fix: explain with state window

source/libs/command/src/explain.c

@@ -1009,7 +1009,7 @@ int32_t qExplainResNodeToRowsImpl(SExplainResNode *pResNode, SExplainCtx *ctx, i
       SStateWinodwPhysiNode *pStateNode = (SStateWinodwPhysiNode *)pNode;
 
       EXPLAIN_ROW_NEW(level, EXPLAIN_STATE_WINDOW_FORMAT,
-                      nodesGetNameFromColumnNode(((STargetNode *)pStateNode->pStateKey)->pExpr));
+                      nodesGetNameFromColumnNode((SColumnNode*)pStateNode->pStateKey));
       EXPLAIN_ROW_APPEND(EXPLAIN_LEFT_PARENTHESIS_FORMAT);
       if (pResNode->pExecInfo) {
         QRY_ERR_RET(qExplainBufAppendExecInfo(pResNode->pExecInfo, tbuf, &tlen));