liuml07 opened a new pull request, #4:
URL: https://github.com/apache/flink-connector-jdbc/pull/4
## What is the purpose of the change
Currently the `PostgresCatalog#listTables()` creates a new connection and
prepared statement for every schema and table when listing tables. This can be
optimized by reusing those resources.
## Brief change log
*(for example:)*
- Introduce `extractColumnValuesByStatement` in base class
`AbstractJdbcCatalog`
- Reuse connection and prepared in `PostgresCatalog#listTables()`
This is moved from apache/flink#21146
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