cbindlist could support retaining merged keys across inputs
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 35/100
Research direction
Start with the failing test referenced in the issue and inspect the cbindlist implementation and key-handling behavior in data.table. Determine how keys from inputs a and b are currently treated, then confirm that the output preserves the merged key and that the new test passes.
Written by the indexing model from the issue text.
Description
This new test fails, but I'd expect it to pass -- why wouldn't we be able to assume the output is also keyed by a,b?
Originally posted by @MichaelChirico in https://github.com/Rdatatable/data.table/pull/6435#discussion_r2175882100
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