Suggestion : Addition of GridFieldStreamExportButton.php

[ccordina]

I bumped into some issues when i need to export over 10K of rows being displayed in a gridfield. I was currently using the implmentation suggested here :
https://stackoverflow.com/questions/17502299/how-to-export-all-rows-as-csv-in-modeladmin-silverstripe-3-1
but it triggered Allowed memory exhausted php error. After researching a bit more i found this class :

https://gist.github.com/stecman/4208abcc2704a97d4337ddfa30572495

which solved my issue. I would suggest that it should be added to the gridfieldextensions module. It is beneficial for those who display large amounts of data and want to export it.