feat(query): add irate function

source/libs/function/inc/builtinsimpl.h

@@ -101,6 +101,11 @@ bool getDerivativeFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 bool derivativeFuncSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResInfo);
 int32_t derivativeFunction(SqlFunctionCtx *pCtx);
 
+bool getIrateFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
+bool irateFuncSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResInfo);
+int32_t irateFunction(SqlFunctionCtx *pCtx);
+int32_t irateFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
+
 bool getFirstLastFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 int32_t firstFunction(SqlFunctionCtx *pCtx);
 int32_t firstFunctionMerge(SqlFunctionCtx *pCtx);

source/libs/function/src/builtins.c

@@ -978,6 +978,21 @@ static int32_t translateDerivative(SFunctionNode* pFunc, char* pErrBuf, int32_t
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t translateIrate(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
+  if (1 != LIST_LENGTH(pFunc->pParameterList)) {
+    return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
+  }
+
+  uint8_t colType = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
+
+  if (!IS_NUMERIC_TYPE(colType)) {
+    return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+  }
+
+  pFunc->node.resType = (SDataType){.bytes = tDataTypes[TSDB_DATA_TYPE_DOUBLE].bytes, .type = TSDB_DATA_TYPE_DOUBLE};
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t translateFirstLast(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
   // first(col_list) will be rewritten as first(col)
   if (1 != LIST_LENGTH(pFunc->pParameterList)) {
@@ -1796,6 +1811,16 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .processFunc  = derivativeFunction,
     .finalizeFunc = functionFinalize
   },
+  {
+    .name = "irate",
+    .type = FUNCTION_TYPE_IRATE,
+    .classification = FUNC_MGT_AGG_FUNC | FUNC_MGT_TIMELINE_FUNC,
+    .translateFunc = translateIrate,
+    .getEnvFunc   = getIrateFuncEnv,
+    .initFunc     = irateFuncSetup,
+    .processFunc  = irateFunction,
+    .finalizeFunc = irateFinalize
+  },
   {
     .name = "last_row",
     .type = FUNCTION_TYPE_LAST_ROW,

source/libs/function/src/builtinsimpl.c

@@ -59,6 +59,12 @@ typedef struct STuplePos {
   int32_t offset;
 } STuplePos;
 
+typedef struct SMinmaxResInfo {
+  bool      assign;  // assign the first value or not
+  int64_t   v;
+  STuplePos tuplePos;
+} SMinmaxResInfo;
+
 typedef struct STopBotResItem {
   SVariant  v;
   uint64_t  uid;  // it is a table uid, used to extract tag data during building of the final result for the tag data
@@ -148,6 +154,12 @@ typedef struct SElapsedInfo {
   int64_t timeUnit;
 } SElapsedInfo;
 
+typedef struct STwaInfo {
+  double      dOutput;
+  SPoint1     p;
+  STimeWindow win;
+} STwaInfo;
+
 typedef struct SHistoFuncBin {
   double  lower;
   double  upper;
@@ -234,6 +246,22 @@ typedef struct SUniqueInfo {
   char      pItems[];
 } SUniqueInfo;
 
+typedef struct SDerivInfo {
+  double  prevValue;       // previous value
+  TSKEY   prevTs;          // previous timestamp
+  bool    ignoreNegative;  // ignore the negative value
+  int64_t tsWindow;        // time window for derivative
+  bool    valueSet;        // the value has been set already
+} SDerivInfo;
+
+typedef struct SRateInfo {
+  double  firstValue;
+  TSKEY   firstKey;
+  double  lastValue;
+  TSKEY   lastKey;
+  int8_t  hasResult;  // flag to denote has value
+} SRateInfo;
+
 #define SET_VAL(_info, numOfElem, res) \
   do {                                 \
     if ((numOfElem) <= 0) {            \
@@ -927,12 +955,6 @@ EFuncDataRequired statisDataRequired(SFunctionNode* pFunc, STimeWindow* pTimeWin
   return FUNC_DATA_REQUIRED_STATIS_LOAD;
 }
 
-typedef struct SMinmaxResInfo {
-  bool      assign;  // assign the first value or not
-  int64_t   v;
-  STuplePos tuplePos;
-} SMinmaxResInfo;
-
 bool minmaxFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResultInfo) {
   if (!functionSetup(pCtx, pResultInfo)) {
     return false;  // not initialized since it has been initialized
@@ -4667,12 +4689,6 @@ int32_t uniqueFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   return pResInfo->numOfRes;
 }
 
-typedef struct STwaInfo {
-  double      dOutput;
-  SPoint1     p;
-  STimeWindow win;
-} STwaInfo;
-
 bool getTwaFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv) {
   pEnv->calcMemSize = sizeof(STwaInfo);
   return true;
@@ -5121,14 +5137,6 @@ int32_t blockDistFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   return TSDB_CODE_SUCCESS;
 }
 
