Add clickhouse-replicated dialect

[chapsuk]

This PR introduces a new clickhouse-replicated dialect, and here’s why it’s needed:

• The ReplicatedMergeTree engine is required.
• The ON CLUSTER clause is a must for CREATE TABLE queries.
• You need to set insert_quorum=2 for inserts and select_sequential_consistency=1 for selects.

These differences between a single-node ClickHouse instance and a replicated cluster are why we’re adding this new dialect.

Added the environment variable GOOSE_CLICKHOUSE_CLUSTER_NAME (default: {cluster}) allows to set Clickhouse cluster name

[funvit]

It is better to make the macro {cluster} configurable, since it is not standard.

[chapsuk]

Hi @funvit! Thanks for the feedback 👍

I understand the concern about the {cluster} macro not being a standard. While it might not be universally recognized, it is widely used when deploying clusters via the Altinity ClickHouse Operator, and it’s also mentioned in the official ClickHouse documentation.

I believe using the {cluster} macro is a good practice because it simplifies cluster management and cluster queries.

Regarding making it configurable, the reason I didn’t pursue that route is due to the current limitations in the implementation of dialects, which don’t support additional settings. To avoid significant changes, something I’d prefer to minimize when adding a new dialect, the most viable approach is to pass the cluster name via an environment variable, like CLICKHOUSE_REPLICATED_CLUSTER_NAME, defaulting to {cluster}.

What do you think - should we keep using the macro as is, or switch to an environment variable? Or maybe there's a better solution I haven't thought of?

[funvit]

Perhaps this macro is standard or recommended, but in tests it would be easier to replace it with some custom value.

For example, now I had to implement Store for an older version of goose, and there I just made a Cluster field for ClickhouseReplicated.

This simplified the tests (using testcontainers), because it was no longer necessary to support the configuration of macros.

[chapsuk]

Thanks for explanation, it makes sense!

I'm added extra env var GOOSE_CLICKHOUSE_CLUSTER_NAME which allows redefine cluster name and added clickhouse-replicated dialect tests. PTAL