SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayExists (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier x
        Function notEquals (children 1)
         ExpressionList (children 2)
          Identifier x
          Literal \'\'
      Literal Array_[NULL, \'arrayExists\']
