**Describe the bug**
`sync` here is a pointer to a global `sync` function implicitly converted to a bool:

https://github.com/ClickHouse/ClickHouse/blob/624ccd5206a7be7c8a56f2f7590e13d57a074008/src/Databases/DatabaseReplicated.cpp#L797

**How to reproduce**
compile `master` or `v22.8.4.7-lts` with warnings enabled

**Error message and/or stacktrace**


{
    auto txn = local_context->getZooKeeperMetadataTransaction();
    assert(!ddl_worker->isCurrentlyActive() || txn);
    if (txn && txn->isInitialQuery() && attach)
    {
        String metadata_zk_path = zookeeper_path + "/metadata/" + escapeForFileName(table_name);
        String statement = readMetadataFile(table_name);
        txn->addOp(zkutil::makeCreateRequest(metadata_zk_path, statement, zkutil::CreateMode::Persistent));
    }
    std::lock_guard lock{metadata_mutex};
    UInt64 new_digest = tables_metadata_digest;
    if (attach)
    {
        new_digest += getMetadataHash(table_name);
        if (txn)
            txn->addOp(zkutil::makeSetRequest(replica_path + "/digest", toString(new_digest), -1));
    }
    DatabaseAtomic::removeDetachedPermanentlyFlag(local_context, table_name, table_metadata_path, attach);
    tables_metadata_digest = new_digest;
    assert(checkDigestValid(local_context));
}
String DatabaseReplicated::readMetadataFile(const String & table_name) const