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_1, UInt64_2, UInt64_3]
        Literal Array_[\'1\', \'2\', \'foo\']
      Literal \'Map(UInt8, String)\'
    Function arrayElement (children 1)
     ExpressionList (children 2)
      Identifier map
      Literal UInt64_1
