SQLite中的FTS5工程化实现(Hermes Agent中的bigram分词)

role

01

态好

02

%_docsize

assistant

鬼似

觉我

当前文档

0

TF = ( ( + 1) × f ) / ( K + f )

N

update

D(1) = 5.0 × 17 + 1.0 × 0 + 1.0 × 0 = 85

avg

架构

%_idx

4字节:cookie

影子表

17

页号



倒排索引目录

像鬼

灵光

D

里晨

content

天晨

其它列2

倒排索引实际数据映射: term->出现位置清单

3.13.x

代码

f(1) = 5.0 × 1 = 5.0

peak

bm25(2) = - [ 1.63870 × (-1.6094379) ]≈ 2.63740

doc:2

进行中的增量合并数

%config

bm25(2) = - [ 1.63870 ×(-1.0e-6)]≈-1.63869e-6

pgno=2

TF

还是

常量

3.53.4

官网是38位开始，现在是37位

segid=1

公里

term在第c列中出现的次数

这感

span class=\"equation-text\" contenteditable=\"false\" data-index=\"0\" data-equation=\

这波

segid=2

chat

30 个十六进制字符

低32位

儿状

tool

T

感觉

TF1 = (2.2 × 5.0) / (0.68734 + 5.0)≈1.93412

0100 0000 0000 0000 0000 0000 0000 0000 0000 0001

TF2 = (2.2 × 5.0) / (1.71266 + 5.0)≈1.63870

FTS5(Full-Text Search-v5）

我懂

110000

值

供到

那脑

今天晨跑了十公里，脑子灵光的跟一个鬼似的。

v4

想趁

子灵

确实

block

光得

avgdl

A

脑子

晨跑

血液

分段1-1个叶子页

液全

30 E4 B8 AA E9 AC BC

bigram

十公

有啥

Standard Library

浪费

C

FTS引擎

cjk_unicode61

视图

Q

79

得能

思路

文档长度归一化

(85 + 310) / 2 = 197.5

段号

权重调整

其它列1

跟一

源码

修改计数器

BM25

delete

叶页总数

似的

总分段数

一样

步血

路清

十六进制

好搞

搞的

跑完

2

bm25(1) = - [ 1.93412 ×(-1.0e-6)]≈-1.93412e-6

全供

到大

K1=1.2 × (1 - 0.75 + 0.75 × 85 / 197.5)=0.68734

今天

状态

c源码逻辑

K2 = 1.2 × (1 - 0.75 + 0.75 × 310 / 197.5)=1.71266

3E0000

user

insert

是理

分词器

Safeguard

一个

content列权重5.0

光的

leve1上的分段数

double idf = log( (nRow - nHit + 0.5) / (nHit + 0.5) );if( idf<=0.0 ) idf = 1e-6;

实灵

层级数

id=274877906945

deepseek-v4-pro

messages

024f0000

索引列token数

IDF = ln( (2 - 2 + 0.5) / (2 + 0.5) ) = ln(0.2) ≈ -1.6094379

哈哈

rowid=2

tips:当前示例只有一层

id=1

id=10

其他列2列权重1.0

自定义

鬼一

%_data

62

Q中的term数量

趁这

晰得

能穿

R

D(2) = 5.0 × 62 + 1.0 × 0 + 1.0 × 0 = 310

别浪

f(2) = 5.0 × 1 = 5.0

费了

​span class=\"equation-text\" contenteditable=\"false\" data-index=\"0\" data-equation=\

参数说明

第c列的权重

了这

rowid

固定值

读源

Linux:.soWindows:.dll

term=''

