adding an atime test case; new with optimization to allow avoid [ overhead #PR4488 #6289
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This regression was reported in #3735. They reported that selecting by row number from a data.table is much slower than from a data.frame.
The pull request that fixed the regression can be found #4488. However, I couldn’t find specific details about the changes made to fix the regression. It’s likely that the changes involved optimizing the way data.table handles row selection to make it more efficient.