Fix for BUG#10244:

Make get_quick_select_for_ref() accept estimated # records as parameter and 
set QUICK_RANGE_SELECT::records, as this value is used to allocate buffers 
in Multi-Range Read. 

sql/opt_range.cc

@@ -5513,14 +5513,26 @@ bool QUICK_ROR_UNION_SELECT::check_if_keys_used(List<Item> *fields)
 }
 
 
-/****************************************************************************
-  Create a QUICK RANGE based on a key
-  This allocates things in a new memory root, as this may be called many times
-  during a query.
-****************************************************************************/
+/*
+  Create quick select from ref/ref_or_null scan.
+  SYNOPSIS
+    get_quick_select_for_ref()
+      thd      Thread handle
+      table    Table to access
+      ref      ref[_or_null] scan parameters
+      records  Estimate of number of records (needed only to construct 
+               quick select)
+  NOTES
+    This allocates things in a new memory root, as this may be called many
+    times during a query.
+  
+  RETURN 
+    Quick select that retrieves the same rows as passed ref scan
+    NULL on error.
+*/
 
 QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
-                                             TABLE_REF *ref)
+                                             TABLE_REF *ref, ha_rows records)
 {
   MEM_ROOT *old_root= thd->mem_root;
   /* The following call may change thd->mem_root */
@@ -5537,6 +5549,7 @@ QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
     delete quick;
     goto err;
   }
+  quick->records= records;
 
   if (cp_buffer_from_ref(thd,ref) && thd->is_fatal_error ||
       !(range= new QUICK_RANGE()))

sql/opt_range.h

@@ -281,7 +281,8 @@ class QUICK_RANGE_SELECT : public QUICK_SELECT_I
   friend class TRP_ROR_INTERSECT;
   friend
   QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
-                                               struct st_table_ref *ref);
+                                               struct st_table_ref *ref,
+                                               ha_rows records);
   friend bool get_quick_keys(struct st_qsel_param *param,
                              QUICK_RANGE_SELECT *quick,KEY_PART *key,
                              SEL_ARG *key_tree,
@@ -709,5 +710,6 @@ class FT_SELECT: public QUICK_RANGE_SELECT {
 };
 
 QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table,
-                                             struct st_table_ref *ref);
+                                             struct st_table_ref *ref,
+                                             ha_rows records);
 #endif

sql/sql_select.cc

@@ -10971,7 +10971,8 @@ create_sort_index(THD *thd, JOIN *join, ORDER *order,
       */
       if (!(select->quick= (tab->type == JT_FT ?
 			    new FT_SELECT(thd, table, tab->ref.key) :
-			    get_quick_select_for_ref(thd, table, &tab->ref))))
+			    get_quick_select_for_ref(thd, table, &tab->ref, 
+                                                     tab->found_records))))
 	goto err;
     }
   }