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Only fetch records you use
Contributions welcome — open a PR to refine or extend this article.
Description
CodeCop rule AA0175 flags code that retrieves a record and then does not use it. Every Find, FindSet, FindFirst, FindLast, or Get has a cost: the platform reads rows from SQL, materializes them, and transports them to the AL runtime. A call whose result is never read is wasted work, and on hot tables that work is never free.
Best Practice
Retrieve a record only when you need one or more of its field values. When you only need to know whether at least one row matches a filter, use IsEmpty (see use-isempty-for-existence-checks). When you only need a subset of fields, use SetLoadFields (see use-setloadfields-for-partial-records).
See sample: only-fetch-records-you-use.good.al.
Anti Pattern
Calling FindSet or Get and then ignoring the result, or using it only as a boolean existence test, performs the full fetch and throws the data away.
See sample: only-fetch-records-you-use.bad.al.