Johannes Edmeier 87a2ac5b5c GH-8760 Postgres: using DELETE ... RETURNING ...

Fixes https://github.com/spring-projects/spring-integration/issues/8760

* Make `PostgresChannelMessageStoreQueryProvider` to use single `DELETE ... RETURNING` for polling statements
* Add `isUsingSingleStatementForPoll` and use it from `JdbcChannelMessageStore`
* Execute Postgres init scripts to `PostgresContainerTest`
* Code clean up
* Document the new feature

2023-10-17 11:26:46 -04:00

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GH-8760 Postgres: using DELETE ... RETURNING

2023-10-17 11:26:46 -04:00