it should be the largest index that is less than or equal to the key you are
looking up.
The use case in mind for this feature was the maxmind GeoIP database, which
converts the IP addresses into 32bit integers and lists the first IP of each
block
so when you lookup an IP address, convert it to a 32 bit integer and then you
want the largest item that's not larger than what you are looking up.
David Lang
On Tue, 2 Feb 2021, Mariusz Kruk via rsyslog wrote:
Date: Tue, 2 Feb 2021 14:21:55 +0100
From: Mariusz Kruk via rsyslog <[email protected]>
To: [email protected]
Cc: Mariusz Kruk <[email protected]>
Subject: [rsyslog] sparseArray documentation
Hi.
I'm reading
https://www.rsyslog.com/doc/master/configuration/lookup_tables.html and I
believe there's some mistake with wording regarding sparse arrays.
Quoting: "*Match criterion*: A match happens on the first index that is less
than or equal to the looked-up key."
If it were so, if I started my table on index=0, every single match should
happen on this value since it's obviously less than or equal to any looked-up
integer. So, judging from the example (and from what I'd expect it to be)
it's rather that match happens on the first index that is bigger than or
equal, not less than or equal.
And, for the sake of completness, it would be great to include info that
sparseArray should also consist of monotonic indexes. I assume that the
author assumed "inheritance" from previous paragraph describing normal array.
Best regards,
MK
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