Merge pull request #480 from jhawthorn/combine_columns #1733

Job	Run time
benchmark-default (head)	13m 30s
benchmark-graph	39s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 15s
test (head)	42s
benchmark-ractor (head)	6m 41s
benchmark-ractor-only (head)	39s
benchmark-run-once	1m 36s
test (ruby)	47s
benchmark-default (ruby)	13m 48s
test (truffleruby)	1m 42s
all-tests	3s
	53m 22s

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