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diff --git a/web/core/modules/views/src/Plugin/views/filter/ManyToOne.php b/web/core/modules/views/src/Plugin/views/filter/ManyToOne.php
new file mode 100644
index 000000000..e678dee82
--- /dev/null
+++ b/web/core/modules/views/src/Plugin/views/filter/ManyToOne.php
@@ -0,0 +1,135 @@
+<?php
+
+namespace Drupal\views\Plugin\views\filter;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\views\ViewExecutable;
+use Drupal\views\Plugin\views\display\DisplayPluginBase;
+use Drupal\views\ManyToOneHelper;
+
+/**
+ * Complex filter to handle filtering for many to one relationships,
+ * such as terms (many terms per node) or roles (many roles per user).
+ *
+ * The construct method needs to be overridden to provide a list of options;
+ * alternately, the valueForm and adminSummary methods need to be overridden
+ * to provide something that isn't just a select list.
+ *
+ * @ingroup views_filter_handlers
+ *
+ * @ViewsFilter("many_to_one")
+ */
+class ManyToOne extends InOperator {
+
+  /**
+   * @var \Drupal\views\ManyToOneHelper
+   *
+   * Stores the Helper object which handles the many_to_one complexity.
+   */
+  public $helper = NULL;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
+    parent::init($view, $display, $options);
+
+    $this->helper = new ManyToOneHelper($this);
+  }
+
+  protected function defineOptions() {
+    $options = parent::defineOptions();
+
+    $options['operator']['default'] = 'or';
+    $options['value']['default'] = [];
+
+    if (isset($this->helper)) {
+      $this->helper->defineOptions($options);
+    }
+    else {
+      $helper = new ManyToOneHelper($this);
+      $helper->defineOptions($options);
+    }
+
+    return $options;
+  }
+
+  public function operators() {
+    $operators = [
+      'or' => [
+        'title' => $this->t('Is one of'),
+        'short' => $this->t('or'),
+        'short_single' => $this->t('='),
+        'method' => 'opHelper',
+        'values' => 1,
+        'ensure_my_table' => 'helper',
+      ],
+      'and' => [
+        'title' => $this->t('Is all of'),
+        'short' => $this->t('and'),
+        'short_single' => $this->t('='),
+        'method' => 'opHelper',
+        'values' => 1,
+        'ensure_my_table' => 'helper',
+      ],
+      'not' => [
+        'title' => $this->t('Is none of'),
+        'short' => $this->t('not'),
+        'short_single' => $this->t('<>'),
+        'method' => 'opHelper',
+        'values' => 1,
+        'ensure_my_table' => 'helper',
+      ],
+    ];
+    // if the definition allows for the empty operator, add it.
+    if (!empty($this->definition['allow empty'])) {
+      $operators += [
+        'empty' => [
+          'title' => $this->t('Is empty (NULL)'),
+          'method' => 'opEmpty',
+          'short' => $this->t('empty'),
+          'values' => 0,
+        ],
+        'not empty' => [
+          'title' => $this->t('Is not empty (NOT NULL)'),
+          'method' => 'opEmpty',
+          'short' => $this->t('not empty'),
+          'values' => 0,
+        ],
+      ];
+    }
+
+    return $operators;
+  }
+
+  protected $valueFormType = 'select';
+  protected function valueForm(&$form, FormStateInterface $form_state) {
+    parent::valueForm($form, $form_state);
+
+    if (!$form_state->get('exposed')) {
+      $this->helper->buildOptionsForm($form, $form_state);
+    }
+  }
+
+  /**
+   * Override ensureMyTable so we can control how this joins in.
+   * The operator actually has influence over joining.
+   */
+  public function ensureMyTable() {
+    // Defer to helper if the operator specifies it.
+    $info = $this->operators();
+    if (isset($info[$this->operator]['ensure_my_table']) && $info[$this->operator]['ensure_my_table'] == 'helper') {
+      return $this->helper->ensureMyTable();
+    }
+
+    return parent::ensureMyTable();
+  }
+
+  protected function opHelper() {
+    if (empty($this->value)) {
+      return;
+    }
+    $this->helper->addFilter();
+  }
+
+}