Merge #289 - Fixes #288 - Lexer fails to detect "*" as a wildcard.

Pull-request: #289
Fixes: #288
Signed-off-by: William Desportes <[email protected]>

Author: williamdes

src/Lexer.php

@@ -343,6 +343,39 @@ public function lex()
 
         // Saving the tokens list.
         $this->list = $list;
+
+        $this->solveAmbiguityOnStarOperator();
+    }
+
+    /**
+     * Resolves the ambiguity when dealing with the "*" operator.
+     *
+     * In SQL statements, the "*" operator can be an arithmetic operator (like in 2*3) or an SQL wildcard (like in
+     * SELECT a.* FROM ...). To solve this ambiguity, the solution is to find the next token, excluding whitespaces and
+     * comments, right after the "*" position. The "*" is for sure an SQL wildcard if the next token found is any of:
+     * - "FROM" (the FROM keyword like in "SELECT * FROM...");
+     * - "USING" (the USING keyword like in "DELETE table_name.* USING...");
+     * - "," (a comma separator like in "SELECT *, field FROM...");
+     * - ")" (a closing parenthesis like in "COUNT(*)").
+     * This methods will change the flag of the "*" tokens when any of those condition above is true. Otherwise, the
+     * default flag (arithmetic) will be kept.
+     *
+     * @return void
+     */
+    private function solveAmbiguityOnStarOperator()
+    {
+        $iBak = $this->list->idx;
+        while (null !== ($starToken = $this->list->getNextOfTypeAndValue(Token::TYPE_OPERATOR, '*'))) {
+            // ::getNext already gets rid of whitespaces and comments.
+            if (($next = $this->list->getNext()) !== null) {
+                if (($next->type === Token::TYPE_KEYWORD && in_array($next->value, array('FROM', 'USING'), true))
+                    || ($next->type === Token::TYPE_OPERATOR && in_array($next->value, array(',', ')'), true))
+                ) {
+                    $starToken->flags = Token::FLAG_OPERATOR_SQL;
+                }
+            }
+        }
+        $this->list->idx = $iBak;
     }
 
     /**

tests/Lexer/LexerTest.php

@@ -74,6 +74,8 @@ public function lexProvider()
             array('lexer/lexKeyword2'),
             array('lexer/lexNumber'),
             array('lexer/lexOperator'),
+            array('lexer/lexOperatorStarIsArithmetic'),
+            array('lexer/lexOperatorStarIsWildcard'),
             array('lexer/lexString'),
             array('lexer/lexStringErr1'),
             array('lexer/lexSymbol'),

tests/data/bugs/gh9.out

@@ -4,4 +4,4 @@ SELECT * FROM bar";s:5:"lexer";O:26:"PhpMyAdmin\SqlParser\Lexer":8:{s:3:"str";s:
 SELECT a,b FROM foo GO
 SELECT * FROM bar";s:3:"len";i:53;s:4:"last";i:53;s:4:"list";O:31:"PhpMyAdmin\SqlParser\TokensList":3:{s:6:"tokens";a:24:{i:0;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:9:"DELIMITER";s:5:"value";s:9:"DELIMITER";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:0;}i:1;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:9;}i:2;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:2:"GO";s:5:"value";s:2:"GO";s:7:"keyword";N;s:4:"type";i:9;s:5:"flags";i:0;s:8:"position";i:10;}i:3;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"
 ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:12;}i:4;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:6:"SELECT";s:5:"value";s:6:"SELECT";s:7:"keyword";s:6:"SELECT";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:13;}i:5;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:19;}i:6;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"a";s:5:"value";s:1:"a";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:20;}i:7;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:",";s:5:"value";s:1:",";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:16;s:8:"position";i:21;}i:8;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"b";s:5:"value";s:1:"b";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:22;}i:9;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:23;}i:10;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:4:"FROM";s:5:"value";s:4:"FROM";s:7:"keyword";s:4:"FROM";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:24;}i:11;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:28;}i:12;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:3:"foo";s:5:"value";s:3:"foo";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:29;}i:13;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:32;}i:14;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:2:"GO";s:5:"value";s:2:"GO";s:7:"keyword";N;s:4:"type";i:9;s:5:"flags";i:0;s:8:"position";i:33;}i:15;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"
-";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:35;}i:16;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:6:"SELECT";s:5:"value";s:6:"SELECT";s:7:"keyword";s:6:"SELECT";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:36;}i:17;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:42;}i:18;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"*";s:5:"value";s:1:"*";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:43;}i:19;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:44;}i:20;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:4:"FROM";s:5:"value";s:4:"FROM";s:7:"keyword";s:4:"FROM";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:45;}i:21;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:49;}i:22;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:3:"bar";s:5:"value";s:3:"bar";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:50;}i:23;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";N;s:5:"value";N;s:7:"keyword";N;s:4:"type";i:9;s:5:"flags";i:0;s:8:"position";N;}}s:5:"count";i:24;s:3:"idx";i:0;}s:9:"delimiter";s:2:"GO";s:12:"delimiterLen";i:2;s:6:"strict";b:0;s:6:"errors";a:0:{}}s:6:"parser";N;s:6:"errors";a:2:{s:5:"lexer";a:0:{}s:6:"parser";a:0:{}}}
+";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:35;}i:16;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:6:"SELECT";s:5:"value";s:6:"SELECT";s:7:"keyword";s:6:"SELECT";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:36;}i:17;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:42;}i:18;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"*";s:5:"value";s:1:"*";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:16;s:8:"position";i:43;}i:19;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:44;}i:20;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:4:"FROM";s:5:"value";s:4:"FROM";s:7:"keyword";s:4:"FROM";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:45;}i:21;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:49;}i:22;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:3:"bar";s:5:"value";s:3:"bar";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:50;}i:23;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";N;s:5:"value";N;s:7:"keyword";N;s:4:"type";i:9;s:5:"flags";i:0;s:8:"position";N;}}s:5:"count";i:24;s:3:"idx";i:0;}s:9:"delimiter";s:2:"GO";s:12:"delimiterLen";i:2;s:6:"strict";b:0;s:6:"errors";a:0:{}}s:6:"parser";N;s:6:"errors";a:2:{s:5:"lexer";a:0:{}s:6:"parser";a:0:{}}}

