[TD-10700]<fix>: fixed alter tag modify tag lengh clause when escape

characters applied

src/client/src/tscSQLParser.c

@@ -6375,6 +6375,12 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
     SColumnIndex columnIndex = COLUMN_INDEX_INITIALIZER;
     SStrToken    name = {.type = TK_STRING, .z = pItem->name, .n = (uint32_t)strlen(pItem->name)};
+    //handle Escape character backstick
+    if (name.z[0] == TS_ESCAPE_CHAR && name.z[name.n - 1] == TS_ESCAPE_CHAR) {
+      memmove(name.z, name.z + 1, name.n);
+      name.z[name.n - TS_ESCAPE_CHAR_SIZE] = '\0';
+      name.n -= TS_ESCAPE_CHAR_SIZE;
+    }
     if (getColumnIndexByName(&name, pQueryInfo, &columnIndex, tscGetErrorMsgPayload(pCmd)) != TSDB_CODE_SUCCESS) {
       return invalidOperationMsg(pMsg, msg17);
     }