swapna267 commented on PR #18144:
URL: https://github.com/apache/iceberg/pull/18144#issuecomment-5706423530
why not use ReadOptions and pass when creating the
IcebergFullCachingLookupFunction, which will keep it consistent across task
restarts or job restarts.
At table creation time,
```sql
CREATE TABLE dim_users (
user_id BIGINT,
name STRING,
city STRING
) WITH (
'connector' = 'iceberg',
'catalog-name' = 'iceberg_catalog',
'catalog-type' = 'hadoop',
'warehouse' = '/path/to/warehouse',
'catalog-database' = 'db',
'catalog-table' = 'users',
'lookup.full-cache.eager-load' = 'true',
'snapshot-id' = '121334'
);
```
OR per query
```sql
SELECT o.order_id, o.user_id, u.name, u.city
FROM orders AS o
LEFT JOIN iceberg_catalog.`db`.`users`
/*+ OPTIONS(
'lookup.full-cache.eager-load' = 'true',
'snapshot-id' = '121334'
) */
FOR SYSTEM_TIME AS OF o.proc_time AS u
ON o.user_id = u.user_id;
```
There could be other strategies to simplify , instead of user specifying
exact snapshot id also like latest or specific tag or as-of-timestamp
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