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@jcmkk3 is right. As described in the documentation, by default Arquero will rewrite functions to optimize data access paths. To make this safe and predictable, arbitrary object-bound methods can not be used.
To sidestep this within a derive (and also allow access to closure variables), you can preserve a normal function by using aq.escape(func) to wrap the function. However, this will opt out of any optimization, potentially causing reduced performance. But if your data is not particularly large you probably won't notice an issue.
can not add new text column
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