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 greater (children 1)
         ExpressionList (children 2)
          Function position (children 1)
           ExpressionList (children 2)
            Identifier x
            Literal \'a\'
          Literal UInt64_0
      Literal Array_[\'a\']
