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allow for multiple null_value mappings in the data dictionary #316
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This PR addresses the need for multiple field values to map to a
NULLvalue in the API. Thisis related to RTICWDT/college-scorecard#903.
Currently, config.null_value and map_column_types methods only allow for a single string value in the data dictionary to be mapped to null when encountered in the csv data during import. The default has been the string
"NULL"if no data dictionary entry was found.This PR allows for the
null_valueto be defined as an array OR a single entry when the column type's are mapped and will give more flexibility for other field value instances that should be mapped to null.