SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function arrayDistinct (children 1)
     ExpressionList (children 1)
      Literal Array_[UInt64_1, UInt64_2, NULL, UInt64_5, UInt64_2, NULL]
