fix(cubesql): Fix SELECT DISTINCT on pushdown #4679

Job	Run time
Check fmt/clippy	2m 47s
Unit (Rewrite Engine) (CUBESQL_TOP_DOWN_EXTRACTOR=true)	6m 22s
Unit (Rewrite Engine) (CUBESQL_TOP_DOWN_EXTRACTOR=false)	7m 13s
Build Linux GNU 20.x x86_64-unknown-linux-gnu with Python 3.9	9m 46s
Build windows-2019 20.x with Python fallback	21m 52s
Build Linux GNU 20.x x86_64-unknown-linux-gnu with Python 3.10	9m 46s
Build macos-13 x86_64-apple-darwin 20.x with Python fallback	17m 3s
Build Linux GNU 20.x x86_64-unknown-linux-gnu with Python 3.11	9m 54s
Build macos-13 aarch64-apple-darwin 20.x with Python fallback	18m 17s
Build Linux GNU 20.x x86_64-unknown-linux-gnu with Python 3.12	9m 58s
Build Linux GNU 20.x x86_64-unknown-linux-gnu with Python fallback	10m 36s
Build Linux GNU 22.x x86_64-unknown-linux-gnu with Python 3.9	10m 0s
Build Linux GNU 22.x aarch64-unknown-linux-gnu with Python 3.9	9m 54s
Build Linux GNU 22.x x86_64-unknown-linux-gnu with Python 3.10	9m 53s
Build Linux GNU 22.x x86_64-unknown-linux-gnu with Python 3.11	10m 2s
Build Linux GNU 22.x x86_64-unknown-linux-gnu with Python 3.12	9m 47s
Build Linux GNU 22.x aarch64-unknown-linux-gnu with Python 3.12	10m 1s
Build Linux GNU 22.x x86_64-unknown-linux-gnu with Python fallback	9m 38s
Build Linux GNU 22.x aarch64-unknown-linux-gnu with Python fallback	9m 29s
	3h 22m 18s

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