Allow the use of `..var` in i

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
r
Domain
data

Research direction

Start by reproducing the supplied R examples, comparing how ..x is handled in j with the failing evaluation in i. Trace the i entry point and its name lookup behavior; done means test_df[y < ..x] works as shown without regressing the existing j behavior.

Written by the indexing model from the issue text.

Description

programming

It would be useful if this was possible for use in i, much like it is possible to use in j:

library(data.table)

test_df <- data.table(x = 1:3, y = 1:3)
x <- 3

# Works in j
copy(test_df)[, new := y + ..x][]
#>    x y new
#> 1: 1 1   4
#> 2: 2 2   5
#> 3: 3 3   6

# Fails in i
test_df[y < ..x]
#> Error in .checkTypos(e, names_x): Object '..x' not found amongst x, y
Dominant language
R
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