Merge Spider updates. Fixes

MDEV-4735 - Assertion `! is_set()' fails in Diagnostics_area::set_ok_status on
            attempt to create a temporary SPIDER table connecting to
            non-existing source
MDEV-4737 - Server crashes in spider_mysql_handler::append_match_against on
            SELECT .. MATCH .. AGAINST .. BOOLEAN MODE
MDEV-4738 - INSERT DELAYED on a SPIDER table doesn't produce
            ER_DELAYED_NOT_SUPPORTED, doesn't work like delayed, and doesn't
            honor lock_wait_timeout like normal INSERT

storage/spider/ha_spider.cc

@@ -1191,6 +1191,7 @@ THR_LOCK_DATA **ha_spider::store_lock(
         lock_type = TL_READ;
       if (
         lock_type >= TL_WRITE_CONCURRENT_INSERT && lock_type <= TL_WRITE &&
+        lock_type != TL_WRITE_DELAYED &&
         !thd->in_lock_tables && !thd_tablespace_op(thd)
       )
         lock_type = TL_WRITE_ALLOW_WRITE;
@@ -7597,6 +7598,12 @@ FT_INFO *ha_spider::ft_init_ext(
   DBUG_PRINT("info",("spider flags=%u", flags));
   DBUG_PRINT("info",("spider inx=%u", inx));
   DBUG_PRINT("info",("spider key=%s", key->c_ptr_safe()));
+  if (inx == NO_SUCH_KEY)
+  {
+    my_error(ER_FT_MATCHING_KEY_NOT_FOUND, MYF(0));
+    DBUG_RETURN(NULL);
+  }
+
   tmp_ft_info = ft_current;
   if (ft_current)
     ft_current = ft_current->next;
@@ -7611,7 +7618,7 @@ FT_INFO *ha_spider::ft_init_ext(
       spider_malloc(spider_current_trx, 2, sizeof(st_spider_ft_info),
         MYF(MY_WME | MY_ZEROFILL))))
     {
-      store_error_num = HA_ERR_OUT_OF_MEM;
+      my_error(HA_ERR_OUT_OF_MEM, MYF(0));
       DBUG_RETURN(NULL);
     }
     if (tmp_ft_info)

storage/spider/spd_table.cc

@@ -4512,18 +4512,24 @@ SPIDER_SHARE *spider_get_share(
         }
       }
 
-      spider_get_sts(share, spider->search_link_idx, tmp_time,
+      if (spider_get_sts(share, spider->search_link_idx, tmp_time,
         spider, sts_interval, sts_mode,
 #ifdef WITH_PARTITION_STORAGE_ENGINE
         sts_sync,
 #endif
-        1, HA_STATUS_VARIABLE | HA_STATUS_CONST | HA_STATUS_AUTO);
-      spider_get_crd(share, spider->search_link_idx, tmp_time,
+        1, HA_STATUS_VARIABLE | HA_STATUS_CONST | HA_STATUS_AUTO))
+      {
+        thd->clear_error();
+      }
+      if (spider_get_crd(share, spider->search_link_idx, tmp_time,
         spider, table, crd_interval, crd_mode,
 #ifdef WITH_PARTITION_STORAGE_ENGINE
         crd_sync,
 #endif
-        1);
+        1))
+      {
+        thd->clear_error();
+      }
 /*
       if (
         (*error_num = spider_get_sts(share, spider->search_link_idx, tmp_time,
@@ -4935,18 +4941,24 @@ SPIDER_SHARE *spider_get_share(
             }
           }
 
-          spider_get_sts(share, spider->search_link_idx,
+          if (spider_get_sts(share, spider->search_link_idx,
             tmp_time, spider, sts_interval, sts_mode,
 #ifdef WITH_PARTITION_STORAGE_ENGINE
             sts_sync,
 #endif
-            1, HA_STATUS_VARIABLE | HA_STATUS_CONST | HA_STATUS_AUTO);
-          spider_get_crd(share, spider->search_link_idx,
+            1, HA_STATUS_VARIABLE | HA_STATUS_CONST | HA_STATUS_AUTO))
+          {
+            thd->clear_error();
+          }
+          if (spider_get_crd(share, spider->search_link_idx,
             tmp_time, spider, table, crd_interval, crd_mode,
 #ifdef WITH_PARTITION_STORAGE_ENGINE
             crd_sync,
 #endif
-            1);
+            1))
+          {
+            thd->clear_error();
+          }
 /*
           if (
             (*error_num = spider_get_sts(share, spider->search_link_idx,