Closed QubitPi closed 4 years ago
It's documented but poorly.
Basically instead of using lookup
with the lookup extraction definition you specify name
as the name of a registered lookup.
The 2 options are mutually exclusive, if name
is specified then the LookupReferencesManager will be called to build the extraction function, otherwise lookup
is used.
The language on that page isn't great, if I have some time I might try make it clearer.
It should also be more clear how to use them on this page too: http://druid.io/docs/latest/querying/lookups.html
Good point. @QubitPi, @josephglanville, are either of you interested in updating the docs to be clearer?
@josephglanville , @gianm Thank you for the update. My team uses registered lookup and I have experience developing Druid extensions on top of it. I can find some time as soon as possible to update the doc.
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I found doc for Lookup DimensionSpecs in drui.io/docs/latest/querying/dimensionspecs.html, but not for RegisteredLookup