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feat(query): add sample function work with selectivity

This commit is contained in:
Ganlin Zhao 2022-06-21 14:34:28 +08:00
parent 55a79f25a2
commit 3fc7fa3b3a
1 changed files with 21 additions and 20 deletions
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41
source/libs/function/src/builtinsimpl.c
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@ -195,13 +195,13 @@ typedef struct SMavgInfo {
} SMavgInfo;
typedef struct SSampleInfo {
int32_t samples;
int32_t totalPoints;
int32_t numSampled;
uint8_t colType;
int16_t colBytes;
char* data;
int64_t* timestamp;
int32_t samples;
int32_t totalPoints;
int32_t numSampled;
uint8_t colType;
int16_t colBytes;
char* data;
STuplePos* tuplePos;
} SSampleInfo;
typedef struct STailItem {
@ -4350,7 +4350,7 @@ bool getSampleFuncEnv(SFunctionNode* pFunc, SFuncExecEnv* pEnv) {
SColumnNode* pCol = (SColumnNode*)nodesListGetNode(pFunc->pParameterList, 0);
SValueNode* pVal = (SValueNode*)nodesListGetNode(pFunc->pParameterList, 1);
int32_t numOfSamples = pVal->datum.i;
pEnv->calcMemSize = sizeof(SSampleInfo) + numOfSamples * (pCol->node.resType.bytes + sizeof(int64_t));
pEnv->calcMemSize = sizeof(SSampleInfo) + numOfSamples * (pCol->node.resType.bytes + sizeof(STuplePos));
return true;
}
@ -4371,25 +4371,30 @@ bool sampleFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResultInfo)
return false;
}
pInfo->data = (char*)pInfo + sizeof(SSampleInfo);
pInfo->timestamp = (int64_t*)((char*)pInfo + sizeof(SSampleInfo) + pInfo->samples * pInfo->colBytes);
pInfo->tuplePos = (STuplePos*)((char*)pInfo + sizeof(SSampleInfo) + pInfo->samples * pInfo->colBytes);
return true;
}
static void sampleAssignResult(SSampleInfo* pInfo, char* data, TSKEY ts, int32_t index) {
static void sampleAssignResult(SSampleInfo* pInfo, char* data, int32_t index) {
assignVal(pInfo->data + index * pInfo->colBytes, data, pInfo->colBytes, pInfo->colType);
*(pInfo->timestamp + index) = ts;
}
static void doReservoirSample(SSampleInfo* pInfo, char* data, TSKEY ts, int32_t index) {
static void doReservoirSample(SqlFunctionCtx* pCtx, SSampleInfo* pInfo, char* data, int32_t index) {
pInfo->totalPoints++;
if (pInfo->numSampled < pInfo->samples) {
sampleAssignResult(pInfo, data, ts, pInfo->numSampled);
sampleAssignResult(pInfo, data, pInfo->numSampled);
if (pCtx->subsidiaries.num > 0) {
saveTupleData(pCtx, index, pCtx->pSrcBlock, pInfo->tuplePos + pInfo->numSampled * sizeof(STuplePos));
}
pInfo->numSampled++;
} else {
int32_t j = taosRand() % (pInfo->totalPoints);
if (j < pInfo->samples) {
sampleAssignResult(pInfo, data, ts, j);
sampleAssignResult(pInfo, data, j);
if (pCtx->subsidiaries.num > 0) {
copyTupleData(pCtx, index, pCtx->pSrcBlock, pInfo->tuplePos + j * sizeof(STuplePos));
}
}
}
}
@ -4400,11 +4405,6 @@ int32_t sampleFunction(SqlFunctionCtx* pCtx) {
SInputColumnInfoData* pInput = &pCtx->input;
TSKEY* tsList = NULL;
if (pInput->pPTS != NULL) {
tsList = (int64_t*)pInput->pPTS->pData;
}
SColumnInfoData* pInputCol = pInput->pData[0];
for (int32_t i = pInput->startRowIndex; i < pInput->numOfRows + pInput->startRowIndex; i += 1) {
if (colDataIsNull_s(pInputCol, i)) {
@ -4412,7 +4412,7 @@ int32_t sampleFunction(SqlFunctionCtx* pCtx) {
}
char* data = colDataGetData(pInputCol, i);
doReservoirSample(pInfo, data, /*tsList[i]*/ 0, i);
doReservoirSample(pCtx, pInfo, data, i);
}
SET_VAL(pResInfo, pInfo->numSampled, pInfo->numSampled);
@ -4431,6 +4431,7 @@ int32_t sampleFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
int32_t currentRow = pBlock->info.rows;
for (int32_t i = 0; i < pInfo->numSampled; ++i) {
colDataAppend(pCol, currentRow + i, pInfo->data + i * pInfo->colBytes, false);
setSelectivityValue(pCtx, pBlock, pInfo->tuplePos + i * sizeof(STuplePos), currentRow + i);
}
return pInfo->numSampled;