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projection on wide table
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OpenJDK 64-Bit Server VM 1.8.0_222-b10 on Linux 3.10.0-862.3.2.el7.x86_64
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                                43737          44157         345          0.0       41711.3       1.0X
split threshold 100                               33514          35770        1455          0.0       31961.3       1.3X
split threshold 1024                              14959          15206         256          0.1       14265.8       2.9X
split threshold 2048                              12024          12193         171          0.1       11467.2       3.6X
split threshold 4096                              11378          11869         450          0.1       10851.1       3.8X
split threshold 8192                              10588          10797         154          0.1       10097.8       4.1X
split threshold 65536                             56801          57025         130          0.0       54169.4       0.8X