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https://issues.apache.org/jira/browse/LUCENE-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand updated LUCENE-7716:
---------------------------------
Attachment: LUCENE-7716.patch
Here is a patch. Luceneutil reports no particular speedup or slowdown for the
sorting tasks, which might mean this change makes the paging collector a bit
faster in the case there is a single comparator, since we disabled the
single-comparator optimization when paginating.
{noformat}
TaskQPS baseline StdDev QPS patch StdDev
Pct diff
Fuzzy2 140.55 (9.2%) 138.08 (10.2%)
-1.8% ( -19% - 19%)
Respell 261.06 (3.2%) 259.42 (3.1%)
-0.6% ( -6% - 5%)
AndHighMed 247.32 (1.9%) 246.06 (2.5%)
-0.5% ( -4% - 3%)
HighSpanNear 41.90 (2.5%) 41.69 (3.0%)
-0.5% ( -5% - 5%)
Fuzzy1 120.80 (6.1%) 120.29 (5.2%)
-0.4% ( -11% - 11%)
LowSpanNear 190.79 (1.4%) 190.26 (1.4%)
-0.3% ( -3% - 2%)
IntNRQ 19.82 (7.5%) 19.77 (7.2%)
-0.3% ( -13% - 15%)
HighTermDayOfYearSort 78.30 (4.7%) 78.16 (4.9%)
-0.2% ( -9% - 9%)
Wildcard 159.10 (3.4%) 158.92 (3.0%)
-0.1% ( -6% - 6%)
OrHighLow 105.11 (3.5%) 105.02 (3.6%)
-0.1% ( -6% - 7%)
LowTerm 765.60 (3.4%) 765.00 (3.6%)
-0.1% ( -6% - 7%)
MedTerm 299.61 (2.0%) 299.39 (2.3%)
-0.1% ( -4% - 4%)
MedSloppyPhrase 84.50 (3.8%) 84.48 (3.5%)
-0.0% ( -7% - 7%)
HighSloppyPhrase 21.42 (5.9%) 21.42 (5.7%)
-0.0% ( -10% - 12%)
Prefix3 87.53 (4.4%) 87.56 (4.5%)
0.0% ( -8% - 9%)
MedSpanNear 54.81 (2.4%) 54.83 (2.8%)
0.0% ( -5% - 5%)
OrNotHighMed 87.63 (4.6%) 87.68 (4.9%)
0.1% ( -9% - 10%)
LowPhrase 78.09 (2.8%) 78.16 (2.7%)
0.1% ( -5% - 5%)
HighPhrase 4.38 (5.9%) 4.38 (5.7%)
0.1% ( -10% - 12%)
HighTermMonthSort 106.41 (9.3%) 106.56 (9.2%)
0.1% ( -16% - 20%)
LowSloppyPhrase 40.52 (2.5%) 40.58 (2.3%)
0.2% ( -4% - 5%)
OrHighNotMed 38.10 (9.7%) 38.16 (9.9%)
0.2% ( -17% - 21%)
HighTerm 105.43 (2.3%) 105.60 (2.7%)
0.2% ( -4% - 5%)
OrNotHighHigh 52.52 (5.2%) 52.60 (5.2%)
0.2% ( -9% - 11%)
OrHighMed 70.73 (5.5%) 70.88 (4.6%)
0.2% ( -9% - 10%)
AndHighHigh 85.67 (1.3%) 85.85 (1.3%)
0.2% ( -2% - 2%)
AndHighLow 1115.24 (3.3%) 1118.45 (3.1%)
0.3% ( -5% - 6%)
OrHighNotHigh 58.80 (5.5%) 58.97 (5.6%)
0.3% ( -10% - 12%)
OrNotHighLow 857.35 (4.3%) 860.72 (3.6%)
0.4% ( -7% - 8%)
OrHighNotLow 132.11 (9.6%) 132.70 (10.3%)
0.5% ( -17% - 22%)
OrHighHigh 20.51 (6.2%) 20.62 (5.6%)
0.5% ( -10% - 13%)
MedPhrase 80.54 (3.0%) 81.00 (2.4%)
0.6% ( -4% - 6%)
{noformat}
> Reduce specialization in TopFieldCollector
> ------------------------------------------
>
> Key: LUCENE-7716
> URL: https://issues.apache.org/jira/browse/LUCENE-7716
> Project: Lucene - Core
> Issue Type: Wish
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: LUCENE-7716.patch
>
>
> TopFieldCollector optimizes the single-comparator case. I think we could
> replace this specialization with a MultiLeafFieldComparator wrapper,
> similarly to how MultiCollector works. This would have the benefit of
> replacing code duplication of non-trivial logic with a simple wrapper that
> delegates calls to its sub comparators.
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