Get the file indices for `study_view` based on metadataType.
get_file_indices(study_view, meta_types)
study_view | The file view for a study, with the columns 'file_data', where each element is a tibble with the data, and metadataType, where each element is the metadataType for the file. |
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meta_types | List of metadataTypes. |
Vector of indices of `study_view` for which the metadataType exists; `NULL` if none exist.