Fix ALTER index parsing: DESC should not begin a new statement (#592)

Signed-off-by: Nicolai Ehrhardt <245527909+predictor2718@users.noreply.github.com>

Author: predictor2718

src/Components/AlterOperation.php

@@ -453,7 +453,11 @@ public static function parse(Parser $parser, TokensList $list, array $options =
                     $token->type !== Token::TYPE_STRING &&
                     $token->value !== 'CHECK'
                 ) {
-                    if (isset(Parser::$STATEMENT_PARSERS[$arrayKey]) && Parser::$STATEMENT_PARSERS[$arrayKey] !== '') {
+                    if (
+                        isset(Parser::$STATEMENT_PARSERS[$arrayKey])
+                        && Parser::$STATEMENT_PARSERS[$arrayKey] !== ''
+                        && ! in_array($arrayKey, ['ASC', 'DESC'], true)
+                    ) {
                         $list->idx++; // Ignore the current token
                         $nextToken = $list->getNext();