pickingadd

P pickingadd is a term used in data processing and software design to describe a two-step operation that combines selection and addition. The name derives from the two actions involved: picking, selecting items that meet a criterion, and add, appending those items to a target collection.

It can be implemented as a single-pass operation in streaming or batch contexts. Variants include preserving input order, removing duplicates, or applying a transformation to items during the add phase. Some implementations separate the picking and adding into distinct stages, while others fuse them for efficiency. In formal terms, a pickingadd operation maps a source collection to a destination by selecting a subset and then inserting that subset.

Applications include ETL workflows, data integration, event processing, and functional programming patterns. It is useful when a workflow requires both filtration and accumulation without creating intermediate storages. Performance considerations include memory usage, latency, and idempotence; careful handling is required when the source can produce duplicates or when the destination has constraints such as unique keys.

Example: in a log processing system, a pickingadd might select log entries with severity ERROR and append them to an error-log store. Pseudocode: for each entry in log_stream: if entry.severity == 'ERROR': error_store.add(entry).

See also: filter, map, reduce, accumulate, ETL.