Documentation: Defining Futures as part of a Schema

[itsezc]

Description

The existing docs cover futures, but not how they can be used as part of DEFINE, i.e.
DEFINE FIELD first_name ON account TYPE string; on a schemaful table, its unclear how one can achieve the same with a future.

Additionally, the info performance penalty for using futures would be great, the dos / donts and caveats, if any and some examples i.e. how to calculate "birth day" from "date of birth".

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