BUG#17138: Crash in stored procedure after fatal error that wasn't a real fatal error

sql/handler.h:
  Handle HA_ERR_FOUND_DUPP_KEY and HA_ERR_FOUND_DUPP_UNIQUE similarly
sql/item_sum.cc:
  fix
sql/sql_select.cc:
  fix

sql/handler.h

@@ -977,6 +977,9 @@ public:
     ignorable than others. E.g. the partition handler can get inserts
     into a range where there is no partition and this is an ignorable
     error.
+    HA_ERR_FOUND_DUPP_UNIQUE is a special case in MyISAM that means the
+    same thing as HA_ERR_FOUND_DUPP_KEY but can in some cases lead to
+    a slightly different error message.
   */
 #define HA_CHECK_DUPP_KEY 1
 #define HA_CHECK_DUPP_UNIQUE 2
@@ -985,9 +988,8 @@ public:
   {
     if (!error ||
         ((flags & HA_CHECK_DUPP_KEY) &&
-         error == HA_ERR_FOUND_DUPP_KEY) ||
-         ((flags & HA_CHECK_DUPP_UNIQUE) &&
-          error == HA_ERR_FOUND_DUPP_UNIQUE))
+         (error == HA_ERR_FOUND_DUPP_KEY ||
+          error == HA_ERR_FOUND_DUPP_UNIQUE)))
       return FALSE;
     return TRUE;
   }

sql/item_sum.cc

@@ -2663,8 +2663,7 @@ bool Item_sum_count_distinct::add()
     return tree->unique_add(table->record[0] + table->s->null_bytes);
   }
   if ((error= table->file->ha_write_row(table->record[0])) &&
-      error != HA_ERR_FOUND_DUPP_KEY &&
-      error != HA_ERR_FOUND_DUPP_UNIQUE)
+      table->file->cannot_ignore_error(error, HA_CHECK_DUPP))
     return TRUE;
   return FALSE;
 }

sql/sql_select.cc

@@ -9354,9 +9354,9 @@ bool create_myisam_from_heap(THD *thd, TABLE *table, TMP_TABLE_PARAM *param,
   /* copy row that filled HEAP table */
   if ((write_err=new_table.file->write_row(table->record[0])))
   {
-    if (write_err != HA_ERR_FOUND_DUPP_KEY &&
-	write_err != HA_ERR_FOUND_DUPP_UNIQUE || !ignore_last_dupp_key_error)
-    goto err;
+    if (new_table.file->cannot_ignore_error(write_err, HA_CHECK_DUPP) ||
+	!ignore_last_dupp_key_error)
+      goto err;
   }
 
   /* remove heap table and change to use myisam table */
@@ -10777,8 +10777,7 @@ end_write(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
       join->found_records++;
       if ((error=table->file->write_row(table->record[0])))
       {
-	if (error == HA_ERR_FOUND_DUPP_KEY ||
-	    error == HA_ERR_FOUND_DUPP_UNIQUE)
+        if (table->file->cannot_ignore_error(error, HA_CHECK_DUPP))
 	  goto end;
 	if (create_myisam_from_heap(join->thd, table, &join->tmp_table_param,
 				    error,1))