tsdb/cache: reuse pDataFileReader for same fileset

source/dnode/vnode/src/inc/tsdb.h

@@ -877,6 +877,7 @@ typedef struct SCacheRowsReader {
   SSHashObj              *pTableMap;
   SArray                 *pLDataIterArray;
   struct SDataFileReader *pFileReader;
+  STFileSet              *pCurFileSet;
   STsdbReadSnap          *pReadSnap;
   char                   *idstr;
   int64_t                 lastTs;

source/dnode/vnode/src/tsdb/tsdbCache.c

@@ -1949,6 +1949,7 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow, bool *pIgnoreEarlie
 
     STFileObj **pFileObj = state->pFileSet->farr;
     if (pFileObj[0] != NULL || pFileObj[3] != NULL) {
+      if (state->pFileSet != state->pr->pCurFileSet) {
         SDataFileReaderConfig conf = {.tsdb = state->pTsdb, .szPage = state->pTsdb->pVnode->config.szPage};
         const char           *filesName[4] = {0};
         if (pFileObj[0] != NULL) {
@@ -1978,6 +1979,9 @@ static int32_t getNextRowFromFS(void *iter, TSDBROW **ppRow, bool *pIgnoreEarlie
 
         loadDataTomb(state->pr, state->pr->pFileReader);
 
+        state->pr->pCurFileSet = state->pFileSet;
+      }
+
       if (!state->pIndexList) {
         state->pIndexList = taosArrayInit(1, sizeof(SBrinBlk));
       } else {
@@ -2218,19 +2222,6 @@ _err:
   return code;
 }
 
-int32_t clearNextRowFromFS(void *iter) {
-  int32_t code = 0;
-
-  SFSNextRowIter *state = (SFSNextRowIter *)iter;
-  if (!state) {
-    return code;
-  }
-
-  clearLastFileSet(state);
-
-  return code;
-}
-
 typedef enum SMEMNEXTROWSTATES {
   SMEMNEXTROW_ENTER,
   SMEMNEXTROW_NEXT,
@@ -2350,6 +2341,36 @@ typedef struct CacheNextRowIter {
   STsdb            *pTsdb;
 } CacheNextRowIter;
 
+int32_t clearNextRowFromFS(void *iter) {
+  int32_t code = 0;
+
+  SFSNextRowIter *state = (SFSNextRowIter *)iter;
+  if (!state) {
+    return code;
+  }
+
+  if (state->pLastIter) {
+    lastIterClose(&state->pLastIter);
+  }
+
+  if (state->pBlockData) {
+    tBlockDataDestroy(state->pBlockData);
+    state->pBlockData = NULL;
+  }
+
+  if (state->pTSRow) {
+    taosMemoryFree(state->pTSRow);
+    state->pTSRow = NULL;
+  }
+
+  if (state->pRowIter->pSkyline) {
+    taosArrayDestroy(state->pRowIter->pSkyline);
+    state->pRowIter->pSkyline = NULL;
+  }
+
+  return code;
+}
+
 static void clearLastFileSet(SFSNextRowIter *state) {
   if (state->pLastIter) {
     lastIterClose(&state->pLastIter);
@@ -2363,6 +2384,8 @@ static void clearLastFileSet(SFSNextRowIter *state) {
   if (state->pr->pFileReader) {
     tsdbDataFileReaderClose(&state->pr->pFileReader);
     state->pr->pFileReader = NULL;
+
+    state->pr->pCurFileSet = NULL;
   }
 
   if (state->pTSRow) {