fix:[TS-5839] Fix crash when use last function on a column with all null value with partition subclause.

include/common/tcommon.h

@@ -110,6 +110,8 @@ typedef struct SFirstLastRes {
   int32_t   pkBytes;
   int8_t    pkType;
   STuplePos pos;
+  STuplePos nullTuplePos;
+  bool      nullTupleSaved;
   char      buf[];
 } SFirstLastRes;
 

source/libs/function/inc/builtinsimpl.h

@@ -152,6 +152,7 @@ int32_t getIrateInfoSize(int32_t pkBytes);
 int32_t cachedLastRowFunction(SqlFunctionCtx* pCtx);
 
 bool              getFirstLastFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);
+int32_t           firstLastFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResultInfo);
 int32_t           firstFunction(SqlFunctionCtx* pCtx);
 int32_t           firstFunctionMerge(SqlFunctionCtx* pCtx);
 int32_t           lastFunction(SqlFunctionCtx* pCtx);

source/libs/function/src/builtins.c

@@ -3469,7 +3469,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .translateFunc = translateFirstLast,
     .dynDataRequiredFunc = lastDynDataReq,
     .getEnvFunc   = getFirstLastFuncEnv,
-    .initFunc     = functionSetup,
+    .initFunc     = firstLastFunctionSetup,
     .processFunc  = lastFunction,
     .sprocessFunc = firstLastScalarFunction,
     .finalizeFunc = firstLastFinalize,

source/libs/function/src/builtinsimpl.c

@@ -2617,6 +2617,22 @@ static FORCE_INLINE TSKEY getRowPTs(SColumnInfoData* pTsColInfo, int32_t rowInde
   return *(TSKEY*)colDataGetData(pTsColInfo, rowIndex);
 }
 
+int32_t firstLastFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResInfo) {
+  if (pResInfo->initialized) {
+    return TSDB_CODE_SUCCESS;
+  }
+  if (TSDB_CODE_SUCCESS != functionSetup(pCtx, pResInfo)) {
+    return TSDB_CODE_FUNC_SETUP_ERROR;
+  }
+
+  SFirstLastRes *       pRes = GET_ROWCELL_INTERBUF(pResInfo);
+  SInputColumnInfoData* pInput = &pCtx->input;
+
+  pRes->nullTupleSaved = false;
+  pRes->nullTuplePos.pageId = -1;
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t prepareBuf(SqlFunctionCtx* pCtx) {
   if (pCtx->subsidiaries.rowLen == 0) {
     int32_t rowLen = 0;
@@ -2635,7 +2651,7 @@ static int32_t prepareBuf(SqlFunctionCtx* pCtx) {
 }
 
 static int32_t firstlastSaveTupleData(const SSDataBlock* pSrcBlock, int32_t rowIndex, SqlFunctionCtx* pCtx,
-                                      SFirstLastRes* pInfo) {
+                                      SFirstLastRes* pInfo, bool noElements) {
   int32_t code = TSDB_CODE_SUCCESS;
 
   if (pCtx->subsidiaries.num <= 0) {
@@ -2643,7 +2659,7 @@ static int32_t firstlastSaveTupleData(const SSDataBlock* pSrcBlock, int32_t rowI
   }
 
   if (!pInfo->hasResult) {
-    code = saveTupleData(pCtx, rowIndex, pSrcBlock, &pInfo->pos);
+    code = saveTupleData(pCtx, rowIndex, pSrcBlock, noElements ? &pInfo->nullTuplePos : &pInfo->pos);
   } else {
     code = updateTupleData(pCtx, rowIndex, pSrcBlock, &pInfo->pos);
   }
@@ -2669,7 +2685,7 @@ static int32_t doSaveCurrentVal(SqlFunctionCtx* pCtx, int32_t rowIndex, int64_t
   }
 
   pInfo->ts = currentTs;
-  int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, rowIndex, pCtx, pInfo);
+  int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, rowIndex, pCtx, pInfo, false);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
   }
@@ -2708,10 +2724,11 @@ int32_t firstFunction(SqlFunctionCtx* pCtx) {
   if (pInput->colDataSMAIsSet && (pInput->pColumnDataAgg[0]->numOfNull == pInput->totalRows) &&
       pInputCol->hasNull == true) {
     // save selectivity value for column consisted of all null values
-    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo);
+    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo, !pInfo->nullTupleSaved);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
+    pInfo->nullTupleSaved = true;
     return TSDB_CODE_SUCCESS;
   }
 
@@ -2802,10 +2819,11 @@ int32_t firstFunction(SqlFunctionCtx* pCtx) {
 
   if (numOfElems == 0) {
     // save selectivity value for column consisted of all null values
-    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo);
+    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo, !pInfo->nullTupleSaved);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
+    pInfo->nullTupleSaved = true;
   }
   SET_VAL(pResInfo, numOfElems, 1);
   return TSDB_CODE_SUCCESS;
@@ -2841,10 +2859,11 @@ int32_t lastFunction(SqlFunctionCtx* pCtx) {
   if (pInput->colDataSMAIsSet && (pInput->pColumnDataAgg[0]->numOfNull == pInput->totalRows) &&
       pInputCol->hasNull == true) {
     // save selectivity value for column consisted of all null values
-    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo);
+    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo, !pInfo->nullTupleSaved);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
+    pInfo->nullTupleSaved = true;
     return TSDB_CODE_SUCCESS;
   }
 
