prefer to use new flag name when possible

sql/records.cc

@@ -288,7 +288,7 @@ bool init_read_record(READ_RECORD *info,THD *thd, TABLE *table,
   }
   /* Condition pushdown to storage engine */
   if ((table->file->ha_table_flags() &
-       HA_MUST_USE_TABLE_CONDITION_PUSHDOWN) &&
+       HA_CAN_TABLE_CONDITION_PUSHDOWN) &&
       select && select->cond && 
       (select->cond->used_tables() & table->map) &&
       !table->file->pushed_cond)

sql/sql_select.cc

@@ -9570,7 +9570,7 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
           {
             tab->table->file->pushed_cond= NULL;
             if ((tab->table->file->ha_table_flags() &
-                  HA_MUST_USE_TABLE_CONDITION_PUSHDOWN) &&
+                  HA_CAN_TABLE_CONDITION_PUSHDOWN) &&
                 !first_inner_tab)
             {
               COND *push_cond= 
@@ -23630,7 +23630,7 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
         const COND *pushed_cond= tab->table->file->pushed_cond;
 
         if ((tab->table->file->ha_table_flags() &
-              HA_MUST_USE_TABLE_CONDITION_PUSHDOWN) &&
+              HA_CAN_TABLE_CONDITION_PUSHDOWN) &&
             pushed_cond)
         {
           eta->push_extra(ET_USING_WHERE_WITH_PUSHED_CONDITION);

storage/connect/ha_connect.cc

@@ -690,7 +690,7 @@ ulonglong ha_connect::table_flags() const
 //                   HA_NULL_IN_KEY |    not implemented yet
 //                   HA_FAST_KEY_READ |  causes error when sorting (???)
                      HA_NO_TRANSACTIONS | HA_DUPLICATE_KEY_NOT_IN_ORDER |
-                     HA_NO_BLOBS | HA_MUST_USE_TABLE_CONDITION_PUSHDOWN;
+                     HA_NO_BLOBS | HA_CAN_TABLE_CONDITION_PUSHDOWN;
   ha_connect *hp= (ha_connect*)this;
   PTOS        pos= hp->GetTableOptionStruct();
 

storage/sphinx/ha_sphinx.h

@@ -60,7 +60,7 @@ public:
 
 	#if MYSQL_VERSION_ID>50100
 	ulonglong		table_flags () const	{ return HA_CAN_INDEX_BLOBS | 
-                                                                 HA_MUST_USE_TABLE_CONDITION_PUSHDOWN; } ///< bitmap of implemented flags (see handler.h for more info)
+                                                                 HA_CAN_TABLE_CONDITION_PUSHDOWN; } ///< bitmap of implemented flags (see handler.h for more info)
 	#else
 	ulong			table_flags () const	{ return HA_CAN_INDEX_BLOBS; }			///< bitmap of implemented flags (see handler.h for more info)
 	#endif