MDEV-28105 Return error in ha_spider::write_row() if info(HA_STATUS_AUTO) fails

Spider calls info with HA_STATUS_AUTO to update auto increment info,
which may attempt to connect the data node. If the connection fails,
it may emit an error and return the same error. This error should not
be of lower priority than any possible error from the later call to
handler::update_auto_increment().

Without this change, certain errors from update_auto_increment() such
as HA_ERR_AUTOINC_ERANGE may get ignored, causing my_insert() to call
my_ok(), which fails the assertion because the error was emitted in
the info() call (Diagnostics_area::is_set() returns true).

storage/spider/ha_spider.cc

@@ -9396,18 +9396,6 @@ int ha_spider::update_auto_increment()
   DBUG_ENTER("ha_spider::update_auto_increment");
   DBUG_PRINT("info",("spider this=%p", this));
   force_auto_increment = TRUE;
-/*
-  if (
-    next_insert_id >= auto_inc_interval_for_cur_row.maximum() &&
-    wide_handler->trx->thd->auto_inc_intervals_forced.get_current()
-  ) {
-    force_auto_increment = TRUE;
-    DBUG_PRINT("info",("spider force_auto_increment=TRUE"));
-  } else {
-    force_auto_increment = FALSE;
-    DBUG_PRINT("info",("spider force_auto_increment=FALSE"));
-  }
-*/
   DBUG_PRINT("info",("spider auto_increment_mode=%d",
     auto_increment_mode));
   DBUG_PRINT("info",("spider next_number_field=%lld",
@@ -9662,7 +9650,12 @@ int ha_spider::write_row(
         pthread_mutex_lock(&share->lgtm_tblhnd_share->auto_increment_mutex);
         if (!share->lgtm_tblhnd_share->auto_increment_init)
         {
-          info(HA_STATUS_AUTO);
+          if ((error_num= info(HA_STATUS_AUTO)))
+          {
+            pthread_mutex_unlock(
+              &share->lgtm_tblhnd_share->auto_increment_mutex);
+            DBUG_RETURN(error_num);
+          }
           share->lgtm_tblhnd_share->auto_increment_lclval =
             stats.auto_increment_value;
           share->lgtm_tblhnd_share->auto_increment_init = TRUE;

storage/spider/mysql-test/spider/bugfix/r/mdev_28105.result

+install soname 'ha_spider';
+Warnings:
+Warning	1105	Cannot enable tc-log at run-time. XA features of SPIDER are disabled
+SET @@insert_id=128;
+CREATE TABLE t(c TINYINT AUTO_INCREMENT KEY) ENGINE=Spider;
+INSERT IGNORE INTO t VALUES(0);
+ERROR HY000: Unable to connect to foreign data source: localhost
+drop table t;
+Warnings:
+Warning	1620	Plugin is busy and will be uninstalled on shutdown

storage/spider/mysql-test/spider/bugfix/t/mdev_28105.opt

+--skip-log-bin

storage/spider/mysql-test/spider/bugfix/t/mdev_28105.test

+install soname 'ha_spider';
+SET @@insert_id=128;  # 127 does not crash
+CREATE TABLE t(c TINYINT AUTO_INCREMENT KEY) ENGINE=Spider;
+--error ER_CONNECT_TO_FOREIGN_DATA_SOURCE
+INSERT IGNORE INTO t VALUES(0);
+drop table t;
+--disable_query_log
+--source ../../include/clean_up_spider.inc