Revisit implementation of mergepair requiring obscure logic to generate mult="error" condition
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Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 25/100
Research direction
Read the linked discussion and trace the internal path involving dtmerge(), mergepair, and bmerge(). Compare the alternatives for generating the mult="error" condition; done would require a clearly chosen and agreed implementation direction.
Written by the indexing model from the issue text.
Description
this design (wiring up dtmerge() to accept a single codepath invoked from another internal helper that maybe triggers an error from bmerge()) feels really suboptimal, what are the alternatives?
Originally posted by @MichaelChirico in https://github.com/Rdatatable/data.table/pull/6437#discussion_r2178480841
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