Add sql_translation method for duckdb

[ablack3]

Using this branch the issue with duckdb dplyr sql translation seems fixed. #324

connectionDetails <- Eunomia::getEunomiaConnectionDetails(dbms = "duckdb")


connection <- DatabaseConnector::connect(connectionDetails)
#> Connecting using DuckDB driver


visit <- dplyr::tbl(connection, "visit_occurrence")

visit |> 
  dplyr::transmute(visit_start_date, new_date = clock::add_years(visit_start_date, 1L))
#> # Source:   SQL [?? x 2]
#> # Database: DatabaseConnectorDbiConnection
#>    visit_start_date new_date           
#>    <date>           <dttm>             
#>  1 1996-08-21       1997-08-21 00:00:00
#>  2 1988-03-28       1989-03-28 00:00:00
#>  3 2012-05-14       2013-05-14 00:00:00
#>  4 2003-09-14       2004-09-14 00:00:00
#>  5 1976-03-04       1977-03-04 00:00:00
#>  6 1999-02-14       2000-02-14 00:00:00
#>  7 1998-09-14       1999-09-14 00:00:00
#>  8 1980-07-22       1981-07-22 00:00:00
#>  9 2003-09-12       2004-09-12 00:00:00
#> 10 2008-04-27       2009-04-27 00:00:00
#> # ℹ more rows

DatabaseConnector::disconnect(connection)

^{Created on 2025-12-30 with reprex v2.1.1}

[schuemie]

Thanks @ablack3 ! Would you mind adding some comments to the code to explain why this is necessary? Else I think a year from now we'll all be scratching our heads when we see it ;-)

[ablack3]

Hi @schuemie yes good idea.

I've added a few comments. It looks like the tests fail because the iris test database is not reachable.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 56.36%. Comparing base (0d00a30) to head (d776553).
⚠️ Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
R/backend-DatabaseConnector.R	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #325      +/-   ##
===========================================
+ Coverage    56.33%   56.36%   +0.02%     
===========================================
  Files           16       16              
  Lines         2721     2725       +4     
===========================================
+ Hits          1533     1536       +3     
- Misses        1188     1189       +1     

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