SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function divide (children 1)
     ExpressionList (children 2)
      Identifier column_1
      Identifier column_2
    Identifier id
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias T2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 4)
          ExpressionList (children 3)
           Function max (alias column_1) (children 1)
            ExpressionList (children 1)
             Identifier column_1
           Function max (alias column_2) (children 1)
            ExpressionList (children 1)
             Identifier column_2
           Identifier id
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (alias T1) (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 2)
                SelectQuery (children 3)
                 ExpressionList (children 3)
                  Function max (alias column_1) (children 1)
                   ExpressionList (children 1)
                    Identifier column_1
                  Literal NULL (alias column_2)
                  Identifier id
                 TablesInSelectQuery (children 1)
                  TablesInSelectQueryElement (children 1)
                   TableExpression (children 1)
                    TableIdentifier clickhouse_alias_issue_1
                 ExpressionList (children 1)
                  Identifier id
                SelectQuery (children 3)
                 ExpressionList (children 3)
                  Literal NULL (alias column_1)
                  Function max (alias column_2) (children 1)
                   ExpressionList (children 1)
                    Identifier column_2
                  Identifier id
                 TablesInSelectQuery (children 1)
                  TablesInSelectQueryElement (children 1)
                   TableExpression (children 1)
                    TableIdentifier clickhouse_alias_issue_2
                 ExpressionList (children 1)
                  Identifier id
          ExpressionList (children 1)
           Identifier id
          ExpressionList (children 1)
           OrderByElement (children 1)
            Identifier id
   Function and (children 1)
    ExpressionList (children 2)
     Function isNotNull (children 1)
      ExpressionList (children 1)
       Identifier column_1
     Function isNotNull (children 1)
      ExpressionList (children 1)
       Identifier column_2
