fix: add merge join operator result limitation

source/common/src/tdatablock.c

@@ -94,6 +94,9 @@ int32_t colDataAppend(SColumnInfoData* pColumnInfoData, uint32_t currentRow, con
 
       while (newSize < pAttr->length + dataLen) {
         newSize = newSize * 1.5;
+        if (newSize > UINT32_MAX) {
+          return TSDB_CODE_OUT_OF_MEMORY;
+        }
       }
 
       char* buf = taosMemoryRealloc(pColumnInfoData->pData, newSize);

source/libs/executor/src/joinoperator.c

@@ -24,6 +24,17 @@
 #include "tmsg.h"
 #include "ttypes.h"
 
+typedef struct SJoinRowCtx {
+  bool    rowRemains;
+  int64_t ts;
+  SArray* leftRowLocations;
+  SArray* rightRowLocations;
+  SArray* leftCreatedBlocks;
+  SArray* rightCreatedBlocks;
+  int32_t leftRowIdx;
+  int32_t rightRowIdx;
+} SJoinRowCtx;
+
 typedef struct SJoinOperatorInfo {
   SSDataBlock* pRes;
   int32_t      joinType;
@@ -37,6 +48,8 @@ typedef struct SJoinOperatorInfo {
   int32_t      rightPos;
   SColumnInfo  rightCol;
   SNode*       pCondAfterMerge;
+
+  SJoinRowCtx  rowCtx;
 } SJoinOperatorInfo;
 
 static void         setJoinColumnInfo(SColumnInfo* pColumn, const SColumnNode* pColumnNode);
@@ -287,37 +300,86 @@ static int32_t mergeJoinGetDownStreamRowsEqualTimeStamp(SOperatorInfo* pOperator
 
 static int32_t mergeJoinJoinDownstreamTsRanges(SOperatorInfo* pOperator, int64_t timestamp, SSDataBlock* pRes,
                                                int32_t* nRows) {
-  SJoinOperatorInfo* pJoinInfo = pOperator->info;
-  SArray*            leftRowLocations = taosArrayInit(8, sizeof(SRowLocation));
-  SArray*            leftCreatedBlocks = taosArrayInit(8, POINTER_BYTES);
-
-  SArray* rightRowLocations = taosArrayInit(8, sizeof(SRowLocation));
-  SArray* rightCreatedBlocks = taosArrayInit(8, POINTER_BYTES);
   int32_t code = TSDB_CODE_SUCCESS;
+  SJoinOperatorInfo* pJoinInfo = pOperator->info;
+  SArray* leftRowLocations = NULL;
+  SArray* leftCreatedBlocks = NULL;
+  SArray* rightRowLocations = NULL;
+  SArray* rightCreatedBlocks = NULL;
+  int32_t leftRowIdx = 0;
+  int32_t rightRowIdx = 0;
+  int32_t i, j;
+  
+  if (pJoinInfo->rowCtx.rowRemains) {
+    leftRowLocations = pJoinInfo->rowCtx.leftRowLocations;
+    leftCreatedBlocks = pJoinInfo->rowCtx.leftCreatedBlocks;
+    rightRowLocations = pJoinInfo->rowCtx.rightRowLocations;
+    rightCreatedBlocks = pJoinInfo->rowCtx.rightCreatedBlocks;
+    leftRowIdx = pJoinInfo->rowCtx.leftRowIdx;
+    rightRowIdx = pJoinInfo->rowCtx.rightRowIdx;
+  } else {
+    leftRowLocations = taosArrayInit(8, sizeof(SRowLocation));
+    leftCreatedBlocks = taosArrayInit(8, POINTER_BYTES);
+
+    rightRowLocations = taosArrayInit(8, sizeof(SRowLocation));
+    rightCreatedBlocks = taosArrayInit(8, POINTER_BYTES);
+
     mergeJoinGetDownStreamRowsEqualTimeStamp(pOperator, 0, pJoinInfo->leftCol.slotId, pJoinInfo->pLeft,
                                              pJoinInfo->leftPos, timestamp, leftRowLocations, leftCreatedBlocks);
     mergeJoinGetDownStreamRowsEqualTimeStamp(pOperator, 1, pJoinInfo->rightCol.slotId, pJoinInfo->pRight,
                                              pJoinInfo->rightPos, timestamp, rightRowLocations, rightCreatedBlocks);
+  }
   
