Precision issue while querying the vector on the Qdrant vector benchmark test about columnar

[glookka]

@glookka how severe was the issue? In what circumstances could it affect the search results relevancy?

It affected any search with k>limit. So it was quite severe.

[donhardman]

We tested the response on just two documents inserted into the table, and it worked fine. The expected document ID 786559 was coming before 81360, as expected.

MRE-2-doc.txt

We also tried executing the request with max_matches=1000000, which produced the correct response. However, without setting max_matches to the maximum number of documents in the table, we were still unable to see the required document in the first position.

The table showed 29 chunks, so we ran an optimize operation to reduce it to a single chunk. After that, we got results even worse than before when not changing the max_matches parameter.

It seems like there's something wrong with the max_matches parameter, and it's affecting the precision of the results. 🤔

The two screenshots show two different queries. The first one has max_matches disabled and is working with a single disk chunk, while the second query has max_matches enabled. Both queries are using k=1000000, which is the maximum database size.

[glookka]

I had some buddy-related issues reproducing that behavior locally. If you have a pre-built index (preferably with one chunk), please post a link.

[sanikolaev]

If you have a pre-built index

@glookka pls find it here /home/snikolaev/issue_56/bench_table.tgz on dev2. I didn't run merging just in case it may be import to have multiple chunkg for further investigations.

[sanikolaev]

The fixed dump is here /home/snikolaev/issue_56/bench_dump.tgz on dev2.

[glookka]

I optimized the index to a single chunk and ran queries with max_matches=1000000 and with default max_matches. I don't see a difference in query results.

