testreg=# CREATE TABLE regaoty(i INT) WITH (appendonly=true);
NOTICE:  Table doesn't have 'DISTRIBUTED BY' clause -- Using column named 'i' as the Greenplum Database data distribution key for this table.
HINT:  The 'DISTRIBUTED BY' clause determines the distribution of data. Make sure column(s) chosen are the optimal data distribution key to minimize skew.
CREATE TABLE
testreg=# INSERT INTO regaoty SELECT * FROM generate_series(1, 100000);
INSERT 0 100000
testreg=# SELECT * FROM yezzey_define_offload_policy('regaoty');
NOTICE:  yezzey: relation virtual size calculated: 0  (seg0 slice1 127.0.1.1:6002 pid=3387006)
NOTICE:  yezzey: relation virtual size calculated: 0  (seg1 slice1 127.0.1.1:6003 pid=3387008)
NOTICE:  yezzey: relation virtual size calculated: 0  (seg2 slice1 127.0.1.1:6004 pid=3387007)
INFO:  yezzey: relation segment reached external storage (blkno=1), up to logical eof 332656  (seg2 slice1 127.0.1.1:6004 pid=3387007)
INFO:  yezzey: relation segment reached external storage (blkno=1), up to logical eof 333816  (seg1 slice1 127.0.1.1:6003 pid=3387008)
INFO:  yezzey: relation segment reached external storage (blkno=1), up to logical eof 335168  (seg0 slice1 127.0.1.1:6002 pid=3387006)
 yezzey_define_offload_policy 
------------------------------
 
(1 row)

testreg=# SELECT * FROM yezzey_relation_describe_external_storage_structure('regaoty');
 offload_reloid | segindex | segfileindex |                                             external_storage_filepath                                             | local_b
ytes | local_commited_bytes | external_bytes 
----------------+----------+--------------+-------------------------------------------------------------------------------------------------------------------+--------
-----+----------------------+----------------
          16436 |        1 |            1 | segments_005/seg1/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_1_xlog_202399496 |        
   0 |                    0 |         333816
          16436 |        0 |            1 | segments_005/seg0/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_1_xlog_202400928 |        
   0 |                    0 |         335168
          16436 |        2 |            1 | segments_005/seg2/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_1_xlog_202398256 |        
   0 |                    0 |         332656
(3 rows)

testreg=# begin;
BEGIN
testreg=# INSERT INTO regaoty SELECT * FROM generate_series(1, 100000);
INSERT 0 100000
testreg=# rollback;
ROLLBACK
testreg=# SELECT * FROM yezzey_relation_describe_external_storage_structure('regaoty');
 offload_reloid | segindex | segfileindex |                                             external_storage_filepath                                             | local_b
ytes | local_commited_bytes | external_bytes 
----------------+----------+--------------+-------------------------------------------------------------------------------------------------------------------+--------
-----+----------------------+----------------
          16436 |        0 |            1 | segments_005/seg0/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_1_xlog_202400928 |        
   0 |                    0 |         335168
          16436 |        0 |            1 | segments_005/seg0/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_2_xlog_202429000 |        
   0 |                    0 |         335168
          16436 |        1 |            1 | segments_005/seg1/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_1_xlog_202399496 |        
   0 |                    0 |         333816
          16436 |        1 |            1 | segments_005/seg1/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_2_xlog_202427568 |        
   0 |                    0 |         333816
          16436 |        2 |            1 | segments_005/seg2/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_1_xlog_202398256 |        
   0 |                    0 |         332656
          16436 |        2 |            1 | segments_005/seg2/basebackups_005/yezzey/1663_16384_cc4d049f7c33629b9daf977c154ae465_16385_1__DY_2_xlog_202426328 |        
   0 |                    0 |         332656
(6 rows)