New Argument: "join". Objective: ANSI SQL Syntax

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
r
Domain
databases

Research direction

Start from the proposed x[i, j, by, ..., join = 'default'] entry point and compare the existing X[Y] behavior with X[Y, nomatch=0]. Define how the left, right, inner, and outer values should correspond to ANSI SQL semantics, including the unspecified cases. Done means the new argument supports the listed modes without changing the default joining syntax.

Written by the indexing model from the issue text.

Description

feature request joins top request

Could data.table add a new argument, "join", that instead of using the 'deafult' data.table's own joining syntax, uses that of ANSI SQL.

x[i, j, by, ..., join = 'default']

Where join = c('default', 'left', 'right', 'inner', 'outer').

So that:

  • join = 'left' behaves like X[Y]
  • join = 'inner' behaves like X[Y, nomatch=0]
  • ...

Thank you!

Dominant language
R
Stars
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Forks
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Avg merge
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Merged PRs (30d)
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