If you are certain that a warning is spurious, you can disable it locally using no warnings;. It is generally considered good form to disable warnings in as small a scope as possible and to only disable the known spurious warning. In this case, the warning is once (see Category Hierarchy in perllexwarn), so you could use the code:

no warnings "once";
my %q= %SQL_Wrapper::q;
use warnings;
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or you could use a do, which is what I usually use in this sort of scenario

my %q= do{
    no warnings "once";
    %SQL_Wrapper::q;
};
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