Refactor `drop columns` to fix issues #11432

Job	Run time
plugins (windows-latest)	3m 31s
plugins (windows-latest)	3m 31s
tests (windows-latest, default)	14m 44s
tests (windows-latest, default)	14m 44s
fmt-clippy (windows-latest, default)	1s
fmt-clippy (windows-latest, default)	5m 1s
plugins (macos-latest)	1m 34s
plugins (macos-latest)	1m 34s
tests (macos-latest, default)	8m 47s
tests (macos-latest, default)	8m 47s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	2m 10s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	2m 10s
fmt-clippy (windows-latest, extra)	3m 53s
fmt-clippy (windows-latest, extra)	3m 53s
plugins (ubuntu-20.04)	48s
plugins (ubuntu-20.04)	48s
tests (ubuntu-20.04, default)	3m 7s
tests (ubuntu-20.04, default)	3m 7s
std-lib-and-python-virtualenv (macos-latest, py)	6m 18s
std-lib-and-python-virtualenv (macos-latest, py)	6m 18s
fmt-clippy (macos-latest, default)	2m 42s
fmt-clippy (macos-latest, default)	2m 42s
tests (ubuntu-20.04, dataframe)	5m 13s
tests (ubuntu-20.04, dataframe)	5m 13s
std-lib-and-python-virtualenv (windows-latest, py)	4m 39s
std-lib-and-python-virtualenv (windows-latest, py)	4m 39s
fmt-clippy (macos-latest, extra)	3m 8s
fmt-clippy (macos-latest, extra)	3m 8s
tests (ubuntu-20.04, extra)	3m 3s
tests (ubuntu-20.04, extra)	3m 3s
fmt-clippy (ubuntu-20.04, default)	1m 9s
fmt-clippy (ubuntu-20.04, default)	1m 9s
fmt-clippy (ubuntu-20.04, dataframe)	2m 9s
fmt-clippy (ubuntu-20.04, dataframe)	2m 9s
fmt-clippy (ubuntu-20.04, extra)	1m 40s
fmt-clippy (ubuntu-20.04, extra)	1m 40s
	2h 22m 12s

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