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diff --git a/web/core/modules/views/src/Plugin/views/join/JoinPluginInterface.php b/web/core/modules/views/src/Plugin/views/join/JoinPluginInterface.php
new file mode 100644
index 000000000..f3fca7df2
--- /dev/null
+++ b/web/core/modules/views/src/Plugin/views/join/JoinPluginInterface.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace Drupal\views\Plugin\views\join;
+
+/**
+ * Represents a join and creates the SQL necessary to implement the join.
+ *
+ * Extensions of this class can be used to create more interesting joins.
+ */
+interface JoinPluginInterface {
+
+  /**
+   * Builds the SQL for the join this object represents.
+   *
+   * When possible, try to use table alias instead of table names.
+   *
+   * @param $select_query
+   *   An select query object.
+   * @param $table
+   *   The base table to join.
+   * @param \Drupal\views\Plugin\views\query\QueryPluginBase $view_query
+   *   The source views query.
+   */
+  public function buildJoin($select_query, $table, $view_query);
+
+}