This impacts the Grafana plugin.

From https://github.com/grafana/clickhouse-datasource/issues/198


    if an adhoc filter is specified for the field t1_distributed.f2
        the following query will be built by the plugin SELECT f1 from t1_distributed settings additional_table_filters = {'t1_distributed': 'f2 = xxx'}
        this query will actually not do its job of filtering
        i guess it is coming from the fact that additional_table_filters are applied by clickhouse when it reads the table....but distributed tables are not read.....
        if i replace in the built query, within the additional_table_filters settings, t1_distributed with t1_local (so a query like `SELECT f1 from t1_distributed settings additional_table_filters = {'t1_local': 'f2 = xxx'}), then it is working as expected
    i gave a try to add an adhoc filter on the "local" table (while my "main" query is still on the distributed table) (ie define an adhoc filter on the fied t1_local.f2)
        then the built query by the plugin does not include any additional_table_filters settings (i guess there is a check in order to add additional_table_filters only on the table used in the query)




{
    Settings new_settings = settings;
    new_settings.queue_max_wait_ms = Cluster::saturate(new_settings.queue_max_wait_ms, settings.max_execution_time);
    
    
    
    if (cluster.getSecret().empty())
    {
        
        new_settings.max_concurrent_queries_for_user = 0;
        new_settings.max_memory_usage_for_user = 0;
        
        new_settings.max_concurrent_queries_for_user.changed = false;
        new_settings.max_memory_usage_for_user.changed = false;
    }
    if (settings.force_optimize_skip_unused_shards_nesting && settings.force_optimize_skip_unused_shards)
    {
        if (new_settings.force_optimize_skip_unused_shards_nesting == 1)
        {
            new_settings.force_optimize_skip_unused_shards = false;
            new_settings.force_optimize_skip_unused_shards.changed = false;