dbi_get_attr_k to use switch/case?

[Stas Bekman]

As I was looking through DBI.xs, I've noticed that dbi_get_attr_k is a very 
long if/elseif flow. Wouldn't converting it to use switch(*key) (on the first 
letter) make things a bit faster? Or is the Perl overhead so much more 
significant that it doesn't worth the effort?

the only issue is the last else {} block, which I thought could be split of 
and run if valuesv is undef, but I see that at least RowsInCache may set it to 
this value, so this won't work. The alternative solution is use goto() to 
break out ;)

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