The pilot patch for mwl#253.

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/sql_select.h b/sql/sql_select.h
index 638de926d75..87c09611009 100644
--- a/sql/sql_select.h
+++ b/sql/sql_select.h
@@ -292,6 +292,8 @@ typedef struct st_join_table {
   /* psergey-todo: make the below have type double, like POSITION::records_read? */
   ha_rows       records_read;
   
+  double        cond_selectivity;
+  
   /* Startup cost for execution */
   double        startup_cost;
     
@@ -762,6 +764,8 @@ typedef struct st_position :public Sql_alloc
   */
   double records_read;
 
+  double cond_selectivity;
+
   /* 
     Cost accessing the table in course of the entire complete join execution,
     i.e. cost of one access method use (e.g. 'range' or 'ref' scan ) times 
@@ -1804,6 +1808,8 @@ void eliminate_tables(JOIN *join);
 /* Index Condition Pushdown entry point function */
 void push_index_cond(JOIN_TAB *tab, uint keyno);
 
+#define OPT_LINK_EQUAL_FIELDS    1
+
 /****************************************************************************
   Temporary table support for SQL Runtime
  ***************************************************************************/