Specialize DisiPriorityQueue for the 2-clauses case.

[jpountz]

Disjunctions with 2 clauses are rather common. Specializing this case enables some shortcuts.

[jpountz]

Here are results on wikibigall. Several queries have a speedup with a very low p-value.

                            TaskQPS baseline      StdDevQPS my_modified_version      StdDev                Pct diff p-value
                      OrHighRare      283.53      (4.2%)      277.97      (6.2%)   -2.0% ( -11% -    8%) 0.241
                        Wildcard       79.54      (3.8%)       78.68      (3.6%)   -1.1% (  -8% -    6%) 0.358
                      DismaxTerm      615.37      (2.9%)      608.82      (2.8%)   -1.1% (  -6% -    4%) 0.238
                   TermMonthSort     3963.49      (1.3%)     3926.24      (1.7%)   -0.9% (  -3% -    2%) 0.046
                DismaxOrHighHigh      122.08      (2.0%)      121.26      (3.1%)   -0.7% (  -5% -    4%) 0.418
                        PKLookup      283.63      (1.6%)      281.85      (2.5%)   -0.6% (  -4% -    3%) 0.351
                 FilteredPrefix3      132.74      (6.3%)      132.18      (6.6%)   -0.4% ( -12% -   13%) 0.836
                         Prefix3      138.60      (6.5%)      138.02      (6.9%)   -0.4% ( -12% -   13%) 0.843
             CountFilteredOrMany        8.60      (3.3%)        8.57      (2.7%)   -0.4% (  -6% -    5%) 0.668
                      TermDTSort      294.87      (4.6%)      294.24      (9.6%)   -0.2% ( -13% -   14%) 0.928
                      OrHighHigh       56.01      (4.8%)       55.94      (4.4%)   -0.1% (  -8% -    9%) 0.931
                          Fuzzy1       83.18      (2.5%)       83.10      (2.3%)   -0.1% (  -4% -    4%) 0.902
                            Term      494.29      (3.0%)      493.95      (3.7%)   -0.1% (  -6% -    6%) 0.947
                          Fuzzy2       78.47      (2.2%)       78.42      (2.0%)   -0.1% (  -4% -    4%) 0.923
                 DismaxOrHighMed      174.72      (1.9%)      174.71      (2.1%)   -0.0% (  -3% -    4%) 0.991
                       OrHighMed      202.12      (3.8%)      202.13      (3.5%)    0.0% (  -7% -    7%) 0.997
                     AndHighHigh       45.24      (1.7%)       45.24      (1.1%)    0.0% (  -2% -    2%) 0.988
                    FilteredTerm      156.36      (1.4%)      156.43      (1.4%)    0.0% (  -2% -    2%) 0.923
                   TermTitleSort      157.39      (2.3%)      157.47      (2.6%)    0.0% (  -4% -    5%) 0.954
      FilteredOr2Terms2StopWords      149.22      (1.2%)      149.33      (1.1%)    0.1% (  -2% -    2%) 0.825
             FilteredOrStopWords       43.36      (1.6%)       43.41      (1.7%)    0.1% (  -3% -    3%) 0.824
                     CountPhrase        4.26      (2.1%)        4.26      (1.5%)    0.2% (  -3% -    3%) 0.748
               TermDayOfYearSort      650.96      (2.2%)      652.28      (3.7%)    0.2% (  -5% -    6%) 0.832
              Or2Terms2StopWords      168.70      (3.5%)      169.20      (2.3%)    0.3% (  -5% -    6%) 0.750
                  FilteredPhrase       29.99      (1.5%)       30.11      (1.4%)    0.4% (  -2% -    3%) 0.394
             CountFilteredPhrase       25.30      (1.4%)       25.42      (1.5%)    0.5% (  -2% -    3%) 0.305
                FilteredOr3Terms      166.34      (1.4%)      167.18      (0.9%)    0.5% (  -1% -    2%) 0.165
               FilteredAnd3Terms      195.32      (1.7%)      196.32      (1.7%)    0.5% (  -2% -    4%) 0.345
