feat: support comment on extension in pg

Author: taozhi8833998

pegjs/postgresql.pegjs

@@ -3231,7 +3231,7 @@ comment_on_option
       name,
     }
   }
-  / t:(KW_INDEX / KW_COLLATION / KW_TABLESPACE / KW_SCHEMA / 'DOMAIN'i / KW_DATABASE / 'ROLE'i / 'SEQUENCE'i / 'SERVER'i / 'SUBSCRIPTION'i ) __ name:ident_type {
+  / t:(KW_INDEX / KW_COLLATION / KW_TABLESPACE / KW_SCHEMA / 'DOMAIN'i / KW_DATABASE / 'ROLE'i / 'SEQUENCE'i / 'SERVER'i / 'SUBSCRIPTION'i / 'EXTENSION'i) __ name:ident_type {
     // => { type: string; name: ident; }
     return {
       type: t.toLowerCase(),

test/postgres.spec.js

@@ -1861,6 +1861,13 @@ describe('Postgres', () => {
         'SELECT 100.0 * COUNT(_timestamp) AS "y_axis_1" FROM "default"'
       ]
     },
+    {
+      title: 'comment on extension',
+      sql: [
+        "COMMENT ON EXTENSION pgcrypto IS 'HELLO WORLD'",
+        "COMMENT ON EXTENSION pgcrypto IS 'HELLO WORLD'"
+      ]
+    },
   ]
   function neatlyNestTestedSQL(sqlList){
     sqlList.forEach(sqlInfo => {