select id, knn_dist() from bench where knn (vector, 1000000, (0.011699999682605267, 0.011500000022351742, 0.008700000122189522, 0.009999999776482582, 0.07850000262260437, 0.10000000149011612, 0.07840000092983246, 0.05299999937415123, 0.052400000393390656, 0.08190000057220459, 0.0658000037074089, 0.057999998331069946, 0.01590000092983246, 0.017000000923871994, 0.04610000178217888, 0.02419999986886978, 0.00839999970048666, 0.006399999838322401, 0.007199999876320362, 0.010200000368058681, 0.030400000512599945, 0.06790000200271606, 0.05889999866485596, 0.057100001722574234, 0.0333000011742115, 0.07859999686479568, 0.08919999748468399, 0.04230000078678131, 0.013799999840557575, 0.013299999758601189, 0.028999999165534973, 0.021900000050663948, 0.008999999612569809, 0.012199999764561653, 0.010700000450015068, 0.01080000028014183, 0.026599999517202377, 0.03849999979138374, 0.057100001722574234, 0.052000001072883606, 0.03550000116229057, 0.04879999905824661, 0.06920000165700912, 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0.007899999618530273, 0.010099999606609344, 0.03220000118017197, 0.030899999663233757, 0.07159999758005142, 0.052299998700618744, 0.0340999998152256, 0.06459999829530716, 0.1177000030875206, 0.061400000005960464, 0.011699999682605267, 0.013199999928474426, 0.01899999938905239, 0.0203000009059906, 0.009800000116229057, 0.006599999964237213, 0.0066999997943639755, 0.007600000128149986, 0.04129999876022339, 0.08470000326633453, 0.09740000218153, 0.07699999958276749, 0.02969999983906746, 0.07050000131130219, 0.11559999734163284, 0.08709999918937683, 0.01209999993443489, 0.012299999594688416, 0.04129999876022339, 0.02329999953508377, 0.006099999882280827, 0.012199999764561653, 0.02280000038444996, 0.010999999940395355, 0.12189999967813492, 0.17100000381469727, 0.16410000622272491, 0.14069999754428864, 0.07479999959468842, 0.15860000252723694, 0.15629999339580536, 0.15080000460147858, 0.017100000753998756, 0.034299999475479126, 0.10440000146627426, 0.05310000106692314, 0.005200000014156103, 0.006200000178068876, 0.01209999993443489, 0.011500000022351742, 0.03929999843239784, 0.0697999969124794, 0.10480000078678131, 0.16290000081062317, 0.04520000144839287, 0.09139999747276306, 0.1193000003695488, 0.11640000343322754, 0.007199999876320362, 0.03400000184774399, 0.07320000231266022, 0.030899999663233757, 0.005400000140070915, 0.008500000461935997, 0.01979999989271164, 0.013899999670684338, 0.030700000002980232, 0.02160000056028366, 0.10180000215768814, 0.07959999889135361, 0.03449999913573265, 0.04540000110864639, 0.0957999974489212, 0.0869000032544136, 0.009600000455975533, 0.01889999955892563, 0.026399999856948853, 0.03610000014305115, 0.014700000174343586, 0.011699999682605267, 0.00839999970048666, 0.03440000116825104, 0.032499998807907104, 0.03269999846816063, 0.054999999701976776, 0.06849999725818634, 0.04899999871850014, 0.03020000085234642, 0.04089999943971634, 0.13590000569820404, 0.01590000092983246, 0.016200000420212746, 0.012799999676644802, 0.05389999970793724, 0.015399999916553497, 0.013000000268220901, 0.015200000256299973, 0.06840000301599503, 0.03099999949336052, 0.02889999933540821, 0.049300000071525574, 