fix coverity issues

src/query/src/qast.c

@@ -577,8 +577,7 @@ static void tQueryIndexColumn(SSkipList* pSkipList, tQueryInfo* pQueryInfo, SArr
       assert(0);
     }
   } else {
-    int32_t optr = cond.end->optr;
-    
+    int32_t optr = cond.end ? cond.end->optr : TSDB_RELATION_INVALID;
     if (optr == TSDB_RELATION_LESS || optr == TSDB_RELATION_LESS_EQUAL) {
       bool comp = true;
       int32_t ret = 0;

src/query/src/qpercentile.c

@@ -283,7 +283,7 @@ tMemBucket *tMemBucketCreate(int32_t totalSlots, int32_t nBufferSize, int16_t nE
       break;
     };
     default: {
-      uError("MemBucket:%p,not support data type %d,failed", *pBucket, pBucket->dataType);
+      uError("MemBucket:%p,not support data type %d,failed", pBucket, pBucket->dataType);
       tfree(pBucket);
       return NULL;
     }

src/query/src/qtokenizer.c

@@ -655,4 +655,4 @@ SSQLToken tStrGetToken(char* str, int32_t* i, bool isPrevOptr, uint32_t numOfIgn
   return t0;
 }
 
-bool isKeyWord(const char* z, int32_t len) { return (tSQLKeywordCode((char*)z, len) != TK_ID); }
\ No newline at end of file
+bool isKeyWord(const char* z, int32_t len) { return (tSQLKeywordCode((char*)z, len) != TK_ID); }