dr_lookup_spec()

Defines an enrichment independently of a product or recipe. Use dr_set_engine() to select dm constraint checks, then attach it with dr_step_transform().

Usage

dr_lookup_spec(
  source,
  by,
  unmatched = c("error", "keep"),
  suffix = c(".x", ".y"),
  name = NULL,
  table = NULL
)

Arguments

source: Reference data, path, source adapter, product or successful result.
by: Equality keys as a character vector, named vector or dplyr::join_by().
unmatched: Whether unmatched input rows fail or retain missing attributes.
suffix: Two suffixes for overlapping non-key column names.
name: Stable reference delivery name for source replacement.
table: Member table to select from a successful model result.

Value

A deferred lookup transformation specification.

Examples

customers <- data.frame(id = 1:2, region = c("North", "South"))
lookup <- dr_lookup_spec(customers, by = "id", name = "customers") |>
  dr_set_engine("dm")
dr_recipe() |> dr_step_transform(lookup)

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