Fix for bug#7212: information_schema: "Can't find file" errors if storage engine gone(after review)

mysql-test/r/information_schema.result

@@ -590,3 +590,28 @@ TABLES
 TABLE_PRIVILEGES
 TABLE_CONSTRAINTS
 TABLE_NAMES
+use test;
+create function sub1(i int) returns int
+return i+1;
+create table t1(f1 int);
+create view t2 (c) as select f1 from t1;
+create view t3 (c) as select sub1(1);
+create table t4(f1 int, KEY f1_key (f1));
+drop table t1;
+drop function sub1;
+select column_name from information_schema.columns
+where table_schema='test';
+column_name
+f1
+Warnings:
+Warning	1356	View 'test.t2' references invalid table(s) or column(s) or function(s)
+Warning	1356	View 'test.t3' references invalid table(s) or column(s) or function(s)
+select index_name from information_schema.statistics where table_schema='test';
+index_name
+f1_key
+select constraint_name from information_schema.table_constraints
+where table_schema='test';
+constraint_name
+drop view t2;
+drop view t3;
+drop table t4;

mysql-test/r/view.result

@@ -983,10 +983,10 @@ create view v1 as select * from t1;
 drop table t1;
 create table t1 (col1 char(5),newcol2 char(5));
 insert into v1 values('a','aa');
-ERROR HY000: View 'test.v1' references invalid table(s) or column(s)
+ERROR HY000: View 'test.v1' references invalid table(s) or column(s) or function(s)
 drop table t1;
 select * from v1;
-ERROR HY000: View 'test.v1' references invalid table(s) or column(s)
+ERROR HY000: View 'test.v1' references invalid table(s) or column(s) or function(s)
 drop view v1;
 create view v1 (a,a) as select 'a','a';
 ERROR 42S21: Duplicate column name 'a'
@@ -1217,11 +1217,11 @@ create table t1 (s1 int);
 create view v1 as select x1() from t1;
 drop function x1;
 select * from v1;
-ERROR 42000: FUNCTION test.x1 does not exist
+ERROR HY000: View 'test.v1' references invalid table(s) or column(s) or function(s)
 show table status;
 Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
 t1	MyISAM	9	Fixed	0	0	0	21474836479	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
-v1	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	#	#	NULL	NULL	NULL	NULL	FUNCTION test.x1 does not exist
+v1	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	#	#	NULL	NULL	NULL	NULL	View 'test.v1' references invalid table(s) or column(s) or function(s)
 drop view v1;
 drop table t1;
 create view v1 as select 99999999999999999999999999999999999999999999999999999 as col1;
@@ -1655,7 +1655,7 @@ test.t1	check	status	OK
 drop table t1;
 check table v1;
 Table	Op	Msg_type	Msg_text
-test.v1	check	error	View 'test.v1' references invalid table(s) or column(s)
+test.v1	check	error	View 'test.v1' references invalid table(s) or column(s) or function(s)
 drop view v1;
 create table t1 (a int);
 create table t2 (a int);

mysql-test/t/information_schema.test

@@ -292,3 +292,24 @@ use test;
 show tables;
 use information_schema;
 show tables like "T%";
+
+#
+# Bug#7212: information_schema: "Can't find file" errors if storage engine gone
+#
+use test;
+create function sub1(i int) returns int
+  return i+1;
+create table t1(f1 int);
+create view t2 (c) as select f1 from t1;
+create view t3 (c) as select sub1(1);
+create table t4(f1 int, KEY f1_key (f1));
+drop table t1;
+drop function sub1;
+select column_name from information_schema.columns
+where table_schema='test';
+select index_name from information_schema.statistics where table_schema='test';
+select constraint_name from information_schema.table_constraints
+where table_schema='test';
+drop view t2;
+drop view t3;
+drop table t4;

mysql-test/t/view.test

@@ -1169,7 +1169,7 @@ create function x1 () returns int return 5;
 create table t1 (s1 int);
 create view v1 as select x1() from t1;
 drop function x1;
--- error 1305
+-- error 1356
 select * from v1;
 --replace_column 12 # 13 #
 --replace_result "2147483647	" "21474836479	"

sql/share/errmsg.txt

@@ -5464,7 +5464,7 @@ ER_WARN_VIEW_WITHOUT_KEY
 	serbian "View '%-.64s.%-.64s' references invalid table(s) or column(s)"
 	ukr "View,  ,  ͦ   æ(),  Ҧ  "
 ER_VIEW_INVALID  
-	eng "View '%-.64s.%-.64s' references invalid table(s) or column(s)"
+	eng "View '%-.64s.%-.64s' references invalid table(s) or column(s) or function(s)"
 	rus "View '%-.64s.%-.64s'      "
 	serbian "Can't drop a %s from within another stored routine"
 	ukr "View '%-.64s.%-.64s'   Ŧަ æ  æ"

