conf, roles: add the config of auto-random, expression and new-collat…

…ion (#1217)

Co-authored-by: liubo <[email protected]>

conf/tidb.yml

@@ -35,6 +35,9 @@ global:
   # the data type of its primary key column is an integer, the primary key cannot be dropped.
   # alter-primary-key: false
 
+  # Whether new collations are enabled, as indicated by its name, this configuration entry take effect ONLY when a TiDB cluster bootstraps for the first time.
+  new_collations_enabled_on_first_bootstrap: false
+
 log:
   # Log level: debug, info, warn, error, fatal.
   # level: "info"
@@ -173,3 +176,10 @@ pessimistic_txn:
 
   # max retry count for a statement in a pessimistic transaction.
   # max-retry-count: 256
+
+experimental:
+  # enable column attribute `auto_random` to be defined on the primary key column.
+  allow-auto-random: false
+
+  # enable creating expression index.
+  allow-expression-index: false

roles/tidb/templates/tidb.toml.j2

@@ -86,3 +86,8 @@
 {% for item, value in tidb_conf.pessimistic_txn | dictsort -%}
 {{ item }} = {{ value | to_json }}
 {% endfor %}
+
+[experimental]
+{% for item, value in tidb_conf.experimental | dictsort -%}
+{{ item }} = {{ value | to_json }}
+{% endfor %}

roles/tidb/vars/default.yml

@@ -47,6 +47,9 @@ global:
   # the data type of its primary key column is an integer, the primary key cannot be dropped.
   alter-primary-key: false
 
+  # Whether new collations are enabled, as indicated by its name, this configuration entry take effect ONLY when a TiDB cluster bootstraps for the first time.
+  new_collations_enabled_on_first_bootstrap: false
+
 log:
   # Log level: debug, info, warn, error, fatal.
   level: "info"
@@ -187,3 +190,10 @@ pessimistic_txn:
 
   # max retry count for a statement in a pessimistic transaction.
   max-retry-count: 256
+
+experimental:
+  # enable column attribute `auto_random` to be defined on the primary key column.
+  allow-auto-random: false
+
+  # enable creating expression index.
+  allow-expression-index: false