Generate warning in ha_delete_table() if files is missing in handler

mysql-test/r/myisam.result:
  Test of DROP TABLE when .MYI or .MYD is missing
mysql-test/r/ndb_autodiscover.result:
  Update test results
mysql-test/r/rpl_EE_error.result:
  Change test to conform with new handling of drop table when handler file is missing
mysql-test/t/myisam.test:
  Test of DROP TABLE when .MYI or .MYD is missing
mysql-test/t/rpl_EE_error.test:
  Change test to conform with new handling of drop table when handler file is missing
sql/handler.cc:
  Generate a warning in ha_delete_table() if we get an error from 'delete_table()'
sql/handler.h:
  More parameters to ha_delete_table() so that we can generate better error messages
sql/sql_table.cc:
  Generate warning in ha_delete_table()

mysql-test/r/myisam.result

@@ -1150,3 +1150,15 @@ drop table t1;
 set storage_engine=MyISAM;
 create table t1 (v varchar(65535));
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. You have to change some columns to TEXT or BLOBs
+create table t1 (a int) engine=myisam;
+drop table if exists t1;
+Warnings:
+Error	2	Can't find file: 't1' (errno: 2)
+create table t1 (a int) engine=myisam;
+drop table t1;
+ERROR 42S02: Unknown table 't1'
+create table t1 (a int) engine=myisam;
+drop table t1;
+ERROR HY000: File './test/t1.MYD' not found (Errcode: 2)
+drop table t1;
+ERROR 42S02: Unknown table 't1'

mysql-test/r/ndb_autodiscover.result

@@ -180,7 +180,7 @@ select * from t4;
 ERROR 42S02: Table 'test.t4' doesn't exist
 drop table if exists t4;
 Warnings:
-Note	1051	Unknown table 't4'
+Error	155	Table 'test.t4' doesn't exist
 drop table t5;
 ERROR 42S02: Unknown table 't5'
 drop table if exists t5;

mysql-test/r/rpl_EE_error.result

@@ -6,7 +6,9 @@ drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 start slave;
 create table t1 (a int) engine=myisam;
 flush tables;
-drop table t1;
+drop table if exists t1;
+Warnings:
+Error	2	Can't find file: 't1' (errno: 2)
 create table t1 (a int, unique(a)) engine=myisam;
 set sql_log_bin=0;
 insert into t1 values(2);

mysql-test/t/myisam.test

@@ -539,3 +539,20 @@ eval set storage_engine=$default;
 # MyISAM specific varchar tests
 --error 1118
 create table t1 (v varchar(65535));
+
+#
+# Test how DROP TABLE works if the index or data file doesn't exists
+
+create table t1 (a int) engine=myisam;
+system rm ./var/master-data/test/t1.MYI ;
+drop table if exists t1;
+create table t1 (a int) engine=myisam;
+system rm ./var/master-data/test/t1.MYI ;
+--error 1051
+drop table t1;
+create table t1 (a int) engine=myisam;
+system rm ./var/master-data/test/t1.MYD ;
+--error 1105
+drop table t1;
+--error 1051
+drop table t1;

mysql-test/t/rpl_EE_error.test

@@ -9,7 +9,7 @@ source include/master-slave.inc;
 create table t1 (a int) engine=myisam;
 flush tables;
 system rm ./var/master-data/test/t1.MYI ;
-drop table t1;
+drop table if exists t1;
 save_master_pos;
 connection slave;
 sync_with_master;

sql/handler.cc

@@ -1027,15 +1027,24 @@ bool ha_flush_logs()
   The .frm file will be deleted only if we return 0 or ENOENT
 */
 
-int ha_delete_table(enum db_type table_type, const char *path)
+int ha_delete_table(THD *thd, enum db_type table_type, const char *path,
+                    const char *alias, bool generate_warning)
 {
   handler *file;
   char tmp_path[FN_REFLEN];
+  int error;
+  TABLE dummy_table;
+  TABLE_SHARE dummy_share;
+  DBUG_ENTER("ha_delete_table");
+
+  bzero((char*) &dummy_table, sizeof(dummy_table));
+  bzero((char*) &dummy_share, sizeof(dummy_share));
+  dummy_table.s= &dummy_share;
 
   /* DB_TYPE_UNKNOWN is used in ALTER TABLE when renaming only .frm files */
   if (table_type == DB_TYPE_UNKNOWN ||
-      ! (file=get_new_handler((TABLE*) 0, table_type)))
-    return ENOENT;
+      ! (file=get_new_handler(&dummy_table, table_type)))
+    DBUG_RETURN(ENOENT);
 
