fix: plan problem caused by partition by tbname interval optimize

source/libs/planner/src/planSpliter.c

@@ -657,6 +657,9 @@ static int32_t stbSplSplitWindowForPartTable(SSplitContext* pCxt, SStableSplitIn
     return TSDB_CODE_SUCCESS;
   }
 
+  if (NULL != pInfo->pSplitNode->pParent && QUERY_NODE_LOGIC_PLAN_FILL == nodeType(pInfo->pSplitNode->pParent)) {
+    pInfo->pSplitNode = pInfo->pSplitNode->pParent;
+  }
   SExchangeLogicNode* pExchange = NULL;
   int32_t             code = splCreateExchangeNode(pCxt, pInfo->pSplitNode, &pExchange);
   if (TSDB_CODE_SUCCESS == code) {

source/libs/planner/test/planIntervalTest.cpp

@@ -41,6 +41,9 @@ TEST_F(PlanIntervalTest, fill) {
   run("SELECT COUNT(*), SUM(c1) FROM t1 "
       "WHERE ts > TIMESTAMP '2022-04-01 00:00:00' and ts < TIMESTAMP '2022-04-30 23:59:59' "
       "INTERVAL(10s) FILL(VALUE, 10, 20)");
+
+  run("SELECT COUNT(*) FROM st1 WHERE ts > TIMESTAMP '2022-04-01 00:00:00' and ts < TIMESTAMP '2022-04-30 23:59:59' "
+      "PARTITION BY TBNAME interval(10s) fill(prev)");
 }
 
 TEST_F(PlanIntervalTest, selectFunc) {