Apply some phpstan detected errors fixes

[ci skip]
Signed-off-by: William Desportes <[email protected]>

Author: williamdes

src/Statements/CreateStatement.php

@@ -286,7 +286,7 @@ class CreateStatement extends Statement
      *
      * Used by `CREATE TABLE`, `CREATE VIEW`
      *
-     * @var SelectStatement
+     * @var SelectStatement|null
      */
     public $select;
 
@@ -684,6 +684,7 @@ public function parse(Parser $parser, TokensList $list)
                 $this->body[] = $token;
             }
         } elseif ($this->options->has('VIEW')) {
+            /** @var Token $token */
             $token = $list->getNext(); // Skipping whitespaces and comments.
 
             // Parsing columns list.