fix: implement pool_connection end

lib/base/pool.js

@@ -121,7 +121,7 @@ class BasePool extends EventEmitter {
     }
     for (let i = 0; i < this._allConnections.length; i++) {
       connection = this._allConnections.get(i);
-      connection._realEnd(endCB);
+      connection.end(endCB);
     }
   }
 
@@ -200,7 +200,7 @@ class BasePool extends EventEmitter {
             Date.now() - this._freeConnections.get(0).lastActiveTime >
               this.config.idleTimeout)
         ) {
-          this._freeConnections.get(0)._realEnd();
+          this._freeConnections.get(0).end();
         }
       } finally {
         this._removeIdleTimeoutConnections();

lib/base/pool_connection.js

@@ -29,16 +29,9 @@ class BasePoolConnection extends BaseConnection {
     this._pool.releaseConnection(this);
   }
 
-  end() {
-    const err = new Error(
-      'Calling conn.end() to release a pooled connection is ' +
-        'deprecated. In next version calling conn.end() will be ' +
-        'restored to default conn.end() behavior. Use ' +
-        'conn.release() instead.',
-    );
-    this.emit('warn', err);
-    console.warn(err.message);
-    this.release();
+  end(callback) {
+    this._removeFromPool();
+    super.end(callback);
   }
 
   destroy() {
@@ -58,6 +51,3 @@ class BasePoolConnection extends BaseConnection {
 
 BasePoolConnection.statementKey = BaseConnection.statementKey;
 module.exports = BasePoolConnection;
-
-// TODO: Remove this when we are removing PoolConnection#end
-BasePoolConnection.prototype._realEnd = BaseConnection.prototype.end;