A method includes causing display to a user of at least one event of a first result set from a first pipelined search on events at an event source. Each event comprises a time stamp and a portion of machine data. A selection of a command is received from the user. The selection is to extend the first pipelined search with the selected command in a second pipelined search. The system selects between the first result set and the event source for execution of the second pipelined search based on an analysis of the selected command and at least one command of the first pipelined search. Based on the selecting being of the first result set, display to the user is caused of at least one event of a second result set from the execution of the second pipelined search on the first result set.