tests/data/bugs/pma11836.out

@@ -4,4 +4,4 @@ SELECT * FROM bar //";s:5:"lexer";O:26:"PhpMyAdmin\SqlParser\Lexer":8:{s:3:"str"
 SELECT a,b FROM test //
 SELECT * FROM bar //";s:3:"len";i:56;s:4:"last";i:56;s:4:"list";O:31:"PhpMyAdmin\SqlParser\TokensList":3:{s:6:"tokens";a:29:{i:0;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:8:"DELIMTER";s:5:"value";s:8:"DELIMTER";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:0;}i:1;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:8;}i:2;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:9;}i:3;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:10;}i:4;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"
 ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:11;}i:5;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:6:"SELECT";s:5:"value";s:6:"SELECT";s:7:"keyword";s:6:"SELECT";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:12;}i:6;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:18;}i:7;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"a";s:5:"value";s:1:"a";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:19;}i:8;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:",";s:5:"value";s:1:",";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:16;s:8:"position";i:20;}i:9;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"b";s:5:"value";s:1:"b";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:21;}i:10;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:22;}i:11;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:4:"FROM";s:5:"value";s:4:"FROM";s:7:"keyword";s:4:"FROM";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:23;}i:12;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:27;}i:13;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:4:"test";s:5:"value";s:4:"test";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:28;}i:14;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:32;}i:15;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:33;}i:16;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:34;}i:17;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"
-";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:35;}i:18;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:6:"SELECT";s:5:"value";s:6:"SELECT";s:7:"keyword";s:6:"SELECT";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:36;}i:19;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:42;}i:20;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"*";s:5:"value";s:1:"*";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:43;}i:21;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:44;}i:22;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:4:"FROM";s:5:"value";s:4:"FROM";s:7:"keyword";s:4:"FROM";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:45;}i:23;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:49;}i:24;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:3:"bar";s:5:"value";s:3:"bar";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:50;}i:25;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:53;}i:26;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:54;}i:27;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:55;}i:28;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";N;s:5:"value";N;s:7:"keyword";N;s:4:"type";i:9;s:5:"flags";i:0;s:8:"position";N;}}s:5:"count";i:29;s:3:"idx";i:0;}s:9:"delimiter";s:1:";";s:12:"delimiterLen";i:1;s:6:"strict";b:0;s:6:"errors";a:0:{}}s:6:"parser";N;s:6:"errors";a:2:{s:5:"lexer";a:0:{}s:6:"parser";a:0:{}}}
+";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:35;}i:18;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:6:"SELECT";s:5:"value";s:6:"SELECT";s:7:"keyword";s:6:"SELECT";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:36;}i:19;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:42;}i:20;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"*";s:5:"value";s:1:"*";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:16;s:8:"position";i:43;}i:21;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:44;}i:22;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:4:"FROM";s:5:"value";s:4:"FROM";s:7:"keyword";s:4:"FROM";s:4:"type";i:1;s:5:"flags";i:3;s:8:"position";i:45;}i:23;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:49;}i:24;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:3:"bar";s:5:"value";s:3:"bar";s:7:"keyword";N;s:4:"type";i:0;s:5:"flags";i:0;s:8:"position";i:50;}i:25;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:" ";s:5:"value";s:1:" ";s:7:"keyword";N;s:4:"type";i:3;s:5:"flags";i:0;s:8:"position";i:53;}i:26;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:54;}i:27;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";s:1:"/";s:5:"value";s:1:"/";s:7:"keyword";N;s:4:"type";i:2;s:5:"flags";i:1;s:8:"position";i:55;}i:28;O:26:"PhpMyAdmin\SqlParser\Token":6:{s:5:"token";N;s:5:"value";N;s:7:"keyword";N;s:4:"type";i:9;s:5:"flags";i:0;s:8:"position";N;}}s:5:"count";i:29;s:3:"idx";i:0;}s:9:"delimiter";s:1:";";s:12:"delimiterLen";i:1;s:6:"strict";b:0;s:6:"errors";a:0:{}}s:6:"parser";N;s:6:"errors";a:2:{s:5:"lexer";a:0:{}s:6:"parser";a:0:{}}}

