for every command we filter fields and giving few fields to the next command, why eval gives all fields to the next command

[nagarjuna280]

index=* sourcetype=history browser=chrome | eval name="raj" giving output as many fields like sourecetype, browser, host etc...

index=* sourcetype=history browser=chrome |table sourcetype gives only sourcetype

is there any command like eval

[martin_mueller · Accepted solution]

The initial search gives all fields to eval, and eval adds one field to that set.
You can combine commands like this:

index=* sourcetype=history browser=chrome | table sourcetype | eval name="raj"