In order to diagnose query engine-related problems, we would often like users to enable logLevel 1 specifically for the QUERY log component. However, this also causes every query operation to generate a log line. This is much too verbose for many users, which makes collecting query-related diagnostics impossible. In order to fix this, we should consider moving the per-operation debug lines to either an existing log component (kDefault? kCommand?) or a new log component.