SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayFilter (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier a
        Function in (children 1)
         ExpressionList (children 2)
          Function tuple (children 1)
           ExpressionList (children 2)
            Identifier a
            Function arrayJoin (children 1)
             ExpressionList (children 1)
              Function array (children 1)
               ExpressionList
          Function tuple (children 1)
           ExpressionList (children 2)
            Literal NULL
            Literal Array_[NULL]
      Function array (children 1)
       ExpressionList