersion": "1.0",
-    "Description": "drop unused tasks table",
+    "Description": "drop unused tasks table; expand VARCHAR columns governed by maxIDLength to VARCHAR(255)",
     "SchemaUpdateCqlFiles": [
-        "drop_unused_tasks_table.sql"
+        "drop_unused_tasks_table.sql",
+        "alter_columns.sql"
     ]
 }

schema/mysql/v57/temporal/versioned/v1.8/manifest.json

@@ -27,7 +27,7 @@ package mysql
 // NOTE: whenever there is a new database schema update, plz update the following versions
 
 // Version is the MySQL database release version
-const Version = "1.9"
+const Version = "1.8"
 
 // VisibilityVersion is the MySQL visibility database release version
 const VisibilityVersion = "1.1"

schema/mysql/v57/temporal/versioned/v1.9/manifest.json

@@ -1,8 +1,9 @@
 {
     "CurrVersion": "1.8",
     "MinCompatibleVersion": "1.0",
-    "Description": "drop unused tasks table",
+    "Description": "drop unused tasks table; Expand VARCHAR columns governed by maxIDLength to VARCHAR(255)",
     "SchemaUpdateCqlFiles": [
-        "drop_unused_tasks_table.sql"
+        "drop_unused_tasks_table.sql",
+        "alter_columns.sql"
     ]
 }

schema/mysql/version.go

@@ -28,7 +28,7 @@ package postgresql
 
 // Version is the Postgres database release version
 // Temporal supports both MySQL and Postgres officially, so upgrade should be performed for both MySQL and Postgres
-const Version = "1.9"
+const Version = "1.8"
 
 // VisibilityVersion is the Postgres visibility database release version
 // Temporal supports both MySQL and Postgres officially, so upgrade should be performed for both MySQL and Postgres