Add parent index to share table

Fixes #9327

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

core/Command/Db/AddMissingIndices.php

@@ -84,12 +84,20 @@ class AddMissingIndices extends Command {
 		if ($schema->hasTable('share')) {
 			$table = $schema->getTable('share');
 			if (!$table->hasIndex('share_with_index')) {
-				$output->writeln('<info>Adding additional index to the share table, this can take some time...</info>');
+				$output->writeln('<info>Adding additional share_with index to the share table, this can take some time...</info>');
 				$table->addIndex(['share_with'], 'share_with_index');
 				$this->connection->migrateToSchema($schema->getWrappedSchema());
 				$updated = true;
 				$output->writeln('<info>Share table updated successfully.</info>');
 			}
+
+			if (!$table->hasIndex('parent_index')) {
+				$output->writeln('<info>Adding additional parent index to the share table, this can take some time...</info>');
+				$table->addIndex(['parent'], 'parent_index');
+				$this->connection->migrateToSchema($schema->getWrappedSchema());
+				$updated = true;
+				$output->writeln('<info>Share table updated successfully.</info>');
+			}
 		}
 
 		if (!$updated) {

core/Migrations/Version13000Date20170718121200.php

@@ -401,6 +401,7 @@ class Version13000Date20170718121200 extends SimpleMigrationStep {
 			$table->addIndex(['file_source'], 'file_source_index');
 			$table->addIndex(['token'], 'token_index');
 			$table->addIndex(['share_with'], 'share_with_index');
+			$table->addIndex(['parent'], 'parent_index');
 		}
 
 		if (!$schema->hasTable('jobs')) {