https://github.com/Rdatatable/data.table/pull/4491 this is the pr which introduced the performance regression
please make a PR from your_data.table/this_branch to your_data.table/old_master
make sure there is a performance test for this case so we will see the regression
@Anirban166
Closing this since it's done (completed here for the PR you mentioned or #4491 + we got another historical regression example here, which replicates #4440)
https://github.com/Rdatatable/data.table/pull/4491 this is the pr which introduced the performance regression please make a PR from your_data.table/this_branch to your_data.table/old_master make sure there is a performance test for this case so we will see the regression @Anirban166