I am new to clojure but learning quickly. I haven't yet tried
clojure.contrib.Datalog, but I analyze big data and I can say that I
quite like Nathan Marz's Cascalog. Cascalog is reminiscent of datalog
syntax but executes queries on Hadoop via Cascading for data that is
too big to fit in memory.
Hi,
On Jul 13, 4:02 am, Wilson MacGyver wrote:
> Has anyone used clojure.contrib.Datalog for anything serious? What
> kind of problem
> did you run into if any?
I considered using it, but I could never figure out, how to use it
correctly. eg. what predicates are available? Can I define my own?
I've added some Datalog material to the wiki:
http://code.google.com/p/clojure-contrib/wiki/DatalogOverview
On Wed, Feb 18, 2009 at 4:55 PM, Jeffrey Straszheim <
straszheimjeff...@gmail.com> wrote:
> Makes sense. That would work. It certainly looks cleaner.
>
>
> On Wed, Feb 18, 2009 at 4:51 P
Makes sense. That would work. It certainly looks cleaner.
On Wed, Feb 18, 2009 at 4:51 PM, Rich Hickey wrote:
>
>
>
> On Feb 18, 4:32 pm, Jeffrey Straszheim
> wrote:
> > Easy enough to do. The only drawback is I'd probably want to force it
> into
> > a hash during the query. For large datas
On Feb 18, 4:32 pm, Jeffrey Straszheim
wrote:
> Easy enough to do. The only drawback is I'd probably want to force it into
> a hash during the query. For large datasets (say 100,000 records) this
> might get expensive.
>
What I envisioned was that while this was the logical db, 'inserting'
a
Easy enough to do. The only drawback is I'd probably want to force it into
a hash during the query. For large datasets (say 100,000 records) this
might get expensive.
On Wed, Feb 18, 2009 at 4:13 PM, Rich Hickey wrote:
>
>
>
> On Feb 18, 3:51 pm, Jeffrey Straszheim
> wrote:
> > Yes. I've bee
On Feb 18, 3:51 pm, Jeffrey Straszheim
wrote:
> Yes. I've been thinking about a database layer that would support indexing,
> constraints, and so on. One step at a time.
Maybe I wasn't clear, I'm talking about the foundational layer.
Instead of:
(def data {
:table-1 #{ { :x 34 :y 33 } { :
Yes. I've been thinking about a database layer that would support indexing,
constraints, and so on. One step at a time.
(logic-rule (:fred :x ?x :y ?y) - (:sally :x ?x :z ?z) ("becky" :y ?y)
(not! :janet :qqq ?z) (if < ?x ?y))
Translated into positional notatio
On Feb 9, 8:46 am, Jeffrey Straszheim
wrote:
> No, but I'm really learning as I go here. I'll look into it.
>
> On Mon, Feb 9, 2009 at 7:58 AM, Rich Hickey wrote:
>
> > Looks like you're moving apace!
>
> > Have you considered query/subquery optimization instead of magic sets?
>
> > Rich
>
>
No, but I'm really learning as I go here. I'll look into it.
On Mon, Feb 9, 2009 at 7:58 AM, Rich Hickey wrote:
>
> Looks like you're moving apace!
>
> Have you considered query/subquery optimization instead of magic sets?
>
> Rich
>
> On Feb 8, 7:51 pm, Jeffrey Straszheim
> wrote:
> > By the
Looks like you're moving apace!
Have you considered query/subquery optimization instead of magic sets?
Rich
On Feb 8, 7:51 pm, Jeffrey Straszheim
wrote:
> By the way, if anyone on this list has experience implementing bottom-up
> optimizations for logic programs, particularly from the magic se
By the way, if anyone on this list has experience implementing bottom-up
optimizations for logic programs, particularly from the magic set family,
and is willing to assist, please contact me.
On Sun, Feb 8, 2009 at 7:47 PM, Jeffrey Straszheim <
straszheimjeff...@gmail.com> wrote:
>
> Stratified n
Stratified negation is working and in trunk.
I have some cool ideas of a simple, but powerful, way to implement
evaluable predicates. They'll likely make it in by midweek.
The the hard part (magic sets) begins.
On Feb 8, 11:43 am, Jeffrey Straszheim
wrote:
> I now have recursive queries worki
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