Fixed MDEV-8408

Assertion `inited==INDEX' failed in int handler::ha_index_first(uchar*)

The crash was because errors from init_read_record_idx() was not taken care of.

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

+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+CREATE TABLE IF NOT EXISTS t1 (pk INT PRIMARY KEY, i INT, KEY(i)) ENGINE=InnoDB;
+UPDATE t1 SET i = 0;
+ERROR HY000: Table definition has changed, please retry transaction
+UPDATE t1 SET pk = 0;
+ERROR HY000: Table definition has changed, please retry transaction
+commit;
+drop table t1;

mysql-test/suite/innodb/t/snapshot.test

+
+--source include/have_log_bin.inc
+--source include/have_binlog_format_row.inc
+--source include/have_innodb.inc
+
+START TRANSACTION WITH CONSISTENT SNAPSHOT;
+
+--connect (con1,localhost,root,,test)
+CREATE TABLE IF NOT EXISTS t1 (pk INT PRIMARY KEY, i INT, KEY(i)) ENGINE=InnoDB;
+
+--connection default
+--error 1412
+UPDATE t1 SET i = 0;
+--error 1412
+UPDATE t1 SET pk = 0;
+commit;
+
+drop table t1;

sql/records.cc

@@ -66,10 +66,12 @@ static int rr_index_desc(READ_RECORD *info);
   @param reverse      Scan in the reverse direction
 */
 
-void init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
+bool init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
                           bool print_error, uint idx, bool reverse)
 {
   int error;
+  DBUG_ENTER("init_read_record_idx");
+
   empty_record(table);
   bzero((char*) info,sizeof(*info));
   info->thd= thd;
@@ -88,6 +90,7 @@ void init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
 
   /* read_record will be changed to rr_index in rr_index_first */
   info->read_record= reverse ? rr_index_last : rr_index_first;
+  DBUG_RETURN(error != 0);
 }
 
 

sql/records.h

@@ -76,7 +76,7 @@ public:
 bool init_read_record(READ_RECORD *info, THD *thd, TABLE *reg_form,
 		      SQL_SELECT *select, int use_record_cache,
                       bool print_errors, bool disable_rr_cache);
-void init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
+bool init_read_record_idx(READ_RECORD *info, THD *thd, TABLE *table,
                           bool print_error, uint idx, bool reverse);
 void end_read_record(READ_RECORD *info);
 

sql/sql_delete.cc

@@ -508,17 +508,18 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
     free_underlaid_joins(thd, select_lex);
     DBUG_RETURN(TRUE);
   }
+
   if (query_plan.index == MAX_KEY || (select && select->quick))
+    error= init_read_record(&info, thd, table, select, 1, 1, FALSE);
+  else
+    error= init_read_record_idx(&info, thd, table, 1, query_plan.index,
+                                reverse);
+  if (error)
   {
-    if (init_read_record(&info, thd, table, select, 1, 1, FALSE))
-    {
-      delete select;
-      free_underlaid_joins(thd, select_lex);
-      DBUG_RETURN(TRUE);
-    }
+    delete select;
+    free_underlaid_joins(thd, select_lex);
+    DBUG_RETURN(TRUE);
   }
-  else
-    init_read_record_idx(&info, thd, table, 1, query_plan.index, reverse);
 
   init_ftfuncs(thd, select_lex, 1);
   THD_STAGE_INFO(thd, stage_updating);

sql/sql_update.cc

@@ -459,7 +459,8 @@ int mysql_update(THD *thd,
   query_plan.scanned_rows= select? select->records: table->file->stats.records;
         
   if (select && select->quick && select->quick->unique_key_range())
-  { // Single row select (always "ordered"): Ok to use with key field UPDATE
+  {
+    /* Single row select (always "ordered"): Ok to use with key field UPDATE */
     need_sort= FALSE;
     query_plan.index= MAX_KEY;
     used_key_is_modified= FALSE;
@@ -468,7 +469,8 @@ int mysql_update(THD *thd,
   {
     ha_rows scanned_limit= query_plan.scanned_rows;
     query_plan.index= get_index_for_order(order, table, select, limit,
-                                          &scanned_limit, &need_sort, &reverse);
+                                          &scanned_limit, &need_sort,
+                                          &reverse);
     if (!need_sort)
       query_plan.scanned_rows= scanned_limit;
 
@@ -481,12 +483,15 @@ int mysql_update(THD *thd,
     else
     {
       if (need_sort)
-      { // Assign table scan index to check below for modified key fields:
+      {
+        /* Assign table scan index to check below for modified key fields: */
         query_plan.index= table->file->key_used_on_scan;
       }
       if (query_plan.index != MAX_KEY)
-      { // Check if we are modifying a key that we are used to search with:
-        used_key_is_modified= is_key_used(table, query_plan.index, table->write_set);
+      {
+        /* Check if we are modifying a key that we are used to search with: */
+        used_key_is_modified= is_key_used(table, query_plan.index,
+                                          table->write_set);
       }
     }
   }
@@ -597,19 +602,20 @@ int mysql_update(THD *thd,
         B. query_plan.index != MAX_KEY
            B.1 quick select is used, start the scan with init_read_record
            B.2 quick select is not used, this is full index scan (with LIMIT)
-               Full index scan must be started with init_read_record_idx
+           Full index scan must be started with init_read_record_idx
       */
 
       if (query_plan.index == MAX_KEY || (select && select->quick))
+        error= init_read_record(&info, thd, table, select, 0, 1, FALSE);
+      else
+        error= init_read_record_idx(&info, thd, table, 1, query_plan.index,
+                                    reverse);
+
+      if (error)
       {
-        if (init_read_record(&info, thd, table, select, 0, 1, FALSE))
-        {
-          close_cached_file(&tempfile);
-          goto err;
-        }
+        close_cached_file(&tempfile);
+        goto err;
       }
-      else
-        init_read_record_idx(&info, thd, table, 1, query_plan.index, reverse);
 
       THD_STAGE_INFO(thd, stage_searching_rows_for_update);
       ha_rows tmp_limit= limit;