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diff --git a/web/core/modules/comment/src/CommentStorageSchema.php b/web/core/modules/comment/src/CommentStorageSchema.php
new file mode 100644
index 000000000..2106a8ec2
--- /dev/null
+++ b/web/core/modules/comment/src/CommentStorageSchema.php
@@ -0,0 +1,73 @@
+<?php
+
+namespace Drupal\comment;
+
+use Drupal\Core\Entity\ContentEntityTypeInterface;
+use Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema;
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+
+/**
+ * Defines the comment schema handler.
+ */
+class CommentStorageSchema extends SqlContentEntityStorageSchema {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEntitySchema(ContentEntityTypeInterface $entity_type, $reset = FALSE) {
+    $schema = parent::getEntitySchema($entity_type, $reset);
+
+    $schema['comment_field_data']['indexes'] += [
+      'comment__status_pid' => ['pid', 'status'],
+      'comment__num_new' => [
+        'entity_id',
+        'entity_type',
+        'comment_type',
+        'status',
+        'created',
+        'cid',
+        'thread',
+      ],
+      'comment__entity_langcode' => [
+        'entity_id',
+        'entity_type',
+        'comment_type',
+        'default_langcode',
+      ],
+    ];
+
+    return $schema;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getSharedTableFieldSchema(FieldStorageDefinitionInterface $storage_definition, $table_name, array $column_mapping) {
+    $schema = parent::getSharedTableFieldSchema($storage_definition, $table_name, $column_mapping);
+    $field_name = $storage_definition->getName();
+
+    if ($table_name == 'comment_field_data') {
+      // Remove unneeded indexes.
+      unset($schema['indexes']['comment_field__pid__target_id']);
+      unset($schema['indexes']['comment_field__entity_id__target_id']);
+
+      switch ($field_name) {
+        case 'thread':
+          // Improves the performance of the comment__num_new index defined
+          // in getEntitySchema().
+          $schema['fields'][$field_name]['not null'] = TRUE;
+          break;
+
+        case 'created':
+          $this->addSharedTableFieldIndex($storage_definition, $schema, TRUE);
+          break;
+
+        case 'uid':
+          $this->addSharedTableFieldForeignKey($storage_definition, $schema, 'users', 'uid');
+      }
+    }
+
+    return $schema;
+  }
+
+}