Hash joins

[David Kincaid]

I was looking through the operations.clj again today and came across the hash-join* function. That is exactly what I need right now. Is it possible to use this in a Cascalog query somehow? I'm not sure how to do it since the first argument is "flows" so I'm not sure how to get that in there. Anyone using hash-joins in Cascalog?

Thanks,

Dave

[Sam Ritchie]

Hey, I don't have an example handy right now, but you can actually pass a Cascalog query in to any place that asks for a flow. Check the tests out for how to use that function, and just swap in your Cascalog query for the flow example.

Then, you can use the result as a Cascalog query in the next part of your job.

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[David Kincaid]

I see. That makes sense. So create two Casacalog queries, one for each side of the join, use hash-join* to join them and use the result in another query (or sink the result). I'll give it a shot!

Thanks,

Dave

[Igor Postelnik]

How did this work out for you?

[David Kincaid]

Works great!  I was able to get it working and it is really amazing. The queries I've used it in run so much faster.

- Dave