MDEV-12756 rpl.rpl_killed_ddl fails in buildbot with 'Can't find record'

The issue was that my_errno was not set properly when a repair was killed,
which confused the rpl_killed_ddl script.

I also added an extra test line in varchar.inc to ensure we don't give
duplicate error rows.

mysql-test/include/varchar.inc

@@ -90,6 +90,7 @@ explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a  '
 --replace_regex /Duplicate entry '[^']+' for key/Duplicate entry '{ ' for key/
 --error ER_DUP_ENTRY
 alter table t1 add unique(v);
+show warnings;
 alter table t1 add key(v);
 select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a';
 --replace_column 6 # 9 # 10 #

mysql-test/r/mix2_myisam.result

@@ -1549,6 +1549,9 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
 alter table t1 add unique(v);
 ERROR 23000: Duplicate entry '{ ' for key 'v_2'
+show warnings;
+Level	Code	Message
+Error	1062	Duplicate entry 'a
' for key 'v_2'
 alter table t1 add key(v);
 Warnings:
 Note	1831	Duplicate index `v_2`. This is deprecated and will be disallowed in a future release

mysql-test/r/mrr_icp_extra.result

@@ -350,6 +350,9 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
 alter table t1 add unique(v);
 ERROR 23000: Duplicate entry '{ ' for key 'v_2'
+show warnings;
+Level	Code	Message
+Error	1062	Duplicate entry 'a
' for key 'v_2'
 alter table t1 add key(v);
 Warnings:
 Note	1831	Duplicate index `v_2`. This is deprecated and will be disallowed in a future release

mysql-test/r/myisam.result

@@ -1255,6 +1255,9 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
 alter table t1 add unique(v);
 ERROR 23000: Duplicate entry '{ ' for key 'v_2'
+show warnings;
+Level	Code	Message
+Error	1062	Duplicate entry 'a
' for key 'v_2'
 alter table t1 add key(v);
 Warnings:
 Note	1831	Duplicate index `v_2`. This is deprecated and will be disallowed in a future release

mysql-test/suite/innodb/r/innodb.result

@@ -1917,6 +1917,9 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
 alter table t1 add unique(v);
 ERROR 23000: Duplicate entry '{ ' for key 'v_2'
+show warnings;
+Level	Code	Message
+Error	1062	Duplicate entry 'v' for key 'v_2'
 alter table t1 add key(v);
 Warnings:
 Note	1831	Duplicate index `v_2`. This is deprecated and will be disallowed in a future release

mysql-test/suite/maria/maria.result

@@ -1145,6 +1145,9 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	v	v	13	const	#	Using where; Using index
 alter table t1 add unique(v);
 ERROR 23000: Duplicate entry '{ ' for key 'v_2'
+show warnings;
+Level	Code	Message
+Error	1062	Duplicate entry 'a
' for key 'v_2'
 alter table t1 add key(v);
 Warnings:
 Note	1831	Duplicate index `v_2`. This is deprecated and will be disallowed in a future release

sql/sql_table.cc

@@ -9938,6 +9938,8 @@ copy_data_between_tables(THD *thd, TABLE *from, TABLE *to,
   }
   if (to->file->ha_end_bulk_insert() && error <= 0)
   {
+    /* Give error, if not already given */
+    if (!thd->is_error())
       to->file->print_error(my_errno,MYF(0));
     error= 1;
   }

storage/maria/ha_maria.cc

@@ -834,7 +834,10 @@ extern "C" {
 
 int _ma_killed_ptr(HA_CHECK *param)
 {
-  return thd_killed((THD*)param->thd);
+  if (likely(thd_killed((THD*)param->thd)) == 0)
+    return 0;
+  my_errno= HA_ERR_ABORTED_BY_USER;
+  return 1;
 }
 
