tablecloth.api.group-by — scicloj/tablecloth 6.031

group-by clj

(group-by ds grouping-selector)

(group-by ds
          grouping-selector
          {:keys [select-keys result-type]
           :or {result-type :as-dataset select-keys :all}
           :as options})

Group dataset by:

• column name
• list of columns
• map of keys and row indexes
• function getting map of values

Options are:

• select-keys - when grouping is done by function, you can limit fields to a select-keys seq.
• result-type - return results as dataset (:as-dataset, default) or as map of datasets (:as-map) or as map of row indexes (:as-indexes) or as sequence of (sub)datasets
• other parameters which are passed to dataset fn

When dataset is returned, meta contains :grouped? set to true. Columns in dataset:

• name - group name
• group-id - id of the group (int)
• data - group as dataset

groups->map clj

(groups->map ds)

Convert grouped dataset to the map of groups

groups->seq clj

(groups->seq ds)

process->ungroup clj

(process->ungroup ds process-fn)

(process->ungroup ds
                  process-fn
                  {:keys [order? add-group-as-column add-group-id-as-column
                          separate? dataset-name parallel?]
                   :or {separate? true}})

ungroup clj

(ungroup ds)

(ungroup ds
         {:keys [order? add-group-as-column add-group-id-as-column separate?
                 dataset-name parallel?]
          :or {separate? true}})

Concat groups into dataset.

When add-group-as-column or add-group-id-as-column is set to true or name(s), columns with group name(s) or group id is added to the result.

Before joining the groups groups can be sorted by group name.