I'm using ag-grid in my application and want to have a row have child rows that expand when clicked (similar to master/detail, row grouping, or tree data). However, all of these are enterprise features. Is there a way to achieve similar functionality without an enterprise license?
Unfortunately, no.
But depending on what you are trying to accomplish, you might be able to fake grouping visually using full width rows:
https://www.ag-grid.com/javascript-grid-full-width-rows/#detailed-full-width-example