0.1177000030875206, 0.046799998730421066, 0.0560000017285347, 0.0674000009894371, 0.20250000059604645, 0.026900000870227814, 0.015799999237060547, 0.018400000408291817, 0.06769999861717224, 0.013299999758601189, 0.009700000286102295, 0.009600000455975533, 0.03319999948143959, 0.023499999195337296, 0.024700000882148743, 0.06599999964237213, 0.04699999839067459, 0.022299999371170998, 0.06840000301599503, 0.08169999718666077, 0.12200000137090683, 0.010700000450015068, 0.0142000000923872, 0.01860000006854534, 0.041999999433755875, 0.009200000204145908, 0.006599999964237213, 0.01549999974668026, 0.01730000041425228, 0.02410000003874302, 0.02810000069439411, 0.10459999740123749, 0.07100000232458115, 0.020400000736117363, 0.09690000116825104, 0.15240000188350677, 0.09470000118017197, 0.009499999694526196, 0.013299999758601189, 0.039400000125169754, 0.03909999877214432, 0.007000000216066837, 0.012900000438094139, 0.01360000018030405, 0.00989999994635582, 0.05000000074505806, 0.10570000112056732, 0.09459999948740005, 0.08479999750852585, 0.0430000014603138, 0.1177000030875206, 0.09070000052452087, 0.08169999718666077, 0.008799999952316284, 0.018200000748038292, 0.06419999897480011, 0.04859999939799309, 0.011699999682605267, 0.022700000554323196, 0.05469999834895134, 0.03720000013709068, 0.06459999829530716, 0.093299999833107, 0.15809999406337738, 0.15289999544620514, 0.0494999997317791, 0.05950000137090683, 0.12929999828338623, 0.11240000277757645, 0.011300000362098217, 0.03680000081658363, 0.13169999420642853, 0.07530000060796738, 0.026799999177455902, 0.013000000268220901, 0.021800000220537186, 0.03460000082850456, 0.027499999850988388, 0.04529999941587448, 0.06939999759197235, 0.12280000001192093, 0.05299999937415123, 0.08389999717473984, 0.11110000312328339, 0.06790000200271606, 0.021400000900030136, 0.05640000104904175, 0.07660000026226044, 0.023800000548362732, 0.03959999978542328, 0.01640000008046627, 0.02319999970495701, 0.055799998342990875, 0.03889999911189079, 0.0357000008225441, 0.08150000125169754, 0.10930000245571136, 0.04780000075697899, 0.06700000166893005, 0.10379999876022339, 0.14419999718666077, 0.03739999979734421, 0.021299999207258224, 0.019700000062584877, 0.060100000351667404, 0.0142000000923872, 0.01730000041425228, 0.03280000016093254, 0.02070000022649765, 0.029999999329447746, 0.05119999870657921, 0.11420000344514847, 0.05050000175833702, 0.03370000049471855, 0.07190000265836716, 0.1242000013589859, 0.10620000213384628, 0.023399999365210533, 0.012400000356137753, 0.06030000001192093, 0.08659999817609787)) option max_matches=1000000;
+--------+------------+
| id     | knn_dist() |
+--------+------------+
| 568969 | 1.13936853 |
| 568975 | 1.62225807 |
| 568976 | 2.13362741 |
| 568970 | 2.76673746 |
| 568984 | 2.87248778 |
| 568978 | 3.29825449 |
| 568972 | 3.30782843 |
| 568985 | 3.39168644 |
| 568971 | 3.67472219 |
| 568983 | 3.88973951 |
| 568980 | 4.22463274 |
| 568981 | 4.55146933 |
| 568974 |   4.772573 |
| 568986 |   5.721325 |
| 568973 |   6.276696 |
| 568987 | 6.43626547 |
| 568968 |   7.522899 |
| 568982 | 7.60857964 |
| 568979 |   7.693015 |
| 568977 |   8.359688 |
+--------+------------+
20 rows in set (4.16 sec)

