[ Info: sorted string unique
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.404470 seconds (159 allocations: 22.900 MiB)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.403119 seconds (159 allocations: 22.900 MiB)
[ Info: shuffled string unique
  8.952677 seconds (172 allocations: 56.901 MiB)
  8.973337 seconds (172 allocations: 56.901 MiB)
[ Info: sorted string duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.506894 seconds (161 allocations: 38.160 MiB)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.494741 seconds (161 allocations: 38.160 MiB)
[ Info: sorted string duplicates many
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  3.210424 seconds (177 allocations: 2.455 GiB, 0.14% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  3.218442 seconds (177 allocations: 2.455 GiB, 0.14% gc time)
[ Info: shuffled string duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  7.044917 seconds (181 allocations: 97.076 MiB, 0.32% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  7.106402 seconds (181 allocations: 97.076 MiB, 0.32% gc time)
[ Info: shuffled string duplicates many
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 35.486817 seconds (197 allocations: 2.501 GiB, 80.21% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 33.465506 seconds (197 allocations: 2.501 GiB, 82.04% gc time)
[ Info: sorted int unique
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.073927 seconds (159 allocations: 22.900 MiB)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.073743 seconds (159 allocations: 22.900 MiB)
[ Info: shuffled int unique
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.161250 seconds (183 allocations: 30.531 MiB)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.175935 seconds (183 allocations: 30.531 MiB)
[ Info: sorted int duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.080433 seconds (159 allocations: 22.887 MiB)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.080351 seconds (159 allocations: 22.887 MiB)
[ Info: sorted int duplicates many
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 30.304874 seconds (177 allocations: 2.453 GiB, 90.36% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 30.328002 seconds (177 allocations: 2.453 GiB, 90.28% gc time)
[ Info: shuffled int duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.321306 seconds (190 allocations: 55.421 MiB, 1.08% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  0.302525 seconds (190 allocations: 55.421 MiB, 1.08% gc time)
[ Info: shuffled int duplicates many
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 31.146174 seconds (208 allocations: 2.469 GiB, 87.74% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 30.496350 seconds (208 allocations: 2.469 GiB, 89.63% gc time)
[ Info: sorted PooledArray duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  8.410814 seconds (214 allocations: 336.468 MiB, 87.90% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  8.433220 seconds (214 allocations: 385.906 MiB, 87.46% gc time)
[ Info: sorted PooledArray duplicates many
(nrow(df1), nrow(df2)) = (1000000, 2000000)
  0.653836 seconds (214 allocations: 301.883 MiB, 57.12% gc time)
(nrow(df1), nrow(df2)) = (1000000, 2000000)
  0.647200 seconds (214 allocations: 309.630 MiB, 57.81% gc time)
[ Info: shuffled PooledArray duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 10.178405 seconds (222 allocations: 348.865 MiB, 74.68% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 10.506988 seconds (222 allocations: 398.303 MiB, 75.17% gc time)
[ Info: shuffled PooledArray duplicates many
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 37.699361 seconds (224 allocations: 2.101 GiB, 89.36% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 37.268210 seconds (224 allocations: 2.109 GiB, 90.08% gc time)
[ Info: sorted CategoricalArray duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  9.058517 seconds (632.71 k allocations: 368.238 MiB, 83.59% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
  8.867881 seconds (2.00 M allocations: 469.838 MiB, 83.52% gc time)
[ Info: sorted CategoricalArray duplicates many
(nrow(df1), nrow(df2)) = (1000000, 2000000)
  0.652793 seconds (10.22 k allocations: 303.714 MiB, 52.87% gc time)
(nrow(df1), nrow(df2)) = (1000000, 2000000)
  7.730151 seconds (200.22 k allocations: 318.709 MiB, 96.05% gc time)
[ Info: shuffled CategoricalArray duplicates
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 10.619555 seconds (632.20 k allocations: 372.970 MiB, 72.62% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 10.800947 seconds (2.00 M allocations: 474.588 MiB, 72.35% gc time)
[ Info: shuffled CategoricalArray duplicates many
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 42.441216 seconds (10.23 k allocations: 2.102 GiB, 89.44% gc time)
(nrow(df1), nrow(df2)) = (1000000, 20000000)
 42.184494 seconds (200.23 k allocations: 2.117 GiB, 90.64% gc time)