SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 5)
   ExpressionList (children 1)
    Identifier i
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier a
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier _part_offset
     Literal UInt64_2
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier i
   Set
