Issue #2443681 by daffie, mradcliffe, bzrudi71: PostgreSQL: Fix user\Tests\UserAccountLinksTest

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

@@ -109,12 +109,24 @@ public function queryTableInformation($table) {
       $this->connection->addSavepoint();
 
       try {
+        // Check if the table information exists in the PostgreSQL metadata.
+        $table_information_exists = (bool) $this->connection->query("SELECT 1 FROM pg_class WHERE relname = :table", array(':table' => $table_name))->fetchField();
+
+        // If the table information does not yet exist in the PostgreSQL
+        // metadata, then return the default table information here, so that it
+        // will not be cached.
+        if (!$table_information_exists) {
+          $this->connection->releaseSavepoint();
+          return $table_information;
+        }
+        else {
           $result = $this->connection->query("SELECT column_name, data_type, column_default FROM information_schema.columns WHERE table_schema = :schema AND table_name = :table AND (data_type = 'bytea' OR (numeric_precision IS NOT NULL AND column_default LIKE :default))", array(
             ':schema' => $schema,
             ':table' => $table_name,
             ':default' => '%nextval%',
           ));
         }
+      }
       catch (\Exception $e) {
         $this->connection->rollbackSavepoint();
         throw $e;