SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arraySplit (children 1)
     ExpressionList (children 3)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Identifier x
          Identifier y
        Identifier y
      Literal Array_[UInt64_1, UInt64_2, UInt64_3, UInt64_4, UInt64_5]
      Literal Array_[UInt64_1, UInt64_0, UInt64_0, UInt64_1, UInt64_0]