   if (lower_case_table_names == 2 && !(file->table_flags() & HA_FILE_BASED))
   {
@@ -1044,9 +1053,45 @@ int ha_delete_table(enum db_type table_type, const char *path)
     my_casedn_str(files_charset_info, tmp_path);
     path= tmp_path;
   }
-  int error=file->delete_table(path);
+  if ((error= file->delete_table(path)) && generate_warning)
+  {
+    /*
+      Because file->print_error() use my_error() to generate the error message
+      we must store the error state in thd, reset it and restore it to
+      be able to get hold of the error message.
+      (We should in the future either rewrite handler::print_error() or make
+      a nice method of this.
+    */
+    bool query_error= thd->query_error;
+    sp_rcontext *spcont= thd->spcont;
+    SELECT_LEX *current_select= thd->lex->current_select;
+    char buff[sizeof(thd->net.last_error)];
+    char new_error[sizeof(thd->net.last_error)];
+    int last_errno= thd->net.last_errno;
+
+    strmake(buff, thd->net.last_error, sizeof(buff)-1);
+    thd->query_error= 0;
+    thd->spcont= 0;
+    thd->lex->current_select= 0;
+    thd->net.last_error[0]= 0;
+
+    /* Fill up strucutures that print_error may need */
+    dummy_table.s->path= path;
+    dummy_table.alias= alias;
+
+    file->print_error(error, 0);
+    strmake(new_error, thd->net.last_error, sizeof(buff)-1);
+
+    /* restore thd */
+    thd->query_error= query_error;
+    thd->spcont= spcont;
+    thd->lex->current_select= current_select;
+    thd->net.last_errno= last_errno;
+    strmake(thd->net.last_error, buff, sizeof(buff)-1);
+    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, error, new_error);
+  }
   delete file;
-  return error;
+  DBUG_RETURN(error);
 }
 
 /****************************************************************************
@@ -1320,7 +1365,16 @@ ulonglong handler::get_auto_increment()
   return nr;
 }
 
-	/* Print error that we got from handler function */
+
+/*
+  Print error that we got from handler function
+
+  NOTE:
+   In case of delete table it's only safe to use the following parts of
+   the 'table' structure:
+     table->s->path
+     table->alias
+*/
 
 void handler::print_error(int error, myf errflag)
 {
@@ -1529,7 +1583,7 @@ int handler::delete_table(const char *name)
 	break;
     }
     else
-      enoent_or_zero= 0;
+      enoent_or_zero= 0;                        // No error for ENOENT
     error= enoent_or_zero;
   }
   return error;

sql/handler.h

@@ -757,7 +757,8 @@ bool ha_flush_logs(void);
 void ha_drop_database(char* path);
 int ha_create_table(const char *name, HA_CREATE_INFO *create_info,
 		    bool update_create_info);
-int ha_delete_table(enum db_type db_type, const char *path);
+int ha_delete_table(THD *thd, enum db_type db_type, const char *path,
+                    const char *alias, bool generate_warning);
 
 /* discovery */
 int ha_create_table_from_engine(THD* thd, const char *db, const char *name,

sql/sql_table.cc

@@ -109,11 +109,12 @@ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists,
  delete (drop) tables.
 
   SYNOPSIS
-   mysql_rm_table_part2_with_lock()
-   thd			Thread handle
-   tables		List of tables to delete
-   if_exists		If 1, don't give error if one table doesn't exists
-   dont_log_query	Don't write query to log files
+    mysql_rm_table_part2_with_lock()
+    thd			Thread handle
+    tables		List of tables to delete
+    if_exists		If 1, don't give error if one table doesn't exists
+    dont_log_query	Don't write query to log files. This will also not
+			generate warnings if the handler files doesn't exists  
 
  NOTES
    Works like documented in mysql_rm_table(), but don't check
@@ -157,7 +158,8 @@ int mysql_rm_table_part2_with_lock(THD *thd,
 			In this case we give an warning of level 'NOTE'
     drop_temporary	Only drop temporary tables
     drop_view		Allow to delete VIEW .frm
-    dont_log_query	Don't log the query
+    dont_log_query	Don't write query to log files. This will also not
+			generate warnings if the handler files doesn't exists  
 
   TODO:
     When logging to the binary log, we should log
@@ -234,16 +236,10 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
       char *end;
       db_type table_type= get_table_type(path);
       *(end=fn_ext(path))=0;			// Remove extension for delete
-      error=ha_delete_table(table_type, path);
+      error= ha_delete_table(thd, table_type, path, table->table_name,
+                             !dont_log_query);
       if ((error == ENOENT || error == HA_ERR_NO_SUCH_TABLE) && if_exists)
-      {
-        /* Warn that the table did not exist in engine */
-        if (error == HA_ERR_NO_SUCH_TABLE)
-          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
-                              ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR),
-                              table->table_name);
 	error= 0;
-      }
       if (error == HA_ERR_ROW_IS_REFERENCED)
       {
 	/* the table is referenced by a foreign key constraint */
@@ -306,7 +302,7 @@ int quick_rm_table(enum db_type base,const char *db,
     error=1; /* purecov: inspected */
   my_snprintf(path, sizeof(path), "%s/%s/%s", mysql_data_home, db, table_name);
   unpack_filename(path,path);
-  return ha_delete_table(base,path) || error;
+  return ha_delete_table(current_thd, base, path, table_name, 0) || error;
 }
 
 /*