MDEV-5299 crash at using show index

storage/spider/ha_spider.cc

@@ -8100,11 +8100,31 @@ int ha_spider::info(
           if (sts_interval == 0)
             pthread_mutex_lock(&share->sts_mutex);
           if (difftime(tmp_time, share->sts_get_time) >= sts_interval)
+          {
+            if ((error_num = spider_check_trx_and_get_conn(ha_thd(), this,
+              FALSE)))
+            {
+              if (!share->sts_init)
               {
                 if (
-              (error_num = spider_check_trx_and_get_conn(ha_thd(), this,
-                FALSE)) ||
-              (error_num = spider_get_sts(share, search_link_idx, tmp_time,
+                  spider_init_error_table ||
+                  (spider_init_error_table =
+                    spider_get_init_error_table(trx, share, TRUE))
+                ) {
+                  spider_init_error_table->init_error = error_num;
+                  if ((spider_init_error_table->init_error_with_message =
+                    thd->is_error()))
+                    strmov(spider_init_error_table->init_error_msg,
+                      spider_stmt_da_message(thd));
+                  spider_init_error_table->init_error_time =
+                    (time_t) time((time_t*) 0);
+                }
+                share->init_error = TRUE;
+                share->init = TRUE;
+              }
+              DBUG_RETURN(check_error_mode(error_num));
+            }
+            if ((error_num = spider_get_sts(share, search_link_idx, tmp_time,
                 this, sts_interval, sts_mode,
 #ifdef WITH_PARTITION_STORAGE_ENGINE
                 sts_sync,
@@ -8546,6 +8566,10 @@ int ha_spider::check_crd()
   }
   if (crd_mode == 3)
     crd_mode = 1;
+  if ((error_num = spider_check_trx_and_get_conn(ha_thd(), this, FALSE)))
+  {
+    DBUG_RETURN(check_error_mode(error_num));
+  }
   dbton_id = share->sql_dbton_ids[search_link_idx];
   dbton_hdl = dbton_handler[dbton_id];
   crd_mode = dbton_hdl->crd_mode_exchange(crd_mode);

storage/spider/spd_trx.cc

@@ -3425,8 +3425,6 @@ int spider_check_trx_and_get_conn(
     DBUG_PRINT("info",("spider semi_table_lock = %d",
       spider_param_semi_table_lock(thd, share->semi_table_lock)));
     DBUG_PRINT("info",("spider first_byte = %d", first_byte));
-    DBUG_PRINT("info",("spider link_status = %ld",
-      share->link_statuses[spider->conn_link_idx[spider->search_link_idx]]));
     if (
       !trx_ha ||
       trx_ha->wait_for_reusing ||
@@ -3618,6 +3616,8 @@ int spider_check_trx_and_get_conn(
 #endif
       }
     } else {
+      DBUG_PRINT("info",("spider link_status = %ld",
+        share->link_statuses[spider->conn_link_idx[spider->search_link_idx]]));
       for (
         roop_count = spider_conn_link_idx_next(share->link_statuses,
           spider->conn_link_idx, -1, share->link_count,