[td-5176]<enhance>: improve the twa query performance in case of interval query.

src/query/inc/qExecutor.h

@@ -105,7 +105,7 @@ typedef struct SResultRowInfo {
   int16_t      type:8;     // data type for hash key
   int32_t      size:24;    // number of result set
   int32_t      capacity;   // max capacity
-  SResultRow*  current;    // current active result row
+  int32_t      curPos;     // current active result row index of pResult list
 } SResultRowInfo;
 
 typedef struct SColumnFilterElem {
@@ -423,7 +423,7 @@ typedef struct STagScanInfo {
   SColumnInfo* pCols;
   SSDataBlock* pRes;
   int32_t      totalTables;
-  int32_t      currentIndex;
+  int32_t      curPos;
 } STagScanInfo;
 
 typedef struct SOptrBasicInfo {

src/query/src/qUtil.c

@@ -44,8 +44,7 @@ int32_t getOutputInterResultBufSize(SQueryAttr* pQueryAttr) {
 int32_t initResultRowInfo(SResultRowInfo *pResultRowInfo, int32_t size, int16_t type) {
   pResultRowInfo->type     = type;
   pResultRowInfo->size     = 0;
-//  pResultRowInfo->prevSKey = TSKEY_INITIAL_VAL;
-  pResultRowInfo->current  = NULL;
+  pResultRowInfo->curPos  = -1;
   pResultRowInfo->capacity = size;
 
   pResultRowInfo->pResult = calloc(pResultRowInfo->capacity, POINTER_BYTES);
@@ -92,8 +91,7 @@ void resetResultRowInfo(SQueryRuntimeEnv *pRuntimeEnv, SResultRowInfo *pResultRo
   }
 
   pResultRowInfo->size     = 0;
-  pResultRowInfo->current  = NULL;
-//  pResultRowInfo->prevSKey = TSKEY_INITIAL_VAL;
+  pResultRowInfo->curPos  = -1;
 }
 
 int32_t numOfClosedResultRows(SResultRowInfo *pResultRowInfo) {