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Validate a Data Frame Against a Provenance Schema

Source: R/lib_data_loader.R
validate_schema.Rd

Checks a raw data frame against the schema block of a provenance object: required columns, row-count bounds, and allowed categorical value sets. Returns the issues found rather than raising, so the caller decides how to react.

Usage

validate_schema(df_raw, provenance)

Arguments

df_raw

The data frame to validate.

provenance

A provenance list as returned by load_provenance(). The schema block may contain expected_columns, structural_invariants (min_data_rows, max_data_rows), and expected_value_sets (a named list of allowed values per column).

Value

A named list of issues; each issue is a list with severity ("fatal" or "warning") and a human-readable message. A zero-length list means the data frame is clean.