[Rpm-maint] [rpm-software-management/rpm] RFE: Handle disttag (#589)

[Jeff Johnson]

I should point out that there are far bigger issues than the separator if DistTag is incorporated as a package identifier:

1) precedence of comparison: is it EVRD (as is common with %{?dist} usage) or is it DEVR (as some might wish)

2) interoperability when mixtures of packages are installed with/without DistTag.

3) the dbiFindByLabelFoo() reads every package header in Packages (~100Mb), possibly multiple times, trying various matches. The proper way to perform a query like this is to create indices for each field and do a join to minimize the amount of data that must be read. A change to an rpmdb of that magnitude is highly unlikely.

(aside)
There is also the issues of patterns in queries: a join will not solve that problem. RPM5 uses a btree with a prefix key to find candidates to retrieve rather than retrieving every header. But I digress ...

Warning:
My comments here will be deleted within a week: I have negative interest in participating in a DistTag discussion that I have already had, and already implemented. Have fun!

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