-typedef struct SDerivInfo {
-  double  prevValue;       // previous value
-  TSKEY   prevTs;          // previous timestamp
-  bool    ignoreNegative;  // ignore the negative value
-  int64_t tsWindow;        // time window for derivative
-  bool    valueSet;        // the value has been set already
-} SDerivInfo;
-
 bool getDerivativeFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv) {
   pEnv->calcMemSize = sizeof(SDerivInfo);
   return true;
@@ -5223,6 +5231,118 @@ int32_t derivativeFunction(SqlFunctionCtx* pCtx) {
   return numOfElems;
 }
 
+bool getIrateFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv) {
+  pEnv->calcMemSize = sizeof(SRateInfo);
+  return true;
+}
+
+bool irateFuncSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResInfo) {
+  if (!functionSetup(pCtx, pResInfo)) {
+    return false;  // not initialized since it has been initialized
+  }
+
+  SRateInfo* pInfo = GET_ROWCELL_INTERBUF(pResInfo);
+
+  pInfo->firstKey   = INT64_MIN;
+  pInfo->lastKey    = INT64_MIN;
+  pInfo->firstValue = (double)INT64_MIN;
+  pInfo->lastValue  = (double)INT64_MIN;
+
+  pInfo->hasResult  = 0;
+  return true;
+}
+
+int32_t irateFunction(SqlFunctionCtx* pCtx) {
+  SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
+  SRateInfo*          pRateInfo = GET_ROWCELL_INTERBUF(pResInfo);
+
+  SInputColumnInfoData* pInput = &pCtx->input;
+  SColumnInfoData*      pInputCol = pInput->pData[0];
+
+  SColumnInfoData* pOutput = (SColumnInfoData*)pCtx->pOutput;
+
+  TSKEY*  tsList = (int64_t*)pInput->pPTS->pData;
+
+  int32_t numOfElems = 0;
+  int32_t type = pInputCol->info.type;
+
+  for (int32_t i = pInput->startRowIndex; i < pInput->numOfRows + pInput->startRowIndex; i += 1) {
+    if (colDataIsNull_f(pInputCol->nullbitmap, i)) {
+      continue;
+    }
+
+    numOfElems++;
+
+    char* data = colDataGetData(pInputCol, i);
+    double  v = 0;
+    GET_TYPED_DATA(v, double, type, data);
+
+    if (INT64_MIN == pRateInfo->lastKey) {
+      pRateInfo->lastValue = v;
+      pRateInfo->lastKey   = tsList[i];
+      continue;
+    }
+
+    if (tsList[i] > pRateInfo->lastKey) {
+      if ((INT64_MIN == pRateInfo->firstKey) || pRateInfo->lastKey > pRateInfo->firstKey) {
+        pRateInfo->firstValue = pRateInfo->lastValue;
+        pRateInfo->firstKey = pRateInfo->lastKey;
+      }
+
+      pRateInfo->lastValue = v;
+      pRateInfo->lastKey   = tsList[i];
+
+      continue;
+    }
+
+    if ((INT64_MIN == pRateInfo->firstKey) || tsList[i] > pRateInfo->firstKey) {
+      pRateInfo->firstValue = v;
+      pRateInfo->firstKey = tsList[i];
+      break;
+    }
+
+  }
+
+  SET_VAL(pResInfo, numOfElems, 1);
+  return TSDB_CODE_SUCCESS;
+}
+
+static double doCalcRate(const SRateInfo* pRateInfo, double tickPerSec) {
+  if ((INT64_MIN == pRateInfo->lastKey) || (INT64_MIN == pRateInfo->firstKey) ||
+      (pRateInfo->firstKey >= pRateInfo->lastKey)) {
+    return 0.0;
+  }
+
+  double diff = 0;
+  // If the previous value of the last is greater than the last value, only keep the last point instead of the delta
+  // value between two values.
+  diff = pRateInfo->lastValue;
+  if (diff >= pRateInfo->firstValue) {
+    diff -= pRateInfo->firstValue;
+  }
+
+  int64_t duration = pRateInfo->lastKey - pRateInfo->firstKey;
+  if (duration == 0) {
+    return 0;
+  }
+
+  return (duration > 0)? ((double)diff) / (duration/tickPerSec):0.0;
+}
+
+int32_t irateFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
+  int32_t          slotId = pCtx->pExpr->base.resSchema.slotId;
+  SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
+
+  SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
+  pResInfo->isNullRes = (pResInfo->numOfRes == 0) ? 1 : 0;
+
+  SRateInfo* pInfo = GET_ROWCELL_INTERBUF(pResInfo);
+  double result = doCalcRate(pInfo, 1000);
+  colDataAppend(pCol, pBlock->info.rows, (const char*)&result, pResInfo->isNullRes);
+
+  return pResInfo->numOfRes;
+}
+
 int32_t interpFunction(SqlFunctionCtx* pCtx) {
 #if 0
   int32_t fillType = (int32_t) pCtx->param[2].i64;