`by` could accepted a named vector to set names when it's a character vector
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Start by tracing how the by argument handles character vectors and named expressions, using the examples in the issue as the target behavior. Then inspect the related .SDcols handling and existing tests, if available. Done means the named-vector form gives the requested grouping names and any .SDcols behavior is explicitly resolved with coverage.
Written by the indexing model from the issue text.
Description
require(data.table)
dt = data.table(x=c(1,1,2,2), y=1, z=2)
dt[, sum(y), by=.(xx = x)] # possible to name columns in by when using .()
dt[, sum(y), by=c(xx="x")] # could work as well
The same could be used for .SDcols as well in case of aggregations.. perhaps.
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- Open a pull request that references the issue number.
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