fix: save sort exec info into table merge scan struct and use it when explain

source/libs/executor/inc/executorimpl.h

@@ -359,6 +359,8 @@ typedef struct STableMergeScanInfo {
   // window to check if current data block needs to be loaded.
   SInterval       interval;
   SSampleExecInfo sample;  // sample execution info
+
+  SSortExecInfo sortExecInfo;
 } STableMergeScanInfo;
 
 typedef struct STagScanInfo {

source/libs/executor/src/scanoperator.c

@@ -2831,6 +2831,13 @@ int32_t stopGroupTableMergeScan(SOperatorInfo* pOperator) {
 
   size_t numReaders = taosArrayGetSize(pInfo->dataReaders);
 
+  SSortExecInfo sortExecInfo = tsortGetSortExecInfo(pInfo->pSortHandle);
+  pInfo->sortExecInfo.sortMethod = sortExecInfo.sortMethod;
+  pInfo->sortExecInfo.sortBuffer = sortExecInfo.sortBuffer;
+  pInfo->sortExecInfo.loops += sortExecInfo.loops;
+  pInfo->sortExecInfo.readBytes += sortExecInfo.readBytes;
+  pInfo->sortExecInfo.writeBytes += sortExecInfo.writeBytes;
+
   for (int32_t i = 0; i < numReaders; ++i) {
     STableMergeScanSortSourceParam* param = taosArrayGet(pInfo->sortSourceParams, i);
     blockDataDestroy(param->inputBlock);
@@ -2955,7 +2962,7 @@ int32_t getTableMergeScanExplainExecInfo(SOperatorInfo* pOptr, void** pOptrExpla
   STableMergeScanExecInfo* execInfo = taosMemoryCalloc(1, sizeof(STableMergeScanExecInfo));
   STableMergeScanInfo*     pInfo = pOptr->info;
   execInfo->blockRecorder = pInfo->readRecorder;
-  execInfo->sortExecInfo = tsortGetSortExecInfo(pInfo->pSortHandle);
+  execInfo->sortExecInfo = pInfo->sortExecInfo;
 
   *pOptrExplain = execInfo;
   *len = sizeof(STableMergeScanExecInfo);