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enh(query): support descending traverse in derivative function.

This commit is contained in:
Haojun Liao 2022-06-13 19:31:17 +08:00
parent 49fd380a69
commit 7f0c2d5b80
1 changed files with 28 additions and 4 deletions
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32
source/libs/function/src/builtinsimpl.c
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@ -4918,14 +4918,13 @@ int32_t derivativeFunction(SqlFunctionCtx *pCtx) {
SColumnInfoData* pOutput = (SColumnInfoData*)pCtx->pOutput;
SColumnInfoData* pTsOutput = pCtx->pTsOutput;
int32_t step = 1;
int32_t i = pInput->startRowIndex;
TSKEY* tsList = (int64_t*)pInput->pPTS->pData;
if (pCtx->order == TSDB_ORDER_ASC) {
double v = 0;
double v = 0;
for (; i < pInput->numOfRows + pInput->startRowIndex && i >= 0; i += step) {
if (pCtx->order == TSDB_ORDER_ASC) {
for (; i < pInput->numOfRows + pInput->startRowIndex; i += 1) {
if (colDataIsNull_f(pInputCol->nullbitmap, i)) {
continue;
}
@ -4952,7 +4951,32 @@ int32_t derivativeFunction(SqlFunctionCtx *pCtx) {
pDerivInfo->prevTs = tsList[i];
}
} else {
for (; i < pInput->numOfRows + pInput->startRowIndex; i += 1) {
if (colDataIsNull_f(pInputCol->nullbitmap, i)) {
continue;
}
char* d = (char*)pInputCol->pData + pInputCol->info.bytes * i;
GET_TYPED_DATA(v, double, pInputCol->info.type, d);
int32_t pos = pCtx->offset + numOfElems;
if (!pDerivInfo->valueSet) { // initial value is not set yet
pDerivInfo->valueSet = true;
} else {
double r = ((pDerivInfo->prevValue - v) * pDerivInfo->tsWindow) / (pDerivInfo->prevTs - tsList[i]);
if (pDerivInfo->ignoreNegative && r < 0) {
} else {
colDataAppend(pOutput, pos, (const char*)&r, false);
if (pTsOutput != NULL) {
colDataAppendInt64(pTsOutput, pos, &pDerivInfo->prevTs);
}
numOfElems++;
}
}
pDerivInfo->prevValue = v;
pDerivInfo->prevTs = tsList[i];
}
}
return numOfElems;