feat(query): add state_duration function

source/libs/function/inc/builtinsimpl.h

@@ -92,6 +92,7 @@ int32_t histogramFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
 bool getStateFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 bool stateFunctionSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResultInfo);
 int32_t stateCountFunction(SqlFunctionCtx* pCtx);
+int32_t stateDurationFunction(SqlFunctionCtx* pCtx);
 
 bool getSelectivityFuncEnv(SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 

source/libs/function/src/builtins.c

@@ -263,7 +263,7 @@ static int32_t translateHistogram(SFunctionNode* pFunc, char* pErrBuf, int32_t l
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t translateState(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
+static int32_t translateStateCount(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
   if (3 != LIST_LENGTH(pFunc->pParameterList)) {
     return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
   }
@@ -283,6 +283,31 @@ static int32_t translateState(SFunctionNode* pFunc, char* pErrBuf, int32_t len)
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t translateStateDuration(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
+  int32_t paraNum = LIST_LENGTH(pFunc->pParameterList);
+  if (3 != paraNum && 4 != paraNum) {
+    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);
+  }
+
+  if (((SExprNode*)nodesListGetNode(pFunc->pParameterList, 1))->resType.type != TSDB_DATA_TYPE_BINARY ||
+      (((SExprNode*)nodesListGetNode(pFunc->pParameterList, 2))->resType.type != TSDB_DATA_TYPE_BIGINT &&
+       ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 2))->resType.type != TSDB_DATA_TYPE_DOUBLE)) {
+    return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+  }
+
+  if (paraNum == 4 && ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 3))->resType.type != TSDB_DATA_TYPE_BIGINT) {
+    return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+  }
+
+  pFunc->node.resType = (SDataType) { .bytes = tDataTypes[TSDB_DATA_TYPE_BIGINT].bytes, .type = TSDB_DATA_TYPE_BIGINT };
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t translateLastRow(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
   // todo
   return TSDB_CODE_SUCCESS;
@@ -701,12 +726,22 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .name = "state_count",
     .type = FUNCTION_TYPE_STATE_COUNT,
     .classification = FUNC_MGT_NONSTANDARD_SQL_FUNC,
-    .translateFunc = translateState,
+    .translateFunc = translateStateCount,
     .getEnvFunc   = getStateFuncEnv,
     .initFunc     = functionSetup,
     .processFunc  = stateCountFunction,
     .finalizeFunc = NULL
   },
+  {
+    .name = "state_duration",
+    .type = FUNCTION_TYPE_STATE_DURATION,
+    .classification = FUNC_MGT_NONSTANDARD_SQL_FUNC | FUNC_MGT_TIMELINE_FUNC,
+    .translateFunc = translateStateDuration,
+    .getEnvFunc   = getStateFuncEnv,
+    .initFunc     = functionSetup,
+    .processFunc  = stateDurationFunction,
+    .finalizeFunc = NULL
+  },
   {
     .name = "abs",
     .type = FUNCTION_TYPE_ABS,

source/libs/function/src/builtinsimpl.c

@@ -125,7 +125,10 @@ typedef enum {
 } EHistoBinType;
 
 typedef struct SStateInfo {
-  int64_t count;
+  union {
+    int64_t count;
+    int64_t durationStart;
+  };
 } SStateInfo;
 
 typedef enum {
@@ -2841,3 +2844,52 @@ int32_t stateCountFunction(SqlFunctionCtx* pCtx) {
 
   return numOfElems;
 }
+
+int32_t stateDurationFunction(SqlFunctionCtx* pCtx) {
+  SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
+  SStateInfo*          pInfo = GET_ROWCELL_INTERBUF(pResInfo);
+
+  SInputColumnInfoData* pInput = &pCtx->input;
+  TSKEY* tsList = (int64_t*)pInput->pPTS->pData;
+
+  SColumnInfoData* pInputCol = pInput->pData[0];
+  SColumnInfoData* pTsOutput = pCtx->pTsOutput;
+
+  int32_t numOfElems = 0;
+  SColumnInfoData* pOutput = (SColumnInfoData*)pCtx->pOutput;
+
+  //TODO: process timeUnit for different db precisions
+  int32_t timeUnit = 1000;
+  if (pCtx->numOfParams == 5) { //TODO: param number incorrect
+    timeUnit = pCtx->param[3].param.i;
+  }
+
+  int8_t op = getStateOpType(varDataVal(pCtx->param[1].param.pz));
+  if (STATE_OPER_INVALID == op) {
+    return 0;
+  }
+
+  for (int32_t i = pInput->startRowIndex; i < pInput->numOfRows + pInput->startRowIndex; i += 1) {
+    numOfElems++;
+    if (colDataIsNull_f(pInputCol->nullbitmap, i)) {
+      colDataAppendNULL(pOutput, i);
+      continue;
+    }
+
+    bool ret = checkStateOp(op, pInputCol, i, pCtx->param[2].param);
+    int64_t output = -1;
+    if (ret) {
+      if (pInfo->durationStart == 0) {
+        output = 0;
+        pInfo->durationStart = tsList[i];
+      } else {
+        output = (tsList[i] - pInfo->durationStart) / timeUnit;
+      }
+    } else {
+      pInfo->durationStart = 0;
+    }
+    colDataAppend(pOutput, i, (char *)&output, false);
+  }
+
+  return numOfElems;
+}