Merge pull request #15247 from taosdata/fix/TD-17668

fix: fix explain crash issue

source/libs/command/src/explain.c

@@ -401,8 +401,6 @@ int32_t qExplainResNodeToRowsImpl(SExplainResNode *pResNode, SExplainCtx *ctx, i
         QRY_ERR_RET(qExplainBufAppendExecInfo(pResNode->pExecInfo, tbuf, &tlen));
         EXPLAIN_ROW_APPEND(EXPLAIN_BLANK_FORMAT);
       }
-      EXPLAIN_ROW_APPEND(EXPLAIN_COLUMNS_FORMAT, pTagScanNode->pScanCols->length);
-      EXPLAIN_ROW_APPEND(EXPLAIN_BLANK_FORMAT);
       if (pTagScanNode->pScanPseudoCols) {
         EXPLAIN_ROW_APPEND(EXPLAIN_PSEUDO_COLUMNS_FORMAT, pTagScanNode->pScanPseudoCols->length);
         EXPLAIN_ROW_APPEND(EXPLAIN_BLANK_FORMAT);