Apply a reducer to each element of a collection, using the given selectors to determine the inputs.
Returns a dictionary of results, keyed with the output names.
| Usage | Returns | ImageCollection.reduceColumns(reducer, selectors, weightSelectors) | Dictionary |
| Argument | Type | Details | this: collection | FeatureCollection | The collection to aggregate over. |
reducer | Reducer | The reducer to apply. |
selectors | List | A selector for each input of the reducer. |
weightSelectors | List, default: null | A selector for each weighted input of the reducer. |