stackoverflow March 29, 2026 Rep: 8,726

Combination of dplyr and data.table silently breaks table structure

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March 29, 2026 Score: 5 Rep: 23,209 Quality: Medium Completeness: 80%

Basically this is a collision between R's copy-on-modify and data.table's modify-by-reference.

Let's assign a copy of dtoriginal to dtnew.

dt_new

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