   size_t leftNumJoin = taosArrayGetSize(leftRowLocations);
   size_t rightNumJoin = taosArrayGetSize(rightRowLocations);
-  code = blockDataEnsureCapacity(pRes, *nRows + leftNumJoin * rightNumJoin);
+  uint32_t maxRowNum = *nRows + (leftNumJoin - leftRowIdx - 1) * rightNumJoin + rightNumJoin - rightRowIdx;
+  uint32_t limitRowNum = maxRowNum;
+  if (maxRowNum > pOperator->resultInfo.threshold) {
+    limitRowNum = pOperator->resultInfo.threshold;
+    if (!pJoinInfo->rowCtx.rowRemains) {
+      pJoinInfo->rowCtx.rowRemains = true;
+      pJoinInfo->rowCtx.ts = timestamp;
+      pJoinInfo->rowCtx.leftRowLocations = leftRowLocations;
+      pJoinInfo->rowCtx.rightRowLocations = rightRowLocations;
+      pJoinInfo->rowCtx.leftCreatedBlocks = leftCreatedBlocks;
+      pJoinInfo->rowCtx.rightCreatedBlocks = rightCreatedBlocks;
+    }
+  }
+
+  code = blockDataEnsureCapacity(pRes, limitRowNum);
   if (code != TSDB_CODE_SUCCESS) {
     qError("%s can not ensure block capacity for join. left: %zu, right: %zu", GET_TASKID(pOperator->pTaskInfo),
            leftNumJoin, rightNumJoin);
   }
+
+  
   if (code == TSDB_CODE_SUCCESS) {
-    for (int32_t i = 0; i < leftNumJoin; ++i) {
+    bool done = false;
-      for (int32_t j = 0; j < rightNumJoin; ++j) {
+    for (i = leftRowIdx; i < leftNumJoin; ++i, rightRowIdx = 0) {
+      for (j = rightRowIdx; j < rightNumJoin; ++j) {
+        if (*nRows >= limitRowNum) {
+          done = true;
+          break;
+        }
+
         SRowLocation* leftRow = taosArrayGet(leftRowLocations, i);
         SRowLocation* rightRow = taosArrayGet(rightRowLocations, j);
         mergeJoinJoinLeftRight(pOperator, pRes, *nRows, leftRow->pDataBlock, leftRow->pos, rightRow->pDataBlock,
                                rightRow->pos);
         ++*nRows;
       }
+      if (done) {
+        break;
       }
     }
 
+    if (maxRowNum > pOperator->resultInfo.threshold) {
+      pJoinInfo->rowCtx.leftRowIdx = i;
+      pJoinInfo->rowCtx.rightRowIdx = j;
+    }
+  }
+
+  if (maxRowNum <= pOperator->resultInfo.threshold) {
     for (int i = 0; i < taosArrayGetSize(rightCreatedBlocks); ++i) {
       SSDataBlock* pBlock = taosArrayGetP(rightCreatedBlocks, i);
       blockDataDestroy(pBlock);
@@ -330,6 +392,15 @@ static int32_t mergeJoinJoinDownstreamTsRanges(SOperatorInfo* pOperator, int64_t
     }
     taosArrayDestroy(leftCreatedBlocks);
     taosArrayDestroy(leftRowLocations);
+
+    if (pJoinInfo->rowCtx.rowRemains) {
+      pJoinInfo->rowCtx.rowRemains = false;
+      pJoinInfo->rowCtx.leftRowLocations = NULL;
+      pJoinInfo->rowCtx.rightRowLocations = NULL;
+      pJoinInfo->rowCtx.leftCreatedBlocks = NULL;
+      pJoinInfo->rowCtx.rightCreatedBlocks = NULL;
+    }
+  }
   return TSDB_CODE_SUCCESS;
 }
 
