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projection on wide table
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OpenJDK 64-Bit Server VM 1.8.0_232-8u232-b09-0ubuntu1~18.04.1-b09 on Linux 4.15.0-1044-aws
Intel(R) Xeon(R) CPU E5-2670 v2 @ 2.50GHz
projection on wide table:                 Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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split threshold 10                                 6461           6535          84          0.2        6161.9       1.0X
split threshold 100                                3643           3725          74          0.3        3474.5       1.8X
split threshold 1024                               2217           2255          26          0.5        2113.9       2.9X
split threshold 2048                               1941           2003          60          0.5        1851.5       3.3X
split threshold 4096                               2195           2220          20          0.5        2093.4       2.9X
split threshold 8192                               2592           2652          39          0.4        2472.4       2.5X
split threshold 65536                             26324          26365          66          0.0       25104.1       0.2X