rxDataStep cannot change type of existing variable

[hongooi73]

Even when writing to a new file:

> mtx <- rxDataStep(mtcars, "mtcars.xdf", overwrite=TRUE)

> z <- rxDataStep(mtx, "mtcarsz.xdf", transforms=list(am=as.character(am)), overwrite=TRUE)

> rxGetVarInfo(z)
Var 1: mpg, Type: numeric, Low/High: (10.4000, 33.9000)
Var 2: cyl, Type: numeric, Low/High: (4.0000, 8.0000)
Var 3: disp, Type: numeric, Low/High: (71.1000, 472.0000)
Var 4: hp, Type: numeric, Low/High: (52.0000, 335.0000)
Var 5: drat, Type: numeric, Low/High: (2.7600, 4.9300)
Var 6: wt, Type: numeric, Low/High: (1.5130, 5.4240)
Var 7: qsec, Type: numeric, Low/High: (14.5000, 22.9000)
Var 8: vs, Type: numeric, Low/High: (0.0000, 1.0000)
Var 9: am, Type: numeric, Low/High: (0.0000, 1.0000)  <--- wrong
Var 10: gear, Type: numeric, Low/High: (3.0000, 5.0000)
Var 11: carb, Type: numeric, Low/High: (1.0000, 8.0000)

[hongooi73]

This only seems to affect numeric -> character. Transforming character -> numeric works:

> out <- rxDataStep(mtx, "temp.xdf", transforms=list(a=as.character(seq_len(.rxNumRows))))
> rxGetVarInfo(out)
...
Var 12: a, Type: character

> out2 <- rxDataStep(out, "temp2.xdf", transforms=list(a=as.numeric(a)))
> rxGetVarInfo(out2)
...
Var 12: a, Type: numeric, Low/High: (1.0000, 32.0000)

[hongooi73]

TFS item 78049