Re: [Metakit] data structure question

[Brian Kelley]

Gordon McMillan wrote:

I don't really grasp what you're trying to do, but 2 things come
to mind: 
1) view.rename("value", "newvalue") might help
2) tmp = vw[:] will turn a ROViewer into a (in memory) View, so you
could add a column.
 

Hmm, on metakit 2.4.9.3 this returns a Read only view.  vw.copy() 
returns an in-memory view.

As Gordon was saying, you could try this.

prop = metakit.property("S", "type")

t = vw.flatten(vw.new).copy()
t.addproperty(prop)
for row in t:
     row.type = "new"
t2 = vw.flatten(vw.old).copy()
t2.addproperty(prop)
for row in t2:
     row.type = "old"
metakit.dump(t.union(t2).project(t.id, t.key, t.val, t.type))

I wouldn't worry too much about processing time - what you're
doing is already pretty intensive.
-- Gordon

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