Make LUA Script Conditional on Existence of A Records

Trying to get a lua script together that will filter out AAAA records in
response to client requests, if and only if the result of the original
query returns at least one A record. If the result of the client's request
results in only AAAA records, those AAAA records should be returned to the
client. I have a "filter all AAAA" lua script that strips all AAAA records
implemented in pdns-recursor, but I need to make it meet the conditions
above:

    -- This function strips AAAA (IPv6) records for all domains

    function preventIPv6ForAllDomains(dq)
        -- Only proceed if the query is for AAAA (IPv6) records
        if dq.qtype ~= pdns.AAAA then
            return false  -- If it's not a AAAA query, allow it
        end

        -- Filter out the AAAA query by setting the rcode to 0 (NOERROR)
        dq.rcode = pdns.NOERROR
        return true  -- Indicate that the query was handled
    end

    -- Apply the function to all queries in the preresolve phase
    function preresolve(dq)
        return preventIPv6ForAllDomains(dq)
    end

Thanks!
Jeremy

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