select id, knn_dist() from bench where knn (vector, 1000000, (0.011699999682605267, 0.011500000022351742, 0.008700000122189522, 0.009999999776482582, 0.07850000262260437, 0.10000000149011612, 0.07840000092983246, 0.05299999937415123, 0.052400000393390656, 0.08190000057220459, 0.0658000037074089, 0.057999998331069946, 0.01590000092983246, 0.017000000923871994, 0.04610000178217888, 0.02419999986886978, 0.00839999970048666, 0.006399999838322401, 0.007199999876320362, 0.010200000368058681, 0.030400000512599945, 0.06790000200271606, 0.05889999866485596, 0.057100001722574234, 0.0333000011742115, 0.07859999686479568, 0.08919999748468399, 0.04230000078678131, 0.013799999840557575, 0.013299999758601189, 0.028999999165534973, 0.021900000050663948, 0.008999999612569809, 0.012199999764561653, 0.010700000450015068, 0.01080000028014183, 0.026599999517202377, 0.03849999979138374, 0.057100001722574234, 0.052000001072883606, 0.03550000116229057, 0.04879999905824661, 0.06920000165700912, 0.05310000106692314, 0.014399999752640724, 0.014299999922513962, 0.01489999983459711, 0.02500000037252903, 0.017100000753998756, 0.016100000590085983, 0.010599999688565731, 0.03240000084042549, 0.02710000053048134, 0.04580000042915344, 0.05310000106692314, 0.06239999830722809, 0.031599998474121094, 0.06080000102519989, 0.06610000133514404, 0.08129999786615372, 0.01860000006854534, 0.022700000554323196, 0.011599999852478504, 0.03370000049471855, 0.024700000882148743, 0.011800000444054604, 0.010700000450015068, 0.06390000134706497, 0.039500001817941666, 0.040300000458955765, 0.05249999836087227, 0.0957999974489212, 0.05510000139474869, 0.06759999692440033, 0.08579999953508377, 0.17489999532699585, 0.024399999529123306, 0.02810000069439411, 0.008700000122189522, 0.05119999870657921, 0.01489999983459711, 0.00860000029206276, 0.012400000356137753, 0.035599999129772186, 0.03280000016093254, 0.03869999945163727, 0.046300001442432404, 0.048900000751018524, 0.04919999837875366, 0.0640999972820282, 0.07050000131130219, 0.11640000343322754, 0.020600000396370888, 0.016200000420212746, 0.012500000186264515, 0.04019999876618385, 0.013500000350177288, 0.011300000362098217, 0.007400000002235174, 0.011800000444054604, 0.032999999821186066, 0.02979999966919422, 0.0364999994635582, 0.041999999433755875, 0.04410000145435333, 0.051899999380111694, 0.06589999794960022, 0.05270000174641609, 0.013899999670684338, 0.016200000420212746, 0.01510000042617321, 0.02239999920129776, 0.011800000444054604, 0.008799999952316284, 0.007799999788403511, 0.010900000110268593, 0.037300001829862595, 0.07050000131130219, 0.06279999762773514, 0.03909999877214432, 0.02419999986886978, 0.055799998342990875, 0.07209999859333038, 0.04479999840259552, 0.01679999940097332, 0.013399999588727951, 0.03310000151395798, 0.020800000056624413, 0.004100000020116568, 0.008999999612569809, 0.016499999910593033, 0.011699999682605267, 0.09619999676942825, 0.13590000569820404, 0.12150000035762787, 0.08799999952316284, 0.06390000134706497, 0.11739999800920486, 0.09700000286102295, 0.07029999792575836, 0.012600000016391277, 0.021900000050663948, 0.07460000365972519, 0.0421999990940094, 0.003700000001117587, 0.00839999970048666, 0.009999999776482582, 0.013199999928474426, 0.03200000151991844, 0.06129999831318855, 0.07509999722242355, 0.09139999747276306, 0.042899999767541885, 0.0640999972820282, 0.0746999979019165, 0.04659999907016754, 0.008700000122189522, 0.028599999845027924, 0.051500000059604645, 0.027899999171495438, 0.007300000172108412, 0.01489999983459711, 0.02250000089406967, 0.018200000748038292, 0.01810000091791153, 0.01759999990463257, 0.08619999885559082, 0.06400000303983688, 0.027499999850988388, 0.028999999165534973, 0.055799998342990875, 0.060499999672174454, 0.01140000019222498, 0.014499999582767487, 0.02070000022649765, 0.02850000001490116, 0.020800000056624413, 0.019099999219179153, 0.012000000104308128, 0.04500000178813934, 0.023399999365210533, 0.023099999874830246, 0.053300000727176666, 0.08179999887943268, 0.03970000147819519, 0.024299999698996544, 0.03889999911189079, 0.10819999873638153, 0.022099999710917473, 0.030300000682473183, 0.01600000075995922, 0.05339999869465828, 0.02710000053048134, 0.01889999955892563, 0.01640000008046627, 0.08810000121593475, 0.043699998408555984, 0.017000000923871994, 0.028200000524520874, 0.13899999856948853, 0.060100000351667404, 0.03909999877214432, 0.03709999844431877, 0.20309999585151672, 0.03620000183582306, 0.0340999998152256, 0.011900000274181366, 0.07450000196695328, 0.016699999570846558, 0.0052999998442828655, 0.010400000028312206, 0.04560000076889992, 