 
@@ -1668,9 +1671,12 @@ int ha_maria::repair(THD *thd, HA_CHECK *param, bool do_optimize)
       }
       if (error && file->create_unique_index_by_sort && 
           share->state.dupp_key != MAX_KEY)
+      {
+        my_errno= HA_ERR_FOUND_DUPP_KEY;
         print_keydup_error(table, &table->key_info[share->state.dupp_key], 
                            MYF(0));
       }
+    }
     else
     {
       thd_proc_info(thd, "Repair with keycache");

storage/maria/ma_check.c

@@ -1364,6 +1364,7 @@ static int check_dynamic_record(HA_CHECK *param, MARIA_HA *info, int extend,
         pos=block_info.filepos+block_info.block_len;
         if (block_info.rec_len > (uint) share->base.max_pack_length)
         {
+          my_errno= HA_ERR_WRONG_IN_RECORD;
           _ma_check_print_error(param,"Found too long record (%lu) at %s",
                                 (ulong) block_info.rec_len,
                                 llstr(start_recpos,llbuff));
@@ -4995,6 +4996,7 @@ static int sort_get_next_record(MARIA_SORT_PARAM *sort_param)
 	  param->error_printed=1;
           param->retry_repair=1;
           param->testflag|=T_RETRY_WITHOUT_QUICK;
+          my_errno= HA_ERR_WRONG_IN_RECORD;
 	  DBUG_RETURN(1);	/* Something wrong with data */
 	}
 	b_type= _ma_get_block_info(info, &block_info,-1,pos);
@@ -5268,6 +5270,7 @@ static int sort_get_next_record(MARIA_SORT_PARAM *sort_param)
 	param->error_printed=1;
         param->retry_repair=1;
         param->testflag|=T_RETRY_WITHOUT_QUICK;
+        my_errno= HA_ERR_WRONG_IN_RECORD;
 	DBUG_RETURN(1);		/* Something wrong with data */
       }
       sort_param->start_recpos=sort_param->pos;

storage/myisam/ha_myisam.cc

@@ -577,7 +577,10 @@ extern "C" {
 
 int killed_ptr(HA_CHECK *param)
 {
-  return thd_killed((THD*)param->thd);
+  if (likely(thd_killed((THD*)param->thd)) == 0)
+    return 0;
+  my_errno= HA_ERR_ABORTED_BY_USER;
+  return 1;
 }
 
 void mi_check_print_error(HA_CHECK *param, const char *fmt,...)
@@ -1213,6 +1216,11 @@ int ha_myisam::repair(THD *thd, HA_CHECK &param, bool do_optimize)
     if (remap)
       mi_munmap_file(file);
 #endif
+    /*
+      The following is to catch errors when my_errno is no set properly
+      during repairt
+    */
+    my_errno= 0;
     if (mi_test_if_sort_rep(file,file->state->records,tmp_key_map,0) &&
 	(local_testflag & T_REP_BY_SORT))
     {
@@ -1235,9 +1243,12 @@ int ha_myisam::repair(THD *thd, HA_CHECK &param, bool do_optimize)
       }
       if (error && file->create_unique_index_by_sort && 
           share->state.dupp_key != MAX_KEY)
+      {
+        my_errno= HA_ERR_FOUND_DUPP_KEY;
         print_keydup_error(table, &table->key_info[share->state.dupp_key],
                            MYF(0));
       }
+    }
     else
     {
       thd_proc_info(thd, "Repair with keycache");

storage/myisam/mi_check.c

@@ -3126,6 +3126,7 @@ static int sort_key_read(MI_SORT_PARAM *sort_param, void *key)
   }
   if (info->state->records == sort_info->max_records)
   {
+    my_errno= HA_ERR_WRONG_IN_RECORD;
     mi_check_print_error(sort_info->param,
 			 "Key %d - Found too many records; Can't continue",
                          sort_param->key+1);
@@ -3332,6 +3333,7 @@ static int sort_get_next_record(MI_SORT_PARAM *sort_param)
 	  param->error_printed=1;
           param->retry_repair=1;
           param->testflag|=T_RETRY_WITHOUT_QUICK;
+          my_errno= HA_ERR_WRONG_IN_RECORD;
 	  DBUG_RETURN(1);	/* Something wrong with data */
 	}
 	b_type=_mi_get_block_info(&block_info,-1,pos);
@@ -3590,6 +3592,7 @@ static int sort_get_next_record(MI_SORT_PARAM *sort_param)
 	param->error_printed=1;
         param->retry_repair=1;
         param->testflag|=T_RETRY_WITHOUT_QUICK;
+        my_errno= HA_ERR_WRONG_IN_RECORD;
 	DBUG_RETURN(1);		/* Something wrong with data */
       }
       sort_param->start_recpos=sort_param->pos;