Why is this not recognising the Clickhouse calls?

It's because the instrumentation cannot recognize the database you are connecting to.

@Srikanth Chekuri But it is able to recognize the PostgresDb, so what should I do to make ClickHouse calls recognizable?

You should send a PR to the instrumentation library to make it recognizable https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/instrumentation