Hi Ambrose,
No java interop. I do a selection based on map keys. Suppose I have a set of
maps:
(def rel #{{:a "a" :b "b"}{:a "c" :b "d"}{:a "e" :b "f"}})
And I do a select-like query
(select rel [[:a :eq "a"]])
=> #{{:a "a" :b "b"}}
Now, I want to distinguish between a value that doesn't match and a
non-existing key.
Hence,
(select rel [[:bogus "b"]]) should not return an empty set but somehow signal
that the key does not exist.
In relational terms, the key is not an attribute of the relation.
Does that make sense?
Andreas
On 20/03/2011, at 9:10 PM, Ambrose Bonnaire-Sergeant wrote:
> curious, why do you want to do this? Are you working with Java interop
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