tests/data/lexer/lexDelimiter.out

@@ -0,0 +1,50 @@
+SELECT 2*3
+SELECT 2 * 3
+SELECT field * 8
+SELECT 8 * field
+SELECT foo * bar
+SELECT `escaped_field` * 16
+SELECT 16 * `escaped_field`
+SELECT `foo` * `bar`
+SELECT `foo`*`bar`
+SELECT 1 * (SELECT COUNT(1) FROM nb_rows)
+SELECT (SELECT COUNT(1) FROM nb_rows) * 1
+SELECT (SELECT COUNT(1) FROM nb_rows) * (SELECT COUNT(1) FROM nb_rows)
+SELECT (1 * 1) * (2 * 2)
+SELECT 1 * (2 * (3 * (4 * 5)))
+SELECT 2.71 * 3.14
+SELECT 2.71 * -3.14
+SELECT -2.71 * 3.14
+SELECT -2.71 * -3.14
+SELECT 0xABC * 0xCBA
+SELECT 0xABC * -0xCBA
+SELECT -0xABC * 0xCBA
+SELECT -0xABC * -0xCBA
+
+-- Now same but with comments inside (C style comments could conflicts with operator if lexer is failing)
+SELECT 2 * /* comment */3
+SELECT 2/* comment */ * 3
+SELECT 2/* comment with * inside */ * 3
+SELECT /* comment */ field /* comment */ * /* comment */ 8 /* comment */
+SELECT /* comment */ 8 /* comment */ * /* comment */ field /* comment */
+SELECT /* comment */ foo /* comment */ * /* comment */ bar /* comment */
+SELECT /* comment */ `escaped_field` /* comment */ * /* comment */ 16 /* comment */
+SELECT /* comment */ 16 /* comment */ * /* comment */ `escaped_field` /* comment */
+SELECT /* comment */ `foo` /* comment */ * /* comment */ `bar` /* comment */
+SELECT /* `comment` */ `foo` /* `comment` */ * /* `comment` */ `bar` /* `comment` */
+SELECT /* comment */ 1 /* comment */ * /* comment */ (SELECT COUNT(/* comment */1/* comment */) /* comment */ FROM nb_rows)
+SELECT /* comment */ (SELECT COUNT(1) /* comment */FROM/* comment */ nb_rows) /* comment */ * /* comment */ 1
+SELECT (SELECT /* comment */ COUNT(1) /* comment */ FROM /* comment */ nb_rows) /* comment */ * /* comment */ (SELECT COUNT(1) FROM nb_rows)
+SELECT (1 * 1) /* comment */ * /* comment */ (2 * 2)
+SELECT /* comment */ 1 /* comment */ * /* comment */ (2 /* comment */ * /* comment */ (3 /* comment */ * /* comment */ (4 /* comment */ * /* comment */ 5))) /* comment */
+SELECT 2.71 /* comment */ * /* comment */ 3.14
+SELECT 2.71 /* comment */ * /* comment */ -3.14
+SELECT -2.71 /* comment */ * /* comment */ 3.14
+SELECT -2.71 /* comment */ * /* comment */ -3.14
+SELECT 0xABC /* comment */ * /* comment */ 0xCBA
+SELECT 0xABC /* comment */ * /* comment */ -0xCBA
+SELECT -0xABC /* comment */ * /* comment */ 0xCBA
+SELECT -0xABC /* comment */ * /* comment */ -0xCBA
+SELECT 1 /* comment with FROM keyword */ * /* comment with USING keyword */1
+SELECT 1 /* comment with ) */ * /* comment with , keyword */1
+