xxq250
/
homework-jianmu
1
0
Fork 0
Code Issues Pull Requests 1 Actions Packages Projects Releases Wiki Activity

add fuzzy search

This commit is contained in:
yihaoDeng 2022-03-30 19:27:41 +08:00
parent 0c8271e0c2
commit a915647df8
2 changed files with 60 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
source/libs/index/inc/indexFstDfa.h
View File

@ -44,6 +44,8 @@ typedef struct FstDfaBuilder {
FstDfaBuilder *dfaBuilderCreate(SArray *insts);
void dfaBuilderDestroy(FstDfaBuilder *builder);
FstDfa *dfaBuilderBuild(FstDfaBuilder *builder);
bool dfaBuilderRunState(FstDfaBuilder *builder, FstSparseSet *cur, FstSparseSet *next, uint32_t state, uint8_t bytes,

61
source/libs/index/src/indexFstDfa.c
View File

@ -16,6 +16,8 @@
#include "indexFstDfa.h"
#include "thash.h"
const static uint32_t STATE_LIMIT = 1000;
static int dfaInstsEqual(const void *a, const void *b, size_t size) {
SArray *ar = (SArray *)a;
SArray *br = (SArray *)b;
@ -48,6 +50,18 @@ FstDfaBuilder *dfaBuilderCreate(SArray *insts) {
taosHashSetEqualFp(builder->cache, dfaInstsEqual);
return builder;
}
void dfaBuilderDestroy(FstDfaBuilder *builder) {
if (builder == NULL) {
return;
}
void *pIter = builder->cache != NULL ? taosHashIterate(builder->cache, NULL) : NULL;
while (pIter) {
SArray **key = pIter;
taosArrayDestroy(*key);
pIter = taosHashIterate(builder->cache, pIter);
}
taosHashCleanup(builder->cache);
}
FstDfa *dfaBuilderBuild(FstDfaBuilder *builder) {
uint32_t sz = taosArrayGetSize(builder->dfa->insts);
@ -55,12 +69,53 @@ FstDfa *dfaBuilderBuild(FstDfaBuilder *builder) {
FstSparseSet *nxt = sparSetCreate(sz);
dfaAdd(builder->dfa, cur, 0);
SArray * states = taosArrayInit(0, sizeof(uint32_t));
uint32_t result;
if (dfaBuilderCachedState(builder, cur, &result)) {
taosArrayPush(states, &result);
}
SHashObj *seen = taosHashInit(12, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), false, HASH_NO_LOCK);
while (taosArrayGetSize(states) != 0) {
result = *(uint32_t *)taosArrayPop(states);
for (int i = 0; i < 256; i++) {
uint32_t ns, dummpy = 0;
if (dfaBuilderRunState(builder, cur, nxt, result, i, &ns)) {
if (taosHashGet(seen, &ns, sizeof(ns)) == NULL) {
taosHashPut(seen, &ns, sizeof(ns), &dummpy, sizeof(dummpy));
taosArrayPush(states, &ns);
}
}
if (taosArrayGetSize(builder->dfa->states) > STATE_LIMIT) {
// Too many state;
//
}
}
}
taosArrayDestroy(states);
taosHashCleanup(seen);
return builder->dfa;
}
bool dfaBuilderRunState(FstDfaBuilder *builder, FstSparseSet *cur, FstSparseSet *next, uint32_t state, uint8_t bytes,
bool dfaBuilderRunState(FstDfaBuilder *builder, FstSparseSet *cur, FstSparseSet *next, uint32_t state, uint8_t byte,
uint32_t *result) {
// impl run state
return true;
sparSetClear(cur);
State *t = taosArrayGet(builder->dfa->states, state);
for (int i = 0; i < taosArrayGetSize(t->insts); i++) {
uint32_t ip = *(int32_t *)taosArrayGet(t->insts, i);
sparSetAdd(cur, ip);
}
dfaRun(builder->dfa, cur, next, byte);
t = taosArrayGet(builder->dfa->states, state);
uint32_t nxtState;
if (dfaBuilderCachedState(builder, next, &nxtState)) {
t->next[byte] = nxtState;
*result = nxtState;
return true;
}
return false;
}
bool dfaBuilderCachedState(FstDfaBuilder *builder, FstSparseSet *set, uint32_t *result) {