no issue - make tests and result great again

src/Bridge/Pdo/PdoQueryBuilder.php

@@ -121,6 +121,7 @@ protected function doExecuteQuery(string $expression, array $arguments = []): Re
         $this->dieIfClosed();
 
         $statement = $this->connection->prepare($expression, [\PDO::ATTR_CURSOR => \PDO::CURSOR_FWDONLY]);
+        $statement->setFetchMode(\PDO::FETCH_ASSOC);
         $statement->execute($arguments);
 
         $result = new IterableResult(

src/Result/AbstractResult.php

@@ -429,6 +429,10 @@ protected function fetchNext(): null|array
     /**
      * Get column value in row.
      *
+     * Warning: for this method to work with PDO, fetch mode must be set
+     * to \PDO::FETCH_ASSOC, other wise columns count and order may vary
+     * and cause unpredictable results.
+     *
      * @return mixed $value
      *   Whatever is the row value, or null if no value found.
      */
@@ -445,6 +449,7 @@ protected function getColumnValue(?array $row, int|string $name = 0): mixed
             if ($name >= $this->columnCount()) {
                 throw new ResultError(\sprintf("Column with index %d does not exist in result.", $name));
             }
+
             return \array_values($row)[$name];
         }