                      AndHighMed      129.96      (1.8%)      130.71      (1.4%)    0.6% (  -2% -    3%) 0.258
     FilteredAnd2Terms2StopWords      197.65      (1.3%)      198.84      (1.4%)    0.6% (  -2% -    3%) 0.156
                AndMedOrHighHigh       60.53      (1.9%)       60.91      (1.6%)    0.6% (  -2% -    4%) 0.274
             And2Terms2StopWords      165.55      (2.3%)      166.57      (1.2%)    0.6% (  -2% -    4%) 0.287
                     CountOrMany        7.29      (8.8%)        7.34      (8.9%)    0.6% ( -15% -   20%) 0.817
               FilteredOrHighMed      154.91      (1.2%)      155.96      (0.7%)    0.7% (  -1% -    2%) 0.028
                       CountTerm    11039.26      (2.2%)    11114.73      (3.1%)    0.7% (  -4% -    6%) 0.418
         CountFilteredOrHighHigh       63.08      (2.2%)       63.53      (2.2%)    0.7% (  -3% -    5%) 0.295
              FilteredOrHighHigh       64.41      (1.5%)       64.91      (1.5%)    0.8% (  -2% -    3%) 0.098
                        Or3Terms      176.90      (3.7%)      178.38      (2.4%)    0.8% (  -5% -    7%) 0.399
                     OrStopWords       35.83      (5.8%)       36.16      (3.9%)    0.9% (  -8% -   11%) 0.547
              FilteredAndHighMed      129.99      (2.1%)      131.39      (1.6%)    1.1% (  -2% -    4%) 0.072
                          OrMany       19.85      (2.9%)       20.07      (2.2%)    1.1% (  -3% -    6%) 0.159
                    AndStopWords       32.29      (3.5%)       32.65      (1.4%)    1.1% (  -3% -    6%) 0.179
                CountAndHighHigh       54.45      (2.1%)       55.08      (2.2%)    1.2% (  -3% -    5%) 0.083
                       And3Terms      177.22      (2.8%)      179.33      (1.5%)    1.2% (  -3% -    5%) 0.095
            FilteredAndStopWords       47.32      (2.0%)       47.89      (2.4%)    1.2% (  -3% -    5%) 0.081
             FilteredAndHighHigh       62.16      (1.8%)       62.95      (2.0%)    1.3% (  -2% -    5%) 0.034
                 CountOrHighHigh       72.80      (8.9%)       73.83      (9.2%)    1.4% ( -15% -   21%) 0.621
                 CountAndHighMed      157.11      (2.6%)      159.49      (3.0%)    1.5% (  -4% -    7%) 0.092
                  CountOrHighMed      134.72      (6.7%)      136.79      (6.9%)    1.5% ( -11% -   16%) 0.476
                          Phrase       14.89      (4.5%)       15.14      (5.7%)    1.7% (  -8% -   12%) 0.303
                  FilteredOrMany       16.85      (3.5%)       17.17      (4.4%)    1.9% (  -5% -   10%) 0.132
              CombinedAndHighMed       55.18      (2.0%)       56.75      (2.4%)    2.8% (  -1% -    7%) 0.000
             CombinedAndHighHigh       15.23      (2.2%)       15.67      (2.5%)    2.9% (  -1% -    7%) 0.000
          CountFilteredOrHighMed       68.46      (1.9%)       70.53      (1.8%)    3.0% (   0% -    6%) 0.000
                    CombinedTerm       31.53      (2.6%)       32.52      (3.4%)    3.2% (  -2% -    9%) 0.001
               CombinedOrHighMed       71.83      (1.8%)       74.29      (2.0%)    3.4% (   0% -    7%) 0.000
              CombinedOrHighHigh       18.89      (1.8%)       19.55      (2.2%)    3.5% (   0% -    7%) 0.000
                  FilteredIntNRQ      112.01     (12.5%)      115.98     (16.1%)    3.5% ( -22% -   36%) 0.436
                          IntNRQ      112.95     (12.6%)      117.08     (16.2%)    3.7% ( -22% -   37%) 0.426
                 AndHighOrMedMed       45.28      (0.8%)       48.56      (1.0%)    7.3% (   5% -    9%) 0.000