Move the check about missing assignment in SET operation to focus UPD…

…ATE statements only.

src/Components/SetOperation.php

@@ -139,11 +139,6 @@ public static function parse(Parser $parser, TokensList $list, array $options =
             $parser->error('Unexpected token.', $commaLastSeenAt);
         }
 
-        // We got a SET operation without any assignment
-        if ($ret === []) {
-            $parser->error('Missing assignment in SET operation.', $list->tokens[$list->idx]);
-        }
-
         return $ret;
     }
 

src/Statements/UpdateStatement.php

@@ -10,7 +10,11 @@
 use PhpMyAdmin\SqlParser\Components\Limit;
 use PhpMyAdmin\SqlParser\Components\OrderKeyword;
 use PhpMyAdmin\SqlParser\Components\SetOperation;
+use PhpMyAdmin\SqlParser\Exceptions\ParserException;
+use PhpMyAdmin\SqlParser\Parser;
 use PhpMyAdmin\SqlParser\Statement;
+use PhpMyAdmin\SqlParser\Token;
+use PhpMyAdmin\SqlParser\TokensList;
 
 /**
  * `UPDATE` statement.
@@ -135,4 +139,23 @@ class UpdateStatement extends Statement
      * @var JoinKeyword[]|null
      */
     public $join;
+
+    /**
+     * Function called after the token was processed.
+     * In the update statement, this is used to check that at least one assignment has been set to throw an error if a
+     * query like `UPDATE acme SET WHERE 1;` is parsed.
+     *
+     * @throws ParserException
+     */
+    public function after(Parser $parser, TokensList $list, Token $token)
+    {
+        /** @psalm-var string $tokenValue */
+        $tokenValue = $token->value;
+        // Ensure we finished to parse the "SET" token, and if yes, ensure that assignments are defined.
+        if ($this->set !== [] || (Parser::$KEYWORD_PARSERS[$tokenValue]['field'] ?? null) !== 'set') {
+            return;
+        }
+
+        $parser->error('Missing assignment in SET operation.', $list->tokens[$list->idx]);
+    }
 }

tests/data/parser/parseUpdate3.out

@@ -243,6 +243,13 @@
                     "@type": "@12"
                 },
                 0
+            ],
+            [
+                "Missing assignment in SET operation.",
+                {
+                    "@type": "@11"
+                },
+                0
             ]
         ]
     }