​span class=\"equation-text\" contenteditable=\"false\" data-index=\"0\" data-equation=\"\\mathrm{IDF}(q_i)\" data-url=\"%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%227.532ex%22%20height%3D%222.262ex%22%20role%3D%22img%22%20focusable%3D%22false%22%20viewBox%3D%220%20-750%203329%201000%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20aria-hidden%3D%22true%22%20style%3D%22vertical-align%3A%20-0.566ex%3B%22%3E%3Cdefs%3E%3Cpath%20id%3D%22MJX-419-TEX-N-49%22%20d%3D%22M328%200Q307%203%20180%203T32%200H21V46H43Q92%2046%20106%2049T126%2060Q128%2063%20128%20342Q128%20620%20126%20623Q122%20628%20118%20630T96%20635T43%20637H21V683H32Q53%20680%20180%20680T328%20683H339V637H317Q268%20637%20254%20634T234%20623Q232%20620%20232%20342Q232%2063%20234%2060Q238%2055%20242%2053T264%2048T317%2046H339V0H328Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-419-TEX-N-44%22%20d%3D%22M130%20622Q123%20629%20119%20631T103%20634T60%20637H27V683H228Q399%20682%20419%20682T461%20676Q504%20667%20546%20641T626%20573T685%20470T708%20336Q708%20210%20634%20116T442%203Q429%201%20228%200H27V46H60Q102%2047%20111%2049T130%2061V622ZM593%20338Q593%20439%20571%20501T493%20602Q439%20637%20355%20637H322H294Q238%20637%20234%20628Q231%20624%20231%20344Q231%2062%20232%2059Q233%2049%20248%2048T339%2046H350Q456%2046%20515%2095Q561%20133%20577%20191T593%20338Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-419-TEX-N-46%22%20d%3D%22M128%20619Q121%20626%20117%20628T101%20631T58%20634H25V680H582V676Q584%20670%20596%20560T610%20444V440H570V444Q563%20493%20561%20501Q555%20538%20543%20563T516%20601T477%20622T431%20631T374%20633H334H286Q252%20633%20244%20631T233%20621Q232%20619%20232%20490V363H284Q287%20363%20303%20363T327%20364T349%20367T372%20373T389%20385Q407%20403%20410%20459V480H450V200H410V221Q407%20276%20389%20296Q381%20303%20371%20307T348%20313T327%20316T303%20317T284%20317H232V189L233%2061Q240%2054%20245%2052T270%2048T333%2046H360V0H348Q324%203%20182%203Q51%203%2036%200H25V46H58Q100%2047%20109%2049T128%2061V619Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-419-TEX-N-28%22%20d%3D%22M94%20250Q94%20319%20104%20381T127%20488T164%20576T202%20643T244%20695T277%20729T302%20750H315H319Q333%20750%20333%20741Q333%20738%20316%20720T275%20667T226%20581T184%20443T167%20250T184%2058T225%20-81T274%20-167T316%20-220T333%20-241Q333%20-250%20318%20-250H315H302L274%20-226Q180%20-141%20137%20-14T94%20250Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-419-TEX-I-1D45E%22%20d%3D%22M33%20157Q33%20258%20109%20349T280%20441Q340%20441%20372%20389Q373%20390%20377%20395T388%20406T404%20418Q438%20442%20450%20442Q454%20442%20457%20439T460%20434Q460%20425%20391%20149Q320%20-135%20320%20-139Q320%20-147%20365%20-148H390Q396%20-156%20396%20-157T393%20-175Q389%20-188%20383%20-194H370Q339%20-192%20262%20-192Q234%20-192%20211%20-192T174%20-192T157%20-193Q143%20-193%20143%20-185Q143%20-182%20145%20-170Q149%20-154%20152%20-151T172%