Added support for SELECT * FROM dual;

Author: udan11

src/Components/Expression.php

@@ -175,7 +175,10 @@ public static function parse(Parser $parser, TokensList $list, array $options =
                 continue;
             }
 
-            if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) {
+            if (($token->type === Token::TYPE_KEYWORD)
+                && ($token->flags & Token::FLAG_KEYWORD_RESERVED)
+                && ($token->value !== 'DUAL')
+            ) {
                 // Keywords may be found only between brackets.
                 if ($brackets === 0) {
                     if ((empty($options['noAlias'])) && ($token->value === 'AS')) {

src/Components/ExpressionArray.php

@@ -67,7 +67,10 @@ public static function parse(Parser $parser, TokensList $list, array $options =
                 continue;
             }
 
-            if (($token->type === Token::TYPE_KEYWORD) && ($token->flags & Token::FLAG_KEYWORD_RESERVED)) {
+            if (($token->type === Token::TYPE_KEYWORD)
+                && ($token->flags & Token::FLAG_KEYWORD_RESERVED)
+                && ($token->value !== 'DUAL')
+            ) {
                 // No keyword is expected.
                 break;
             }