Revert patch for bug #19764, which did not work with prepared statements.

mysql-test/r/show_check.result

@@ -630,19 +630,4 @@ SHOW TABLES FROM no_such_database;
 ERROR 42000: Unknown database 'no_such_database'
 SHOW COLUMNS FROM no_such_table;
 ERROR 42S02: Table 'test.no_such_table' doesn't exist
-flush status;
-show status like 'slow_queries';
-Variable_name	Value
-Slow_queries	0
-show tables;
-Tables_in_test
-show status like 'slow_queries';
-Variable_name	Value
-Slow_queries	0
-select 1 from information_schema.tables limit 1;
-1
-1
-show status like 'slow_queries';
-Variable_name	Value
-Slow_queries	1
-End of 5.0 tests.
+End of 5.0 tests

mysql-test/t/show_check-master.opt

---log-slow-queries --log-long-format --log-queries-not-using-indexes

mysql-test/t/show_check.test

@@ -507,16 +507,4 @@ SHOW TABLES FROM no_such_database;
 SHOW COLUMNS FROM no_such_table;
 
 
-#
-# Bug #19764: SHOW commands end up in the slow log as table scans
-#
-flush status;
-show status like 'slow_queries';
-show tables;
-show status like 'slow_queries';
-# Table scan query, to ensure that slow_queries does still get incremented
-# (mysqld is started with --log-queries-not-using-indexes)
-select 1 from information_schema.tables limit 1;
-show status like 'slow_queries';
-
---echo End of 5.0 tests.
+--echo End of 5.0 tests

sql/sql_lex.cc

@@ -173,7 +173,6 @@ void lex_start(THD *thd, uchar *buf,uint length)
   lex->spcont= NULL;
   lex->proc_list.first= 0;
   lex->escape_used= FALSE;
-  lex->is_show_command= FALSE;
   lex->reset_query_tables_list(FALSE);
 
   lex->nest_level=0 ;

sql/sql_lex.h

@@ -1016,13 +1016,6 @@ typedef struct st_lex : public Query_tables_list
   
   bool escape_used;
 
-  /*
-    Prevent SHOW commands from being written to the slow queries log.
-    This is fixed properly in MySQL 5.1, but a quick hack is used in 5.0
-    to achieve the same result.
-  */
-  bool is_show_command;
-
   st_lex();
 
   virtual ~st_lex()

sql/sql_parse.cc

@@ -2150,10 +2150,10 @@ void log_slow_statement(THD *thd)
   thd->end_time();				// Set start time
 
   /*
-    Do not log administrative or SHOW statements unless the appropriate
-    option is set; do not log into slow log if reading from backup.
+    Do not log administrative statements unless the appropriate option is
+    set; do not log into slow log if reading from backup.
   */
-  if (thd->enable_slow_log && !thd->user_time && !thd->lex->is_show_command)
+  if (thd->enable_slow_log && !thd->user_time)
   {
     thd->proc_info="logging slow query";
 

sql/sql_yacc.yy

@@ -6412,7 +6412,6 @@ opt_table_sym:
 show:	SHOW
 	{
 	  LEX *lex=Lex;
-          lex->is_show_command= TRUE;
 	  lex->wild=0;
           lex->lock_option= TL_READ;
           mysql_init_select(lex);