@@ -379,22 +450,27 @@ static void doMergeJoinImpl(struct SOperatorInfo* pOperator, SSDataBlock* pRes)
   while (1) {
     int64_t leftTs = 0;
     int64_t rightTs = 0;
+    if (pJoinInfo->rowCtx.rowRemains) {
+      leftTs = pJoinInfo->rowCtx.ts;
+      rightTs = pJoinInfo->rowCtx.ts;
+    } else {
       bool    hasNextTs = mergeJoinGetNextTimestamp(pOperator, &leftTs, &rightTs);
       if (!hasNextTs) {
         break;
       }
+    }
 
     if (leftTs == rightTs) {
       mergeJoinJoinDownstreamTsRanges(pOperator, leftTs, pRes, &nrows);
     } else if ((asc && leftTs < rightTs) || (!asc && leftTs > rightTs)) {
       pJoinInfo->leftPos += 1;
 
-      if (pJoinInfo->leftPos >= pJoinInfo->pLeft->info.rows) {
+      if (pJoinInfo->leftPos >= pJoinInfo->pLeft->info.rows && pRes->info.rows < pOperator->resultInfo.threshold) {
         continue;
       }
     } else if ((asc && leftTs > rightTs) || (!asc && leftTs < rightTs)) {
       pJoinInfo->rightPos += 1;
-      if (pJoinInfo->rightPos >= pJoinInfo->pRight->info.rows) {
+      if (pJoinInfo->rightPos >= pJoinInfo->pRight->info.rows && pRes->info.rows < pOperator->resultInfo.threshold) {
         continue;
       }
     }

tests/parallel_test/cases.task

@@ -179,6 +179,7 @@
 ,,y,script,./test.sh -f tsim/query/sys_tbname.sim
 ,,y,script,./test.sh -f tsim/query/groupby.sim
 ,,y,script,./test.sh -f tsim/query/forceFill.sim
+,,y,script,./test.sh -f tsim/query/join.sim
 ,,y,script,./test.sh -f tsim/qnode/basic1.sim
 ,,y,script,./test.sh -f tsim/snode/basic1.sim
 ,,y,script,./test.sh -f tsim/mnode/basic1.sim

tests/script/tsim/query/join.sim

@@ -0,0 +1,72 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/exec.sh -n dnode1 -s start
+sql connect
+
+$dbPrefix = db
+$tbPrefix1 = tba
+$tbPrefix2 = tbb
+$mtPrefix = stb
+$tbNum = 10000
+$rowNum = 2
+
+print =============== step1
+$i = 0
+$db = $dbPrefix . $i
+$mt1 = $mtPrefix . $i
+$i = 1
+$mt2 = $mtPrefix . $i
+
+sql drop database $db -x step1
+step1:
+sql create database $db
+sql use $db
+sql create table $mt1 (ts timestamp, f1 int) TAGS(tag1 int, tag2 binary(500))
+sql create table $mt2 (ts timestamp, f1 int) TAGS(tag1 int, tag2 binary(500))
+
+print ====== start create child tables and insert data
+$i = 0
+while $i < $tbNum
+  $tb = $tbPrefix1 . $i
+  sql create table $tb using $mt1 tags( $i , 'aaaaaaaaaaaaaaaaaaaaaaaaaaa')
+
+  $x = 0
+  while $x < $rowNum
+    $cc = $x * 60000
+    $ms = 1601481600000 + $cc
+
+    sql insert into $tb values ($ms , $x )
+    $x = $x + 1
+  endw
+
+  $i = $i + 1
+endw
+
+print =============== step2
+$i = 0
+while $i < $tbNum
+  $tb = $tbPrefix2 . $i
+  sql create table $tb using $mt2 tags( $i , 'aaaaaaaaaaaaaaaaaaaaaaaaaaa')
+
+  $x = 0
+  while $x < $rowNum
+    $cc = $x * 60000
+    $ms = 1601481600000 + $cc
+
+    sql insert into $tb values ($ms , $x )
+    $x = $x + 1
+  endw
+
+  $i = $i + 1
+endw
+
+sql select * from tba0 t1, tbb0 t2 where t1.ts=t2.ts;
+if $rows != 2 then
+  return -1
+endi
+sql select * from stb0 t1, stb1 t2 where t1.ts=t2.ts and t1.tag2=t2.tag2;
+if $rows != 200000000 then
+  return -1
+endi
+
+system sh/exec.sh -n dnode1 -s stop -x SIGINT