fix non-standard invalid date test

NO_ZERO_DATE mode and NO_ZERO_IN_DATE mode are part of the strict SQL
mode used by MySQL 8.0. Non-standard dates like '0000-00-00' are now
stored and retrieved as NULL.

This patch introduces changes to one of the integration tests to ensure
this change in behavior is accounted for with the latest MySQL server
versions.

Author: ruiquelhas

lib/packets/packet.js

@@ -1,3 +1,8 @@
+// This file was modified by Oracle on June 1, 2021.
+// A comment describing some changes in the strict default SQL mode regarding
+// non-standard dates was introduced.
+// Modifications copyright (c) 2021, Oracle and/or its affiliates.
+
 'use strict';
 
 const ErrorCodeToName = require('../constants/errors.js');
@@ -274,6 +279,11 @@ class Packet {
       if (length > 10) {
         ms = this.readInt32() / 1000;
       }
+      // NO_ZERO_DATE mode and NO_ZERO_IN_DATE mode are part of the strict
+      // default SQL mode used by MySQL 8.0. This means that non-standard
+      // dates like '0000-00-00' become NULL. For older versions and other
+      // possible MySQL flavours we still need to account for the
+      // non-standard behaviour.
       if (y + m + d + H + M + S + ms === 0) {
         return INVALID_DATE;
       }

test/integration/connection/test-invalid-date-result.js

@@ -1,3 +1,8 @@
+// This file was modified by Oracle on June 1, 2021.
+// The test has been updated to be able to pass with different default
+// strict modes used by different MySQL server versions.
+// Modifications copyright (c) 2021, Oracle and/or its affiliates.
+
 'use strict';
 
 const common = require('../../common');
@@ -6,12 +11,34 @@ const assert = require('assert');
 
 let rows = undefined;
 
-connection.execute('SELECT TIMESTAMP(0000-00-00) t', [], (err, _rows) => {
+// Disable NO_ZERO_DATE mode and NO_ZERO_IN_DATE mode to ensure the old
+// behaviour.
+const strictModes = ['NO_ZERO_DATE', 'NO_ZERO_IN_DATE'];
+
+connection.query('SELECT variable_value as value FROM performance_schema.session_variables where variable_name = ?', ['sql_mode'], (err, _rows) => {
   if (err) {
     throw err;
   }
-  rows = _rows;
-  connection.end();
+
+  const deprecatedSqlMode = _rows[0].value
+    .split(',')
+    .filter(mode => strictModes.indexOf(mode) === -1)
+    .join(',');
+
+  connection.query(`SET sql_mode=?`, [deprecatedSqlMode], err => {
+    if (err) {
+      throw err;
+    }
+
+    connection.execute('SELECT TIMESTAMP(0000-00-00) t', [], (err, _rows) => {
+      if (err) {
+        throw err;
+      }
+
+      rows = _rows;
+      connection.end();
+    });
+  });
 });
 
 function isInvalidTime(t) {