SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 6)
    Identifier a
    Identifier b
    Identifier c
    Identifier d
    Identifier _part_index
    Identifier _part_offset
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier optimize_lazy_materialization
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier c
   Literal UInt64_3
