N/search Module
ResultSet.columns
Property Description: An array of search.Column objects that represent the columns returned in the search results.
Type: search.Column[] This property is read-only
Supported Script Types: All script types For more information, see SuiteScript 2.0 Script Types.
Module: N/search Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=ResultSet.columns

// Code Example 1

//Add additional code

//...

 var mySearch = search.load({

    id: 'customsearch_my_so_search'

  });



  var resultSet = mySearch.run();

  log.debug({

    details: "There are " + resultSet.columns.length + " columns in the result set:"

    });



  resultSet.columns.forEach(function(col){ // log each column

    log.debug({

        details: col

    });

  });

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_456520019530.html