Merge pull request #4221 from taosdata/hotfix/TD-2006

memory may corruption

src/query/inc/qHistogram.h

@@ -43,6 +43,8 @@ typedef struct SHistogramInfo {
   int32_t numOfElems;
   int32_t numOfEntries;
   int32_t maxEntries;
+  double min;
+  double max;
 
 #if defined(USE_ARRAYLIST)
   SHistBin* elems;
@@ -52,9 +54,6 @@ typedef struct SHistogramInfo {
   int32_t         maxIndex;
   bool            ordered;
 #endif
-
-  double min;
-  double max;
 } SHistogramInfo;
 
 SHistogramInfo* tHistogramCreate(int32_t numOfBins);