From: Roy Lyseng
Date: March 22 2012 1:19pm
Subject: bzr push into mysql-trunk branch (roy.lyseng:3831 to 3832) Bug#13846687
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 3832 Roy Lyseng	2012-03-22
      Bug#13846687: Assert 'tab->use_join_cache == ALG_NONE' in setup_join_buffering
      
      There were two bugs when handling more than one semi-join nest when
      setting up a FirstMatch strategy.
      
      The first problem turned out to be a duplicate of bug#13685026.
      
      The second problem was that
      Optimize_table_order::semijoin_firstmatch_loosescan_access_paths needs
      to calculate the number of semi-join inner tables, in order to see if
      join buffering can be used. The code anticipated that only one semi-join
      nest could be handled by the FirstMatch strategy.
      
      There are currently no wrong results caused by this, but it is
      nevertheless good to fix this code.
      
      sql/sql_planner.cc
        In Optimize_table_order::semijoin_firstmatch_loosescan_access_paths(),
        calculate the number of semi-join inner tables by looping over the set
        of handled tables and count those that are within a semi-join nest.

    modified:
      sql/sql_planner.cc
 3831 Matthias.Leich	2012-03-22
      Fix for Bug#13840762 - A TEST FOR INNODB WITH DIFFERENT PAGESIZES IS MISSING

    added:
      mysql-test/include/search_pattern_in_file.inc
      mysql-test/suite/innodb/r/innodb_page_size_func.result
      mysql-test/suite/innodb/t/innodb_page_size_func.test
=== modified file 'sql/sql_planner.cc'
--- a/sql/sql_planner.cc	2012-03-22 08:17:51 +0000
+++ b/sql/sql_planner.cc	2012-03-22 13:11:37 +0000
@@ -2759,9 +2759,14 @@ bool Optimize_table_order::semijoin_firs
     rowcount= positions[first_tab - 1].prefix_record_count;
   }
 
-  const uint table_count=
-    my_count_bits(positions[first_tab].table->emb_sj_nest->sj_inner_tables);
+  uint table_count= 0;
   uint no_jbuf_before;
+  for (uint i= first_tab; i <= last_tab; i++)
+  {
+    remaining_tables|= positions[i].table->table->map;
+    if (positions[i].table->emb_sj_nest)
+      table_count++;
+  }
   if (loosescan)
   {
     // LooseScan: May use join buffering for all tables after last inner table.
@@ -2778,8 +2783,6 @@ bool Optimize_table_order::semijoin_firs
     no_jbuf_before= (table_count > 1) ? last_tab + 1 : first_tab;
   }
 
-  for (uint i= first_tab; i <= last_tab; i++)
-    remaining_tables|= positions[i].table->table->map;
 
   for (uint i= first_tab; i <= last_tab; i++)
   {

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