1. A method for processing log data, comprising: receiving log data that comprises a plurality of events, wherein an event includes a set of fields, and wherein a field stores a value; and for each event in the plurality of events: storing the event in a set of buffers, wherein each field of the event is associated with a different buffer; and updating a metadata structure that comprises information about contents of the buffers, wherein information about contents of the buffers includes a first minimum value that reflects a minimum value of a first field of all of the events stored in the buffers.