MDEV-28269 Assertion `save_errno' in maria_write or ER_GET_ERRNO

The issue was that the value of MARIA_FOUND_WRONG_KEY was a value
that could be returned by ha_key_cmp.

This was already fixed in MyISAM, now using the same fix in Aria:
Setting the value to INT_MAX32, which should be impossible in any
normal cases.

I also fixed so that if there is a wrong key, we now get a proper error
message and not an assert.

Author: montywi

mysql-test/suite/maria/maria.result

@@ -2882,3 +2882,15 @@ key(c, a), unique(b)
 partition by hash (b);
 replace into t1 values (1, 0, 0), (2, 0, 0), (0, 0, 0);
 drop table t1;
+#
+# MDEV-28269 Assertion `save_errno' in maria_write or ER_GET_ERRNO
+#
+connect  session1,localhost,root,,;
+SET big_tables= on;
+SET NAMES 'sjis';
+SELECT 'למטה' AS a UNION SELECT 'Wetter' AS a;
+a
+למט�?
+Wetter
+connection default;
+disconnect session1;

mysql-test/suite/maria/maria.test

@@ -1430,7 +1430,7 @@ CREATE TABLE t1 (
 ) ENGINE=aria DEFAULT CHARSET=utf8 PACK_KEYS=0;
 let $MYSQLD_DATADIR= `select @@datadir`;
 --replace_result $MYSQLD_DATADIR MYSQLD_DATADIR
---exec $MARIA_CHK -d $MYSQLD_DATADIR/test/t1
+--exec $MARIA_CHK -d --ignore-control-file $MYSQLD_DATADIR/test/t1
 DROP TABLE t1;
 
 # Test warnings with transactional=1 with MyISAM
@@ -2105,3 +2105,14 @@ partition by hash (b);
 replace into t1 values (1, 0, 0), (2, 0, 0), (0, 0, 0);
 # cleanup
 drop table t1;
+
+--echo #
+--echo # MDEV-28269 Assertion `save_errno' in maria_write or ER_GET_ERRNO
+--echo #
+
+connect (session1,localhost,root,,);
+SET big_tables= on;
+SET NAMES 'sjis';
+SELECT 'למטה' AS a UNION SELECT 'Wetter' AS a;
+connection default;
+disconnect session1;

storage/maria/ma_write.c

@@ -728,7 +728,10 @@ static int w_search(register MARIA_HA *info, uint32 comp_flag, MARIA_KEY *key,
     }
   }
   if (flag == MARIA_FOUND_WRONG_KEY)
+  {
+    my_errno= HA_ERR_CRASHED;
     goto err;
+  }
   if (!was_last_key)
     insert_last=0;
   next_page= _ma_kpos(page.node, keypos);

storage/maria/maria_def.h

@@ -887,7 +887,8 @@ struct st_maria_handler
 #define PACK_TYPE_SELECTED	1U	/* Bits in field->pack_type */
 #define PACK_TYPE_SPACE_FIELDS	2U
 #define PACK_TYPE_ZERO_FILL	4U
-#define MARIA_FOUND_WRONG_KEY 32768U	/* Impossible value from ha_key_cmp */
+
+#define MARIA_FOUND_WRONG_KEY INT_MAX32	/* Impossible value from ha_key_cmp */
 
 #define MARIA_BLOCK_SIZE(key_length,data_pointer,key_pointer,block_size)  (((((key_length)+(data_pointer)+(key_pointer))*4+(key_pointer)+2)/(block_size)+1)*(block_size))
 #define MARIA_MAX_KEYPTR_SIZE	5	/* For calculating block lengths */