20-148Q220%20-148%20230%20-141Q238%20-136%20258%20-53T279%2032Q279%2033%20272%2029Q224%20-10%20172%20-10Q117%20-10%2075%2030T33%20157ZM352%20326Q329%20405%20277%20405Q242%20405%20210%20374T160%20293Q131%20214%20119%20129Q119%20126%20119%20118T118%20106Q118%2061%20136%2044T179%2026Q233%2026%20290%2098L298%20109L352%20326Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-419-TEX-I-1D456%22%20d%3D%22M184%20600Q184%20624%20203%20642T247%20661Q265%20661%20277%20649T290%20619Q290%20596%20270%20577T226%20557Q211%20557%20198%20567T184%20600ZM21%20287Q21%20295%2030%20318T54%20369T98%20420T158%20442Q197%20442%20223%20419T250%20357Q250%20340%20236%20301T196%20196T154%2083Q149%2061%20149%2051Q149%2026%20166%2026Q175%2026%20185%2029T208%2043T235%2078T260%20137Q263%20149%20265%20151T282%20153Q302%20153%20302%20143Q302%20135%20293%20112T268%2061T223%2011T161%20-11Q129%20-11%20102%2010T74%2074Q74%2091%2079%20106T122%20220Q160%20321%20166%20341T173%20380Q173%20404%20156%20404H154Q124%20404%2099%20371T61%20287Q60%20286%2059%20284T58%20281T56%20279T53%20278T49%20278T41%20278H27Q21%20284%2021%20287Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-419-TEX-N-29%22%20d%3D%22M60%20749L64%20750Q69%20750%2074%20750H86L114%20726Q208%20641%20251%20514T294%20250Q294%20182%20284%20119T261%2012T224%20-76T186%20-143T145%20-194T113%20-227T90%20-246Q87%20-249%2086%20-250H74Q66%20-250%2063%20-250T58%20-247T55%20-238Q56%20-237%2066%20-225Q221%20-64%20221%20250T66%20725Q56%20737%2055%20738Q55%20746%2060%20749Z%22%3E%3C%2Fpath%3E%3C%2Fdefs%3E%3Cg%20stroke%3D%22currentColor%22%20fill%3D%22currentColor%22%20stroke-width%3D%220%22%20transform%3D%22scale(1%2C-1)%22%3E%3Cg%20data-mml-node%3D%22math%22%3E%3Cg%20data-mml-node%3D%22TeXAtom%22%20data-mjx-texclass%3D%22ORD%22%3E%3Cg%20data-mml-node%3D%22mi%22%3E%3Cuse%20data-c%3D%2249%22%20xlink%3Ahref%3D%22%23MJX-419-TEX-N-49%22%3E%3C%2Fuse%3E%3Cuse%20data-c%3D%2244%22%20xlink%3Ahref%3D%22%23MJX-419-TEX-N-44%22%20transform%3D%22translate(361%2C0)%22%3E%3C%2Fuse%3E%3Cuse%20data-c%3D%2246%22%20xlink%3Ahref%3D%22%23MJX-419-TEX-N-46%22%20transform%3D%22translate(1125%2C0)%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22mo%22%20transform%3D%22translate(1778%2C0)%22%3E%3Cuse%20data-c%3D%2228%22%20xlink%3Ahref%3D%22%23MJX-419-TEX-N-28%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22msub%22%20transform%3D%22translate(2167%2C0)%22%3E%3Cg%20data-mml-node%3D%22mi%22%3E%3Cuse%20data-c%3D%221D45E%22%20xlink%3Ahref%3D%22%23MJX-419-TEX-I-1D45E%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22mi%22%20transform%3D%22translate(479%2C-150)%20scale(0.707)%22%3E%3Cuse%20data-c%3D%221D456%22%20xlink%3Ahref%3D%22%23MJX-419-TEX-I-1D456%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22mo%22%20transform%3D%22translate(2940%2C0)%22%3E%3Cuse%20data-c%3D%2229%22%20xlink%3Ahref%3D%22%23MJX-419-TEX-N-29%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fsvg%3E\" style=\

