I need to know all differences between append, appendcols, and join when being used with pipe while searching in xml file.
Also, I need to know the effect of every command in the performance and if any of them causes interference between events.
append: append will place the values at the bottom of your search in the field values that are the same. for instance, if you have count in both the base search and append search, your count rows will be added to the bottom. i believe this acts as more of a full outer join when used with stats to combine rows together after the append http://docs.splunk.com/Documentation/Splunk/6.5.1/SearchReference/Append