GH-4809 Performance improvements to the iterations

[hmottestad]

GitHub issue resolved: #4809

Briefly describe the changes proposed in this PR:

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• my pull request is self-contained
• I've added tests for the changes I made
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[hmottestad]

Before

Benchmark                                                     Mode  Cnt     Score    Error  Units
QueryBenchmark.complexQuery                                   avgt    5     1.492 ±  0.032  ms/op
QueryBenchmark.different_datasets_with_similar_distributions  avgt    5     0.767 ±  0.021  ms/op
QueryBenchmark.groupByQuery                                   avgt    5     0.966 ±  0.040  ms/op
QueryBenchmark.long_chain                                     avgt    5   260.424 ±  8.599  ms/op
QueryBenchmark.lots_of_optional                               avgt    5    54.358 ±  0.439  ms/op
QueryBenchmark.minus                                          avgt    5  2350.765 ± 16.433  ms/op
QueryBenchmark.nested_optionals                               avgt    5    74.068 ±  0.110  ms/op
QueryBenchmark.pathExpressionQuery1                           avgt    5     8.003 ±  0.123  ms/op
QueryBenchmark.pathExpressionQuery2                           avgt    5     1.116 ±  0.033  ms/op
QueryBenchmark.query_distinct_predicates                      avgt    5    73.386 ±  0.367  ms/op
QueryBenchmark.simple_filter_not                              avgt    5     3.237 ±  0.061  ms/op

After

Benchmark                                                     Mode  Cnt     Score   Error  Units
QueryBenchmark.complexQuery                                   avgt    5     1.330 ± 0.006  ms/op
QueryBenchmark.different_datasets_with_similar_distributions  avgt    5     0.615 ± 0.002  ms/op
QueryBenchmark.groupByQuery                                   avgt    5     0.984 ± 0.243  ms/op
QueryBenchmark.long_chain                                     avgt    5   198.337 ± 2.056  ms/op
QueryBenchmark.lots_of_optional                               avgt    5    55.765 ± 2.690  ms/op
QueryBenchmark.minus                                          avgt    5  1084.976 ± 8.501  ms/op
QueryBenchmark.nested_optionals                               avgt    5    69.339 ± 0.199  ms/op
QueryBenchmark.pathExpressionQuery1                           avgt    5     6.978 ± 0.047  ms/op
QueryBenchmark.pathExpressionQuery2                           avgt    5     1.120 ± 0.043  ms/op
QueryBenchmark.query_distinct_predicates                      avgt    5    71.958 ± 2.759  ms/op
QueryBenchmark.simple_filter_not                              avgt    5     2.674 ± 0.011  ms/op

Benchmark                                                     Mode  Cnt     Score    Error  Units
QueryBenchmark.complexQuery                                   avgt    5     1.337 ±  0.010  ms/op
QueryBenchmark.different_datasets_with_similar_distributions  avgt    5     0.605 ±  0.003  ms/op
QueryBenchmark.groupByQuery                                   avgt    5     0.924 ±  0.194  ms/op
QueryBenchmark.long_chain                                     avgt    5   186.587 ±  4.362  ms/op
QueryBenchmark.lots_of_optional                               avgt    5    52.769 ±  1.092  ms/op
QueryBenchmark.minus                                          avgt    5  1105.970 ± 17.679  ms/op
QueryBenchmark.nested_optionals                               avgt    5    68.153 ±  4.593  ms/op
QueryBenchmark.pathExpressionQuery1                           avgt    5     7.052 ±  0.610  ms/op
QueryBenchmark.pathExpressionQuery2                           avgt    5     1.125 ±  0.009  ms/op
QueryBenchmark.query_distinct_predicates                      avgt    5    64.641 ±  3.559  ms/op
QueryBenchmark.simple_filter_not                              avgt    5     3.275 ±  0.485  ms/op

Benchmark                                                     Mode  Cnt     Score    Error  Units
QueryBenchmark.complexQuery                                   avgt   15     1.332 ±  0.039  ms/op
QueryBenchmark.different_datasets_with_similar_distributions  avgt   15     0.624 ±  0.006  ms/op
QueryBenchmark.groupByQuery                                   avgt   15     0.930 ±  0.044  ms/op
QueryBenchmark.long_chain                                     avgt   15   207.963 ±  8.816  ms/op
QueryBenchmark.lots_of_optional                               avgt   15    53.982 ±  0.829  ms/op
QueryBenchmark.minus                                          avgt   15  1093.575 ± 19.799  ms/op
QueryBenchmark.nested_optionals                               avgt   15    60.276 ±  0.972  ms/op
QueryBenchmark.pathExpressionQuery1                           avgt   15     7.688 ±  0.213  ms/op
QueryBenchmark.pathExpressionQuery2                           avgt   15     1.143 ±  0.021  ms/op
QueryBenchmark.query_distinct_predicates                      avgt   15    66.576 ±  1.820  ms/op
QueryBenchmark.simple_filter_not                              avgt   15     2.850 ±  0.065  ms/op