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add apercentile "t-digest" splitting

This commit is contained in:
Ganlin Zhao 2022-06-08 11:11:48 +08:00
parent 6fff47b389
commit e5b1ba6dd1
1 changed files with 21 additions and 1 deletions
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22
source/libs/function/src/builtinsimpl.c
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@ -1986,10 +1986,14 @@ static int8_t getApercentileAlgo(char *algoStr) {
}
static void buildHistogramInfo(SAPercentileInfo* pInfo) {
pInfo->pHisto = (SHistogramInfo*) ((char*) pInfo + sizeof(SAPercentileInfo));
pInfo->pHisto = (SHistogramInfo*) ((char*)pInfo + sizeof(SAPercentileInfo));
pInfo->pHisto->elems = (SHistBin*) ((char*)pInfo->pHisto + sizeof(SHistogramInfo));
}
static void buildTDigestInfo(SAPercentileInfo* pInfo) {
pInfo->pTDigest = (TDigest*)((char*)pInfo + sizeof(SAPercentileInfo));
}
bool apercentileFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResultInfo) {
if (!functionSetup(pCtx, pResultInfo)) {
return false;
@ -2090,6 +2094,22 @@ int32_t apercentileFunctionMerge(SqlFunctionCtx* pCtx) {
pInfo->percent = pInputInfo->percent;
pInfo->algo = pInputInfo->algo;
if (pInfo->algo == APERCT_ALGO_TDIGEST) {
buildTDigestInfo(pInputInfo);
tdigestAutoFill(pInputInfo->pTDigest, COMPRESSION);
if(pInputInfo->pTDigest->num_centroids == 0 && pInputInfo->pTDigest->num_buffered_pts == 0) {
return TSDB_CODE_SUCCESS;
}
buildTDigestInfo(pInfo);
TDigest *pTDigest = pInfo->pTDigest;
if(pTDigest->num_centroids <= 0) {
memcpy(pTDigest, pInputInfo->pTDigest, (size_t)TDIGEST_SIZE(COMPRESSION));
tdigestAutoFill(pTDigest, COMPRESSION);
} else {
tdigestMerge(pTDigest, pInputInfo->pTDigest);
}
} else {
buildHistogramInfo(pInputInfo);
if (pInputInfo->pHisto->numOfElems <= 0) {