AlterQuery  mt_with_pk (children 3)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Literal UInt64_1
   ExpressionList (children 1)
    Assignment y (children 1)
     Literal Array_[\'q\', \'q\', \'q\']
 Identifier mt_with_pk
 Set
