Github user ottobackwards commented on the issue:
https://github.com/apache/incubator-metron/pull/293
I took this jira to get some start of an idea about Stellar, and after
debugging through it to track down to exitVariable to find the argument
resolution and then back up to the validate x->null I would say I got what I
bargained for.
I am not sure how I would answer your question on validation, I don't know
Stellar well enough. My experience and intuition tells me that running the
'execute' and using an exception or error case as validation is not very
efficient at runtime, if in fact this is what happens at runtime as well.
Better to have real metadata on the function and just validating the metadata
and they syntax of the query I would think. *A logical/runtime error does not
mean an invalid expression*. This method is in effect equating them which I
think is incorrect ( unless I am mistaking the intent of validate()).
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