perf: `Arc::ptr_eq` short-circuit to DType eq comparisons #282

Job	Run time
remove-sql-label	6s
remove-bench-label	0s
bench	-1s
sql-bench / sql / bench (statpopgen, statpopgen, Statistical and Population Genetics, duckdb:parquet,duckdb:vortex,...	12m 40s
sql-bench / sql / bench (tpch-nvme-10, tpch, TPC-H SF=10 on NVME, datafusion:arrow,datafusion:parquet,datafusion:vo...	7m 53s
sql-bench / sql / bench (tpch-s3-10, tpch, TPC-H SF=10 on S3, vortex-bench/data/tpch/10.0, s3://vortex-ci-benchmark...	24m 28s
sql-bench / sql / bench (clickbench-nvme, clickbench, Clickbench on NVME, datafusion:parquet,datafusion:vortex,duck...	14m 35s
sql-bench / sql / bench (tpcds-nvme, tpcds, TPC-DS SF=1 on NVME, datafusion:parquet,datafusion:vortex,datafusion:vo...	7m 34s
sql-bench / sql / bench (tpch-s3, tpch, TPC-H SF=1 on S3, vortex-bench/data/tpch/1.0, s3://vortex-ci-benchmark-data...	13m 37s
sql-bench / sql / bench (tpch-nvme, tpch, TPC-H SF=1 on NVME, datafusion:arrow,datafusion:parquet,datafusion:vortex...	3m 11s
sql-bench / sql / bench (fineweb, fineweb, FineWeb NVMe, datafusion:parquet,datafusion:vortex,datafusion:vortex-com...	4m 25s
sql-bench / sql / bench (polarsignals, polarsignals, PolarSignals Profiling, datafusion:vortex, 1)	2m 59s
sql-bench / sql / bench (fineweb-s3, fineweb, FineWeb S3, vortex-bench/data/fineweb, s3://vortex-ci-benchmark-datas...	14m 57s
	1h 46m 24s

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