bm25(1) = - [ 1.93412 × (-1.6094379) ]≈3.11266

触发器

偏移编码

pgno=实际叶子页号 × 2 + doclist_index_flag

sqlite3

其他列1列权重1.0

查询

K = span class=\"equation-text\" contenteditable=\"false\" data-index=\"0\" data-equation=\"k_1\" data-url=\"%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%222.166ex%22%20height%3D%221.91ex%22%20role%3D%22img%22%20focusable%3D%22false%22%20viewBox%3D%220%20-694%20957.6%20844%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20aria-hidden%3D%22true%22%20style%3D%22vertical-align%3A%20-0.339ex%3B%22%3E%3Cdefs%3E%3Cpath%20id%3D%22MJX-432-TEX-I-1D458%22%20d%3D%22M121%20647Q121%20657%20125%20670T137%20683Q138%20683%20209%20688T282%20694Q294%20694%20294%20686Q294%20679%20244%20477Q194%20279%20194%20272Q213%20282%20223%20291Q247%20309%20292%20354T362%20415Q402%20442%20438%20442Q468%20442%20485%20423T503%20369Q503%20344%20496%20327T477%20302T456%20291T438%20288Q418%20288%20406%20299T394%20328Q394%20353%20410%20369T442%20390L458%20393Q446%20405%20434%20405H430Q398%20402%20367%20380T294%20316T228%20255Q230%20254%20243%20252T267%20246T293%20238T320%20224T342%20206T359%20180T365%20147Q365%20130%20360%20106T354%2066Q354%2026%20381%2026Q429%2026%20459%20145Q461%20153%20479%20153H483Q499%20153%20499%20144Q499%20139%20496%20130Q455%20-11%20378%20-11Q333%20-11%20305%2015T277%2090Q277%20108%20280%20121T283%20145Q283%20167%20269%20183T234%20206T200%20217T182%20220H180Q168%20178%20159%20139T145%2081T136%2044T129%2020T122%207T111%20-2Q98%20-11%2083%20-11Q66%20-11%2057%20-1T48%2016Q48%2026%2085%20176T158%20471L195%20616Q196%20629%20188%20632T149%20637H144Q134%20637%20131%20637T124%20640T121%20647Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-432-TEX-N-31%22%20d%3D%22M213%20578L200%20573Q186%20568%20160%20563T102%20556H83V602H102Q149%20604%20189%20617T245%20641T273%20663Q275%20666%20285%20666Q294%20666%20302%20660V361L303%2061Q310%2054%20315%2052T339%2048T401%2046H427V0H416Q395%203%20257%203Q121%203%20100%200H88V46H114Q136%2046%20152%2046T177%2047T193%2050T201%2052T207%2057T213%2061V578Z%22%3E%3C%2Fpath%3E%3C%2Fdefs%3E%3Cg%20stroke%3D%22currentColor%22%20fill%3D%22currentColor%22%20stroke-width%3D%220%22%20transform%3D%22scale(1%2C-1)%22%3E%3Cg%20data-mml-node%3D%22math%22%3E%3Cg%20data-mml-node%3D%22msub%22%3E%3Cg%20data-mml-node%3D%22mi%22%3E%3Cuse%20data-c%3D%221D458%22%20xlink%3Ahref%3D%22%23MJX-432-TEX-I-1D458%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22mn%22%20transform%3D%22translate(554%2C-150)%20scale(0.707)%22%3E%3Cuse%20data-c%3D%2231%22%20xlink%3Ahref%3D%22%23MJX-432-TEX-N-31%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fsvg%3E\" style=\

