QuestDB support

[glasstiger]

QuestDB support.

Test class uses testcontainers (https://java.testcontainers.org/) which requires docker.

[glasstiger]

Hi!
This PR adds support for QuestDB, and would really appreciate any feedback on the code changes.
If you have few minutes to spare, please, take a look.
Thank you in advance for your time!

[glasstiger]

Hi @piers-williams, @WilliamL-RG, @alistair-RG!
Do you, guys, have an idea when you can take a look at the PR?

Please, let me know if I can help the review process in any way.
By creating a repo with a demo project, for example?

[nwoolmer]

Hey @piers-williams, @WilliamL-RG, @alistair-RG ,

We have some Flyway users who need this plugin, and we are happy to turn things around quickly if there are any issues with the PR. Please could you let us know what is needed, and if you have any idea of a rough ETA, if you are happy to accept it?

Thank you!

[piers-williams]

At present, this will conflict with the standard Postgresql database implementation. Is there anything that can be done to differentiate QuestDB from Postgresql? If there is, then also please override getPriority and return 1 to check QuestDB before Postgresql

[glasstiger]

QuestDB implements the Postgres Wire Protocol, and does not have its own driver.
The driver's metadata will always say that it is a Postgres connection, databaseProductName will be always PostgreSQL.
See https://github.com/pgjdbc/pgjdbc/blob/7b1984b25590171906c96687bc99d7aeaa7a8000/pgjdbc/src/main/java/org/postgresql/jdbc/PgDatabaseMetaData.java#L162

databaseProductVersion does not help either, because QuestDB returns with the Postgres server version it is compatible with.

It is impossible to distinguish between a Postgres and a QuestDB connection without talking to the server.
I will use the connection to query for the catalog version of the server, if that is ok.
That should return with something like:

PostgreSQL 12.3, compiled by Visual C++ build 1914, 64-bit, QuestDB"

This will tell if the server is a QuestDB instance or not.

[glasstiger]

Change implemented in dd1aef2

[piers-williams]

Awesome thanks - one last set of changes to use FlywayException and I think this will be good to go!

[glasstiger]

Awesome thanks - one last set of changes to use FlywayException and I think this will be good to go!

Accepted the commit suggestions.
Thank you.

[glasstiger]

Thank you for merging the PR, @piers-williams !

Noticed this error during build:
https://github.com/flyway/flyway-community-db-support/actions/runs/16195516962/job/45720906344

I wonder if you need to migrate to the new maven release plugin.
We had to make these changes in our project recently to be able to release:
https://github.com/questdb/questdb/pull/5901/files