SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function uniqForEach (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 4)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function emptyArrayUInt8 (alias x) (children 1)
            ExpressionList
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal Array_[UInt64_1, UInt64_2, UInt64_3]
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function emptyArrayUInt8 (children 1)
            ExpressionList
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal Array_[UInt64_2, UInt64_2]