@@ -2983,10 +3002,11 @@ int32_t lastFunction(SqlFunctionCtx* pCtx) {
 
   // save selectivity value for column consisted of all null values
   if (numOfElems == 0) {
-    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo);
+    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo, !pInfo->nullTupleSaved);
     if (code != TSDB_CODE_SUCCESS) {
       return code;
     }
+    pInfo->nullTupleSaved = true;
   }
 
   return TSDB_CODE_SUCCESS;
@@ -3031,7 +3051,7 @@ static bool firstLastTransferInfoImpl(SFirstLastRes* pInput, SFirstLastRes* pOut
 static int32_t firstLastTransferInfo(SqlFunctionCtx* pCtx, SFirstLastRes* pInput, SFirstLastRes* pOutput, bool isFirst,
                                      int32_t rowIndex) {
   if (firstLastTransferInfoImpl(pInput, pOutput, isFirst)) {
-    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, rowIndex, pCtx, pOutput);
+    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, rowIndex, pCtx, pOutput, pOutput->nullTupleSaved);
     if (TSDB_CODE_SUCCESS != code) {
       return code;
     }
@@ -3079,6 +3099,14 @@ static int32_t firstLastFunctionMergeImpl(SqlFunctionCtx* pCtx, bool isFirstQuer
     }
   }
 
+  if (numOfElems == 0) {
+    int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, pInput->startRowIndex, pCtx, pInfo, !pInfo->nullTupleSaved);
+    if (code != TSDB_CODE_SUCCESS) {
+      return code;
+    }
+    pInfo->nullTupleSaved = true;
+  }
+
   SET_VAL(GET_RES_INFO(pCtx), numOfElems, 1);
   return TSDB_CODE_SUCCESS;
 }
@@ -3099,6 +3127,11 @@ int32_t firstLastFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   pResInfo->isNullRes = (pResInfo->numOfRes == 0) ? 1 : 0;
 
   SFirstLastRes* pRes = GET_ROWCELL_INTERBUF(pResInfo);
+
+  if (pResInfo->isNullRes) {
+    colDataSetNULL(pCol, pBlock->info.rows);
+    return setSelectivityValue(pCtx, pBlock, &pRes->nullTuplePos, pBlock->info.rows);
+  }
   code = colDataSetVal(pCol, pBlock->info.rows, pRes->buf, pRes->isNull || pResInfo->isNullRes);
   if (TSDB_CODE_SUCCESS != code) {
     return code;
@@ -3134,12 +3167,16 @@ int32_t firstLastPartialFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
     return TSDB_CODE_OUT_OF_RANGE;
   }
 
-  code = colDataSetVal(pCol, pBlock->info.rows, res, false);
+  if (pEntryInfo->numOfRes == 0) {
-  if (TSDB_CODE_SUCCESS != code) {
+    colDataSetNULL(pCol, pBlock->info.rows);
-    return TSDB_CODE_OUT_OF_MEMORY;
+    code = setSelectivityValue(pCtx, pBlock, &pRes->nullTuplePos, pBlock->info.rows);
+  } else {
+    code = colDataSetVal(pCol, pBlock->info.rows, res, false);
+    if (TSDB_CODE_SUCCESS != code) {
+      return TSDB_CODE_OUT_OF_MEMORY;
+    }
+    code = setSelectivityValue(pCtx, pBlock, &pRes->pos, pBlock->info.rows);
   }
-  code = setSelectivityValue(pCtx, pBlock, &pRes->pos, pBlock->info.rows);
-
   taosMemoryFree(res);
   return code;
 }
@@ -3185,7 +3222,7 @@ static int32_t doSaveLastrow(SqlFunctionCtx* pCtx, char* pData, int32_t rowIndex
     pInfo->pkData = pInfo->buf + pInfo->bytes;
   }
   pInfo->ts = cts;
-  int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, rowIndex, pCtx, pInfo);
+  int32_t code = firstlastSaveTupleData(pCtx->pSrcBlock, rowIndex, pCtx, pInfo, false);
   if (code != TSDB_CODE_SUCCESS) {
     return code;
   }

tests/script/tsim/query/cache_last.sim

@@ -89,7 +89,7 @@ if $data10 != @   -> Merge (columns=3 width=24 input_order=unknown output_order=
   return -1
 endi
 sql explain select count(*), last_row(f1), min(f1) from sta interval(1s);
-if $data10 != @   -> Merge (columns=4 width=82 input_order=asc output_order=asc mode=sort)@ then
+if $data10 != @   -> Merge (columns=4 width=106 input_order=asc output_order=asc mode=sort)@ then
   return -1
 endi
 sql explain select distinct count(*), last_row(f1), min(f1) from tba1;