FEAT-#6284: Do not convert HDK query execution result to arrow. #270

Job	Run time
lint (black)	17s
lint (mypy)	4m 59s
lint (flake8)	24s
test api	4m 33s
test-headers	5m 17s
test-no-engine	3m 40s
lint (pydocstyle)	0s
test-internals	10m 44s
Test BaseOnPython execution, Python 3.8	26m 10s
Test HDK storage format, Python 3.8	24m 8s
test-clean-install-ubuntu	1m 29s
test-clean-install-windows	4m 14s
test-ubuntu (engine unidist mpi, python 3.8)	59m 32s
test-ubuntu (engine python, python 3.8, group_1)	36m 48s
test-ubuntu (engine ray, python 3.8, group_1)	31m 8s
test-ubuntu (engine ray, python 3.8, group_2)	12m 8s
test-ubuntu (engine ray, python 3.8, group_3)	25m 42s
test-ubuntu (engine ray, python 3.8, group_4)	36m 32s
test-ubuntu (engine dask, python 3.8, group_1)	44m 21s
test-ubuntu (engine dask, python 3.8, group_2)	24m 50s
test-ubuntu (engine dask, python 3.8, group_3)	56m 29s
test-ubuntu (engine dask, python 3.8, group_4)	50m 6s
test cloud	5m 28s
test-asv-benchmarks	0s
test experimental	11m 47s
test-windows (engine ray, python 3.8, group_1)	54m 39s
test-windows (engine ray, python 3.8, group_2)	39m 57s
test-windows (engine ray, python 3.8, group_3)	1h 32m 34s
test-windows (engine ray, python 3.8, group_4)	1h 9m 14s
test-windows (engine dask, python 3.8, group_1)	1h 4m 41s
test-windows (engine dask, python 3.8, group_2)	35m 22s
test-windows (engine dask, python 3.8, group_3)	1h 17m 38s
test-windows (engine dask, python 3.8, group_4)	1h 42m 19s
test (pyarrow, python 3.8)	4m 58s
test-spreadsheet (engine ray, python 3.8)	6m 8s
test-spreadsheet (engine dask, python 3.8)	4m 28s
upload-coverage	20s
	17h 13m 4s

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