SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function CAST (alias map) (children 1)
     ExpressionList (children 2)
      Function tuple (children 1)
       ExpressionList (children 2)
        Literal Array_[UInt64_2, UInt64_1, UInt64_1023]
        Literal Array_[\'\', \'\']
      Literal \'Map(UInt8, String)\'
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Identifier map
      Literal UInt64_10
