From d1e25f9770246ceb85af25efec8eae8bec2f3026 Mon Sep 17 00:00:00 2001
From: "ingo@mysql.com" <>
Date: Mon, 10 Apr 2006 13:38:56 +0200
Subject: [PATCH] Bug#10405 - myisamchk damages auto_increment columns when
 changing character set

Whenever 'myisamchk' needed to recreate a table,
the auto increment information was lost.

Now the forgotten element of the table creation
information is set correctly.
---
 myisam/mi_check.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/myisam/mi_check.c b/myisam/mi_check.c
index a7c3d2a6f7e..38520095788 100644
--- a/myisam/mi_check.c
+++ b/myisam/mi_check.c
@@ -3415,6 +3415,7 @@ int recreate_table(MI_CHECK *param, MI_INFO **org_info, char *filename)
   ha_rows max_records;
   ulonglong file_length,tmp_length;
   MI_CREATE_INFO create_info;
+  DBUG_ENTER("recreate_table");
 
   error=1;					/* Default error */
   info= **org_info;
@@ -3424,7 +3425,7 @@ int recreate_table(MI_CHECK *param, MI_INFO **org_info, char *filename)
   unpack= (share.options & HA_OPTION_COMPRESS_RECORD) &&
     (param->testflag & T_UNPACK);
   if (!(keyinfo=(MI_KEYDEF*) my_alloca(sizeof(MI_KEYDEF)*share.base.keys)))
-    return 0;
+    DBUG_RETURN(0);
   memcpy((byte*) keyinfo,(byte*) share.keyinfo,
 	 (size_t) (sizeof(MI_KEYDEF)*share.base.keys));
 
@@ -3433,14 +3434,14 @@ int recreate_table(MI_CHECK *param, MI_INFO **org_info, char *filename)
 				       (key_parts+share.base.keys))))
   {
     my_afree((gptr) keyinfo);
-    return 1;
+    DBUG_RETURN(1);
   }
   if (!(recdef=(MI_COLUMNDEF*)
 	my_alloca(sizeof(MI_COLUMNDEF)*(share.base.fields+1))))
   {
     my_afree((gptr) keyinfo);
     my_afree((gptr) keysegs);
-    return 1;
+    DBUG_RETURN(1);
   }
   if (!(uniquedef=(MI_UNIQUEDEF*)
 	my_alloca(sizeof(MI_UNIQUEDEF)*(share.state.header.uniques+1))))
@@ -3448,7 +3449,7 @@ int recreate_table(MI_CHECK *param, MI_INFO **org_info, char *filename)
     my_afree((gptr) recdef);
     my_afree((gptr) keyinfo);
     my_afree((gptr) keysegs);
-    return 1;
+    DBUG_RETURN(1);
   }
 
   /* Copy the column definitions */
@@ -3521,6 +3522,11 @@ int recreate_table(MI_CHECK *param, MI_INFO **org_info, char *filename)
   create_info.language = (param->language ? param->language :
 			  share.state.header.language);
   create_info.key_file_length=  status_info.key_file_length;
+  /*
+    Allow for creating an auto_increment key. This has an effect only if
+    an auto_increment key exists in the original table.
+  */
+  create_info.with_auto_increment= TRUE;
   /* We don't have to handle symlinks here because we are using
      HA_DONT_TOUCH_DATA */
   if (mi_create(filename,
@@ -3565,7 +3571,7 @@ end:
   my_afree((gptr) keyinfo);
   my_afree((gptr) recdef);
   my_afree((gptr) keysegs);
-  return error;
+  DBUG_RETURN(error);
 }
 
 
@@ -3668,6 +3674,8 @@ void update_auto_increment_key(MI_CHECK *param, MI_INFO *info,
 			       my_bool repair_only)
 {
   byte *record;
+  DBUG_ENTER("update_auto_increment_key");
+
   if (!info->s->base.auto_key ||
       !(((ulonglong) 1 << (info->s->base.auto_key-1)
 	 & info->s->state.key_map)))
@@ -3676,7 +3684,7 @@ void update_auto_increment_key(MI_CHECK *param, MI_INFO *info,
       mi_check_print_info(param,
 			  "Table: %s doesn't have an auto increment key\n",
 			  param->isam_file_name);
-    return;
+    DBUG_VOID_RETURN;
   }
   if (!(param->testflag & T_SILENT) &&
       !(param->testflag & T_REP))
@@ -3689,7 +3697,7 @@ void update_auto_increment_key(MI_CHECK *param, MI_INFO *info,
 				  MYF(0))))
   {
     mi_check_print_error(param,"Not enough memory for extra record");
-    return;
+    DBUG_VOID_RETURN;
   }
 
   mi_extra(info,HA_EXTRA_KEYREAD,0);
@@ -3700,7 +3708,7 @@ void update_auto_increment_key(MI_CHECK *param, MI_INFO *info,
       mi_extra(info,HA_EXTRA_NO_KEYREAD,0);
       my_free((char*) record, MYF(0));
       mi_check_print_error(param,"%d when reading last record",my_errno);
-      return;
+      DBUG_VOID_RETURN;
     }
     if (!repair_only)
       info->s->state.auto_increment=param->auto_increment_value;
@@ -3716,7 +3724,7 @@ void update_auto_increment_key(MI_CHECK *param, MI_INFO *info,
   mi_extra(info,HA_EXTRA_NO_KEYREAD,0);
   my_free((char*) record, MYF(0));
   update_state_info(param, info, UPDATE_AUTO_INC);
-  return;
+  DBUG_VOID_RETURN;
 }
 
     /* calculate unique keys for each part key */