会儿

30 E4 B8

15(F)-2

decoder

varint encoder

​span class=\"equation-text\" contenteditable=\"false\" data-index=\"0\" data-equation=\"K = k_1 \\cdot \\left(1 - b + b \\cdot \\frac{|D|}{\\mathrm{avgdl}}\ight)\" 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​span class=\"equation-text\" contenteditable=\"false\" data-index=\"0\" data-equation=\"\\mathrm{n}(q_i)\" data-url=\"%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%224.767ex%22%20height%3D%222.262ex%22%20role%3D%22img%22%20focusable%3D%22false%22%20viewBox%3D%220%20-750%202107%201000%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%20aria-hidden%3D%22true%22%20style%3D%22vertical-align%3A%20-0.566ex%3B%22%3E%3Cdefs%3E%3Cpath%20id%3D%22MJX-316-TEX-N-6E%22%20d%3D%22M41%2046H55Q94%2046%20102%2060V68Q102%2077%20102%2091T102%20122T103%20161T103%20203Q103%20234%20103%20269T102%20328V351Q99%20370%2088%20376T43%20385H25V408Q25%20431%2027%20431L37%20432Q47%20433%2065%20434T102%20436Q119%20437%20138%20438T167%20441T178%20442H181V402Q181%20364%20182%20364T187%20369T199%20384T218%20402T247%20421T285%20437Q305%20442%20336%20442Q450%20438%20463%20329Q464%20322%20464%20190V104Q464%2066%20466%2059T477%2049Q498%2046%20526%2046H542V0H534L510%201Q487%202%20460%202T422%203Q319%203%20310%200H302V46H318Q379%2046%20379%2062Q380%2064%20380%20200Q379%20335%20378%20343Q372%20371%20358%20385T334%20402T308%20404Q263%20404%20229%20370Q202%20343%20195%20315T187%20232V168V108Q187%2078%20188%2068T191%2055T200%2049Q221%2046%20249%2046H265V0H257L234%201Q210%202%20183%202T145%203Q42%203%2033%200H25V46H41Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-316-TEX-N-28%22%20d%3D%22M94%20250Q94%20319%20104%20381T127%20488T164%20576T202%20643T244%20695T277%20729T302%20750H315H319Q333%20750%20333%20741Q333%20738%20316%20720T275%20667T226%20581T184%20443T167%20250T184%2058T225%20-81T274%20-167T316%20-220T333%20-241Q333%20-250%20318%20-250H315H302L274%20-226Q180%20-141%20137%20-14T94%20250Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-316-TEX-I-1D45E%22%20d%3D%22M33%20157Q33%20258%20109%20349T280%20441Q340%20441%20372%20389Q373%20390%20377%20395T388%20406T404%20418Q438%20442%20450%20442Q454%20442%20457%20439T460%20434Q460%20425%20391%20149Q320%20-135%20320%20-139Q320%20-147%20365%20-148H390Q396%20-156%20396%20-157T393%20-175Q389%20-188%20383%20-194H370Q339%20-192%20262%20-192Q234%20-192%20211%20-192T174%20-192T157%20-193Q143%20-193%20143%20-185Q143%20-182%20145%20-170Q149%20-154%20152%20-151T172%20-148Q220%20-148%20230%20-141Q238%20-136%20258%20-53T279%2032Q279%2033%20272%2029Q224%20-10%20172%20-10Q117%20-10%2075%2030T33%20157ZM352%20326Q329%20405%20277%20405Q242%20405%20210%20374T160%20293Q131%20214%20119%20129Q119%20126%20119%20118T118%20106Q118%2061%20136%2044T179%2026Q233%2026%20290%2098L298%20109L352%20326Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-316-TEX-I-1D456%22%20d%3D%22M184%20600Q184%20624%20203%20642T247%20661Q265%20661%20277%20649T290%20619Q290%20596%20270%20577T226%20557Q211%20557%20198%20567T184%20600ZM21%20287Q21%20295%2030%20318T54%20369T98%20420T158%20442Q197%20442%20223%20419T250%20357Q250%20340%20236%20301T196%20196T154%2083Q149%2061%20149%2051Q149%2026%20166%2026Q175%2026%20185%2029T208%2043T235%2078T260%20137Q263%20149%20265%20151T282%20153Q302%20153%20302%20143Q302%20135%20293%20112T268%2061T223%2011T161%20-11Q129%20-11%20102%2010T74%2074Q74%2091%2079%20106T122%20220Q160%20321%20166%20341T173%20380Q173%20404%20156%20404H154Q124%20404%2099%20371T61%20287Q60%20286%2059%20284T58%20281T56%20279T53%20278T49%20278T41%20278H27Q21%20284%2021%20287Z%22%3E%3C%2Fpath%3E%3Cpath%20id%3D%22MJX-316-TEX-N-29%22%20d%3D%22M60%20749L64%20750Q69%20750%2074%20750H86L114%20726Q208%20641%20251%20514T294%20250Q294%20182%20284%20119T261%2012T224%20-76T186%20-143T145%20-194T113%20-227T90%20-246Q87%20-249%2086%20-250H74Q66%20-250%2063%20-250T58%20-247T55%20-238Q56%20-237%2066%20-225Q221%20-64%20221%20250T66%20725Q56%20737%2055%20738Q55%20746%2060%20749Z%22%3E%3C%2Fpath%3E%3C%2Fdefs%3E%3Cg%20stroke%3D%22currentColor%22%20fill%3D%22currentColor%22%20stroke-width%3D%220%22%20transform%3D%22scale(1%2C-1)%22%3E%3Cg%20data-mml-node%3D%22math%22%3E%3Cg%20data-mml-node%3D%22TeXAtom%22%20data-mjx-texclass%3D%22ORD%22%3E%3Cg%20data-mml-node%3D%22mi%22%3E%3Cuse%20data-c%3D%226E%22%20xlink%3Ahref%3D%22%23MJX-316-TEX-N-6E%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22mo%22%20transform%3D%22translate(556%2C0)%22%3E%3Cuse%20data-c%3D%2228%22%20xlink%3Ahref%3D%22%23MJX-316-TEX-N-28%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22msub%22%20transform%3D%22translate(945%2C0)%22%3E%3Cg%20data-mml-node%3D%22mi%22%3E%3Cuse%20data-c%3D%221D45E%22%20xlink%3Ahref%3D%22%23MJX-316-TEX-I-1D45E%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22mi%22%20transform%3D%22translate(479%2C-150)%20scale(0.707)%22%3E%3Cuse%20data-c%3D%221D456%22%20xlink%3Ahref%3D%22%23MJX-316-TEX-I-1D456%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3C%2Fg%3E%3Cg%20data-mml-node%3D%22mo%22%20transform%3D%22translate(1718%2C0)%22%3E%3Cuse%20data-c%3D%2229%22%20xlink%3Ahref%3D%22%23MJX-316-TEX-N-29%22%3E%3C%2Fuse%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fg%3E%3C%2Fsvg%3E\" style=\

