@Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof ConnectionPoolId)) {
            return false;
        }
        ConnectionPoolId that = (ConnectionPoolId) o;
        return Objects.equals(host, that.host)
                && Objects.equals(port, that.port)
                && Objects.equals(username, that.username);
    }
The connection pool identifier.
Copy from com.ververica:flink-cdc-base:2.3.0.
inlong-sort/sort-flink/cdc-base/src/main/java/org/apache/inlong/sort/cdc/base/relational/connection/ConnectionPoolId.java