0.022199999541044235, 0.020099999383091927, 0.015599999576807022, 0.04580000042915344, 0.04309999942779541, 0.04019999876618385, 0.04439999908208847, 0.13459999859333038, 0.020600000396370888, 0.019200000911951065, 0.014999999664723873, 0.046799998730421066, 0.010300000198185444, 0.006599999964237213, 0.012000000104308128, 0.017899999395012856, 0.01850000023841858, 0.019500000402331352, 0.04399999976158142, 0.03290000185370445, 0.02979999966919422, 0.0706000030040741, 0.09549999982118607, 0.05810000002384186, 0.009700000286102295, 0.015699999406933784, 0.03189999982714653, 0.0406000018119812, 0.007400000002235174, 0.009800000116229057, 0.010300000198185444, 0.011599999852478504, 0.040699999779462814, 0.08299999684095383, 0.06750000268220901, 0.035599999129772186, 0.03519999980926514, 0.08489999920129776, 0.07400000095367432, 0.057500001043081284, 0.00800000037997961, 0.010499999858438969, 0.050200000405311584, 0.03790000081062317, 0.00989999994635582, 0.021299999207258224, 0.0364999994635582, 0.024700000882148743, 0.04809999838471413, 0.07810000330209732, 0.094200000166893, 0.08399999886751175, 0.04170000180602074, 0.05249999836087227, 0.07289999723434448, 0.06639999896287918, 0.010099999606609344, 0.023099999874830246, 0.0868000015616417, 0.06459999829530716, 0.033799998462200165, 0.02160000056028366, 0.01899999938905239, 0.03700000047683716, 0.027400000020861626, 0.044599998742341995, 0.04349999874830246, 0.10090000182390213, 0.05249999836087227, 0.06769999861717224, 0.057500001043081284, 0.04639999940991402, 0.022700000554323196, 0.04170000180602074, 0.04749999940395355, 0.024000000208616257, 0.06080000102519989, 0.033399999141693115, 0.03680000081658363, 0.0763000026345253, 0.053300000727176666, 0.021900000050663948, 0.06080000102519989, 0.11249999701976776, 0.0674000009894371, 0.021800000220537186, 0.05270000174641609, 0.13120000064373016, 0.05889999866485596, 0.03310000151395798, 0.02160000056028366, 0.06530000269412994, 0.022099999710917473, 0.017400000244379044, 0.030700000002980232, 0.030300000682473183, 0.027300000190734863, 0.029400000348687172, 0.06279999762773514, 0.033799998462200165, 0.04010000079870224, 0.043699998408555984, 0.05900000035762787, 0.07609999924898148, 0.028599999845027924, 0.01889999955892563, 0.04179999977350235, 0.06960000097751617, 0.00800000037997961, 0.007899999618530273, 0.009499999694526196, 0.011099999770522118, 0.08179999887943268, 0.10530000180006027, 0.08699999749660492, 0.05310000106692314, 0.05180000141263008, 0.08860000222921371, 0.07509999722242355, 0.06889999657869339, 0.015799999237060547, 0.018200000748038292, 0.051600001752376556, 0.028599999845027924, 0.006200000178068876, 0.004800000227987766, 0.006800000090152025, 0.009700000286102295, 0.03370000049471855, 0.06939999759197235, 0.07209999859333038, 0.061799999326467514, 0.0364999994635582, 0.08240000158548355, 0.11050000041723251, 0.04879999905824661, 0.013899999670684338, 0.01269999984651804, 0.03139999881386757, 0.020899999886751175, 0.010300000198185444, 0.008500000461935997, 0.009999999776482582, 0.00860000029206276, 0.029200000688433647, 0.03709999844431877, 0.06930000334978104, 0.05209999904036522, 0.031199999153614044, 0.04650000110268593, 0.0835999995470047, 0.04859999939799309, 0.014100000262260437, 0.011900000274181366, 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+--------+------------+
| id     | knn_dist() |
+--------+------------+
| 568969 | 1.13936853 |
| 568975 | 1.62225807 |
| 568976 | 2.13362741 |
| 568970 | 2.76673746 |
| 568984 | 2.87248778 |
| 568978 | 3.29825449 |
| 568972 | 3.30782843 |
| 568985 | 3.39168644 |
| 568971 | 3.67472219 |
| 568983 | 3.88973951 |
| 568980 | 4.22463274 |
| 568981 | 4.55146933 |
| 568974 |   4.772573 |
| 568986 |   5.721325 |
| 568973 |   6.276696 |
| 568987 | 6.43626547 |
| 568968 |   7.522899 |
| 568982 | 7.60857964 |
| 568979 |   7.693015 |
| 568977 |   8.359688 |
+--------+------------+
20 rows in set (4.16 sec)

[glookka]

Also CREATE TABLE looks like this:

CREATE TABLE `bench` (                                                                                                                                                                                                                        `id` bigint,
`vector` float_vector knn_type='hnsw' knn_dims='960' hnsw_similarity='L2' hnsw_m='32' hnsw_ef_construction='128'
);

It uses L2 distance functions, so cosine similarity calculator doesn't seem relevant.

[glookka]

I identified and fixed the issue in 694cbe5

[sanikolaev]

@glookka how severe was the issue? In what circumstances could it affect the search results relevancy?