indicator
Also written: indicator=True, _merge
A `merge` option that adds a `_merge` column saying whether each row came from `left_only`, `right_only` or `both`. It's the quickest way to find rows that didn't match.
Also written: indicator=True, _merge
A `merge` option that adds a `_merge` column saying whether each row came from `left_only`, `right_only` or `both`. It's the quickest way to find rows that didn't match.