Github user ottobackwards commented on the issue:
https://github.com/apache/incubator-metron/pull/296
I'm working on making LENGTH work like IS_EMPTY. I can't get either one to
work as both are failing validation. There is no StellarTest for IS_EMPTY ( I
have added one to check if it is just my code that is failing ). Can you one
and try it there an make sure it works all the way through the Stellar parse
and variable resolve?
ParseException: Unable to parse IS_EMPTY(foo): Unable to execute: IS_EMPTY
expects a collection or a string
This is when calling with
`String query = "IS_EMPTY(foo);
Asser.assertEquals(true,run(query,ImmutableMap.of("foo",""));
`
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