Fix operator ":=" not recognized on SET statement.

Author: niconoe-

src/Components/SetOperation.php

@@ -10,6 +10,7 @@
 use PhpMyAdmin\SqlParser\TokensList;
 
 use function implode;
+use function in_array;
 use function is_array;
 use function trim;
 
@@ -63,7 +64,7 @@ public static function parse(Parser $parser, TokensList $list, array $options =
          * Below are the states of the parser.
          *
          *      0 ---------------------[ col_name ]--------------------> 0
-         *      0 ------------------------[ = ]------------------------> 1
+         *      0 ---------------------[ = or := ]---------------------> 1
          *      1 -----------------------[ value ]---------------------> 1
          *      1 ------------------------[ , ]------------------------> 0
          *
@@ -104,7 +105,7 @@ public static function parse(Parser $parser, TokensList $list, array $options =
             }
 
             if ($state === 0) {
-                if ($token->token === '=') {
+                if (in_array($token->token, ['=', ':='], true)) {
                     $state = 1;
                 } elseif ($token->value !== ',') {
                     $expr->column .= $token->token;

tests/data/parser/parseSetVariable2.out

@@ -111,7 +111,13 @@
                     "options": []
                 },
                 "end_options": null,
-                "set": [],
+                "set": [
+                    {
+                        "@type": "PhpMyAdmin\\SqlParser\\Components\\SetOperation",
+                        "column": "@foo",
+                        "value": "1"
+                    }
+                ],
                 "first": 0,
                 "last": 7
             }