haizhou-zhao opened a new issue, #8832:
URL: https://github.com/apache/iceberg/issues/8832
### Apache Iceberg version
main (development)
### Query engine
Other
### Please describe the bug 🐞
Currently, JdbcCatalog relies on this sql statement to check whether a
namespace exists:
`"SELECT TABLE_NAMESPACE FROM CATALOG_TABLE_NAME WHERE CATALOG_NAME = {}
AND TABLE_NAMESPACE LIKE {}% LIMIT 1"`
It gives undesired result in this scenario:
1. Create a namespace `my_ns`
2. Create a namespace `my_ns_1`
3. Create a table `my_ns_1.tbl1`
4. Drop namespace `my_ns`
5. Check namespace exists on `my_ns` will return true, which should have
been false
It happens because, at step 5, `my_ns_1` still exists and matches query
`"SELECT TABLE_NAMESPACE FROM CATALOG_TABLE_NAME WHERE CATALOG_NAME = jdbc
AND TABLE_NAMESPACE LIKE my_ns% LIMIT 1"`. I believe the root cause is that
particular sql statement, with regex like "my_ns%", cannot different between
"my_ns" and "my_ns_1".
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