sql/sql_derived.cc

@@ -140,6 +140,18 @@ int mysql_derived_prepare(THD *thd, LEX *lex, TABLE_LIST *orig_table_list)
     derived_result->set_table(table);
 
 exit:
+    /* Hide "Unknown column" or "Unknown function" error */
+    if (orig_table_list->view)
+    {
+      if (thd->net.last_errno == ER_BAD_FIELD_ERROR ||
+          thd->net.last_errno == ER_SP_DOES_NOT_EXIST)
+      {
+        thd->clear_error();
+        my_error(ER_VIEW_INVALID, MYF(0), orig_table_list->db,
+                 orig_table_list->real_name);
+      }
+    }
+
     /*
       if it is preparation PS only or commands that need only VIEW structure
       then we do not need real data and we can skip execution (and parameters

sql/sql_show.cc

@@ -2374,12 +2374,24 @@ static int get_schema_column_record(THD *thd, struct st_table_list *tables,
 				    const char *file_name)
 {
   TIME time;
-  const char *wild= thd->lex->wild ? thd->lex->wild->ptr() : NullS;
+  LEX *lex= thd->lex;
+  const char *wild= lex->wild ? lex->wild->ptr() : NullS;
   CHARSET_INFO *cs= system_charset_info;
   DBUG_ENTER("get_schema_column_record");
   if (res)
   {
-    DBUG_RETURN(1);
+    if (lex->orig_sql_command != SQLCOM_SHOW_FIELDS)
+    {
+      /*
+        I.e. we are in SELECT FROM INFORMATION_SCHEMA.COLUMS
+        rather than in SHOW COLUMNS
+      */ 
+      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                   thd->net.last_errno, thd->net.last_error);
+      thd->clear_error();
+      res= 0;
+    }
+    DBUG_RETURN(res);
   }
 
   TABLE *show_table= tables->table;
@@ -2745,7 +2757,23 @@ static int get_schema_stat_record(THD *thd, struct st_table_list *tables,
 {
   CHARSET_INFO *cs= system_charset_info;
   DBUG_ENTER("get_schema_stat_record");
-  if (!res && !tables->view)
+  if (res)
+  {
+    if (thd->lex->orig_sql_command != SQLCOM_SHOW_KEYS)
+    {
+      /*
+        I.e. we are in SELECT FROM INFORMATION_SCHEMA.STATISTICS
+        rather than in SHOW KEYS
+      */ 
+      if (!tables->view)
+        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                     thd->net.last_errno, thd->net.last_error);
+      thd->clear_error();
+      res= 0;
+    }
+    DBUG_RETURN(res);
+  }
+  else if (!tables->view)
   {
     TABLE *show_table= tables->table;
     KEY *key_info=show_table->key_info;
@@ -2868,7 +2896,15 @@ static int get_schema_constraints_record(THD *thd, struct st_table_list *tables,
 					 const char *file_name)
 {
   DBUG_ENTER("get_schema_constraints_record");
-  if (!res && !tables->view)
+  if (res)
+  {
+    if (!tables->view)
+      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                   thd->net.last_errno, thd->net.last_error);
+    thd->clear_error();
+    DBUG_RETURN(0);
+  }
+  else if (!tables->view)
   {
     List<FOREIGN_KEY_INFO> f_key_list;
     TABLE *show_table= tables->table;
@@ -2925,7 +2961,15 @@ static int get_schema_key_column_usage_record(THD *thd,
 {
   DBUG_ENTER("get_schema_key_column_usage_record");
   CHARSET_INFO *cs= system_charset_info;
-  if (!res && !tables->view)
+  if (res)
+  {
+    if (!tables->view)
+      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                   thd->net.last_errno, thd->net.last_error);
+    thd->clear_error();
+    DBUG_RETURN(0);
+  }
+  else if (!tables->view)
   {
     List<FOREIGN_KEY_INFO> f_key_list;
     TABLE *show_table= tables->table;

sql/table.cc

@@ -1845,8 +1845,9 @@ ok:
   DBUG_RETURN(0);
 
 err:
-  /* Hide "Unknown column" error */
-  if (thd->net.last_errno == ER_BAD_FIELD_ERROR)
+  /* Hide "Unknown column" or "Unknown function" error */
+  if (thd->net.last_errno == ER_BAD_FIELD_ERROR ||
+      thd->net.last_errno == ER_SP_DOES_NOT_EXIST)
   {
     thd->clear_error();
     my_error(ER_VIEW_INVALID, MYF(0), view_db.str, view_name.str);