[datatable-help] Unexpected behavior in setnames()

[Alexandre Sieira]

I found this behavior during a debugging session: 

> d = data.table(a=1, b=2, c=3)
> setnames(d, "a", "b")
> d
   b b c
1: 1 2 3

Shouldn’t setnames() check if the new column names already exist before renaming, and signal an error or at least a warning if they do?

-- 
Alexandre Sieira
CISA, CISSP, ISO 27001 Lead Auditor

"The truth is rarely pure and never simple."
Oscar Wilde, The Importance of Being Earnest, 1895, Act I
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