AlterQuery  sj_a (children 2)
 ExpressionList (children 1)
  AlterCommand ADD_STATISTICS (children 1)
   Stat (children 2)
    ExpressionList (children 1)
     Identifier id
    ExpressionList (children 1)
     Function Uniq (children 1)
      ExpressionList
 Identifier sj_a
