Fix `split_by` support for rollups in generic SQL #1553

Job	Run time
lint_and_docs (ubuntu-22.04, 3.11, 22.x)	9m 44s
build_and_test_rust (ubuntu-22.04, x86_64, 22.x)	14m 19s
build_emscripten_wheel (ubuntu-22.04, x86_64, 3.11, 22.x)	19m 15s
build_python (ubuntu-22.04, x86_64, 3.11, 22.x)	21m 52s
build_python (ubuntu-22.04-arm, aarch64, 3.11, 22.x)	14m 7s
build_js (ubuntu-22.04, 3.11, 22.x)	25m 38s
test_emscripten_wheel (ubuntu-22.04, x86_64, 3.11, 22.x)	2m 53s
test_python (ubuntu-22.04-arm, aarch64, 3.11, 22.x)	1m 48s
test_python (ubuntu-22.04, x86_64, 3.11, 22.x)	1m 45s
build_and_test_jupyterlab (ubuntu-22.04, x86_64, 3.11, 22.x)	3m 39s
test_js (ubuntu-22.04, 3.11, 22.x)	5m 51s
benchmark_js	0s
benchmark_python	0s
test_python_sdist	-1s
publish	-1s
	2h 0m 49s

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