#1044 implement user column type #2288

Job	Run time
build_and_test (3.9, 18.x, :lint:python:client:common:smoke:stubs:)	4m 38s
build_and_test (3.9, 18.x, :server-1-of-2:)	7m 10s
build_and_test (3.9, 18.x, :server-2-of-2:)	8m 28s
build_and_test (3.9, 18.x, :nbrowser-^[A-G]:)	11m 32s
build_and_test (3.9, 18.x, :nbrowser-^[H-L]:)	5m 52s
build_and_test (3.9, 18.x, :nbrowser-^[M-O]:)	12m 7s
build_and_test (3.9, 18.x, :nbrowser-^[P-S]:)	6m 5s
build_and_test (3.9, 18.x, :nbrowser-^[^A-S]:)	4m 50s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.10)	4m 25s
build_and_test (:lint:python:client:common:smoke:, 18.x, 3.11)	4m 55s
candidate	0s
	1h 10m 2s

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