enh: add merge case to ci and code optimization

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

@@ -1732,6 +1732,7 @@ static int32_t mergeTwoRowFromMem(STsdbReadHandle* pTsdbReadHandle, int32_t capa
           if (*lastRowKey != TSKEY_INITIAL_VAL) {
             ++(*curRow);
           }
+          *lastRowKey = rowKey;
           ++nResult;
         } else if (update) {
           mergeOption = 2;
@@ -1739,8 +1740,6 @@ static int32_t mergeTwoRowFromMem(STsdbReadHandle* pTsdbReadHandle, int32_t capa
           mergeOption = 0;
           break;
         }
-
-        *lastRowKey = rowKey;
       }
     } else {
       // TODO: use STSRowIter
@@ -1753,6 +1752,7 @@ static int32_t mergeTwoRowFromMem(STsdbReadHandle* pTsdbReadHandle, int32_t capa
           if (*lastRowKey != TSKEY_INITIAL_VAL) {
             ++(*curRow);
           }
+          *lastRowKey = rowKey;
           ++nResult;
         } else if (update) {
           mergeOption = 2;
@@ -1760,7 +1760,6 @@ static int32_t mergeTwoRowFromMem(STsdbReadHandle* pTsdbReadHandle, int32_t capa
           mergeOption = 0;
           break;
         }
-        *lastRowKey = rowKey;
       } else {
         SKvRowIdx* pColIdx = tdKvRowColIdxAt(row, chosen_itr - 1);
         colId = pColIdx->colId;

tests/script/jenkins/basic.txt

@@ -29,6 +29,7 @@
 ./test.sh -f tsim/insert/backquote.sim
 ./test.sh -f tsim/insert/null.sim
 ./test.sh -f tsim/insert/update0.sim
+./test.sh -f tsim/insert/commit-merge0.sim
 
 # ---- parser
 ./test.sh -f tsim/parser/groupby-basic.sim