示例

dylib

写代

叶子节点

id=137438953473

总文档数

跑了

​span class=\"equation-text\" contenteditable=\"false\" data-index=\"0\" data-equation=\"\\mathrm{IDF}(q_i) = \\ln \\left( \\frac{N - n(q_i) + 0.5}{n(q_i) + 0.5} \ight)\" 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messages_fts_cjk

理架

tips

理论值

分段2-1个叶子页

子确

rowid=1

SQLite

doc:1

tokens

个鬼

啥想

000000000102020002010101020101

0010 0000 0000 0000 0000 0000 0000 0000 0000 0001

虚拟表

00

文档总数(表总行数)

实际值

07 30 E4 B8 80 E4 B8 AA  01 02 0F 03 04 AA E9 AC BC ...

穿墙

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大脑

非叶子节点

了十

词频

0列

哈哈，十公里晨跑，那脑子确实灵光得像鬼一样！这感觉我懂——跑完步血液全供到大脑，思路清晰得能穿墙。有啥想趁这会儿状态好搞的？写代码、读源码、还是理架构？别浪费了这波 peak 状态。

清晰

逆文档频率

的跟

文档统计

倒排索引实际数据

完步

占1个字节+删除标记为0

这会

key长度

包含term的行数

共用三个前缀

得像

key='0'+term

平均token数量

列

FTS总体结构

当前文档的总 token 数

00000000

poslist

列对应的tokens数量

和

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python

bm25 = - [ TF × IDF ]

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